最新刊期
卷 22 ， 期 4 ， 2001
- 摘要：The indices reflecting the origin of parent materials in organic matter types can not completely represent hydrocarbon generation ability.However,many geochemical indices indicate that the hydrocarbon potential of the epicontinental marine carbonate rocks is rather low.The ratioes of H/C and O/C of kerogens in these carbonate rocks are plotted in the area of type Ⅲ kerogens in the van Krevelen chart.The H/C ratio of kerogen in carbonate rocks is much lower than that in the neighboring mudstone.Maceral observation also indicates the poor hydrocarbon generation potential of OM in epicontinental carbonate rocks,including the converting of amorphous liptinite to micrinite,the occurrence of blakc structures in the center of algainite and large amount of maceral alike to vitrinite.The distribution of organic facies can explain the transformation of the OM in these carbonate rocks by oxidizing condition.The hydrocarbon generation potential of the sapropelic OM in the epicontinental carbonates is only equivalent to that of type Ⅲ kerogen .When studying the hydrocarbon generating amount of this type of carbonate rocks in basin simulation,they should not be represented by the low mature marls with high TOC and high hydrocarbon index.关键词：carbonate rock;organic facies;type of organic matter;organic carbon;hydrocarbon generation potential650|451|0更新时间：2023-05-30
- 摘要：Paleo morphology resulted from tectonic movement controlled the sequence formation and development of continental basins,especially of rift basins.In the early spreading stage of a rift basin,incised channel fillings and fan deltas developed in front of uplifts;shallow lake bars or bioclastic banks developed on locally uplifted subaqueous platform.In the early middle spreading stage,base level rose,the uplifts turned to be the main provenances,three types of break in slopes developed on the basin margin,which resulted in three types of depositional systems.Nearshore subaqueous fan system resulted from faulted scarp type break in slope;slope fans system developed on faulted terrace type break in slope;fan deltas and sub lake fan system developed on steep slope type break in slope.In base level falling stage,the rift basin was gradually filled by fan deltas and fluvial delta systems.关键词：paleo morphology;base level;stratigraphic sequence;break in slope;Bozhong Depression738|694|0更新时间：2023-05-30
- 摘要：Kuqa rejuvenated foreland basin is located along the northern margin of Tarim Basin.The characteristics of sedimentation and structures are of typical foreland basin.The hydrocarbon source rocks of Triassic Jurassic and reservoir cap rock assemblages developed well in the basin,and it is one of the important exploration areas.It has been demonstrated by study that:1.the matching of faulting time and hydrocarbon generation and expulsion phase is the key of the fault sealing ability;2.fault related fold is the most favorable structural trap;3.break through faults mainly destroied or reformed hydrocarbon reservoir;4.the lacking of conductive structures is the key of the defeat of deep exploration.Based on the relationship between structures and hydrocarbon accumulation,the northern anticline hydrocarbon accumulation zones and the northern anticline of Baicheng Yangxia syncline hydrocarbon accumulation zones are most favorable exploration targets at present.关键词：rejuvenated foreland basin;foreland thrust belt;structure and hydrocarbon;exploration target;Kuqa715|430|0更新时间：2023-05-30
- 摘要：According to sequence stratigraphic study,two sets of incised valley can be identified from Hetaoyuan Formation in the Southeast of Biyang Depression.The incised valley is clearly different from the around redbeds and marsh deposits on seismic profile,contains mainly conglomeratic coarse sandstone with abnormal high Sr,P and Mn2+ contents.This suggests that there had been a sudden change between the valley and the basement stratum.The valley is only found in Sungan Xiaermen area on the north slope of the depression,and distributed vertically in the lowstand system tract of sequencesⅡ and Ⅲ. The sedimentary characteristics and the filling manner are favourable for the formation of various concealed traps.关键词：Biyang Depression;Hetaoyuan Formation;incised valley;sequence boundary;initial flooding surface;concealed trap839|717|0更新时间：2023-05-30
- 摘要：The water out reservoirs of Changqing Gasfields are mainly distributed in Ma 51 submember.The reservoirs could be divided into water producing,water gas producing and gas producing types.The formation water of the reservoirs appeared to be lenticular discontinuous water bodies,but actually there is no boundary between gas and water,no fringe water and bottom water.20 water enriched areas could be found through lateral formation water tracing by using well log and seismic data.It is considered that the water of gas wells in large gas bearing areas would not influence gas producing;in marginal positions of water enriched areas,it is necessary to control producing pressure drop(<3 MPa)or to dewater so as to restart production.关键词：Ma 51reservoir;relative waterenriched area;flowable formation water;exploitation;Changqing Gasfields709|761|0更新时间：2023-05-30
- 摘要：Stratigraphic sequence,rock assemblage,palaeontologic species and sedimentary facies of Palaeozoic Era in Keping region bear comparison with Bachu region.It indicates that Keping and Bachu uplifts were connected in preMesozoic.They were a part of Tarim Basin.Embryonic form of KepingBachu uplift formed in Mesozoic.Mesozoic sediment was lacunae in Keping region.The region was effected by the accretion of southern margin of Eurasian Plate,far distance effect of plate collision and orogeny of southwest Tianshan Mauntains in Cenozoic.Keping thrust belt was formed along Kepingtage Shajingzi fault.Keping uplift constituted the upper thrust nappe of the thrust belt,the northwest extension part of Bachu uplift constituted the underlying structural layer of the thrust belt.It is possible to find oil and gas pools of thrust fault covered trap type and traction fold type.关键词：structural attribute;thrust nappe;Keping faulted uplift724|778|0更新时间：2023-05-30
- 摘要：The value of δ13C1 of coal bed gas in Shanxi and Taiyuan Formations in Qinshui Basin is between-2.963%～-3.539%,which is clearly lower than the δ13C1 value(-2.701%) of simulation test and that calculated by empirical formula.The gas is thus considered to be secondary coal bed gas.The contents of methane in coal bed gas in the study area is more than 98%,and there is no exchange of methane and CO2 isotope,the preservation condition is good.So it is suggested that desorption diffusion migration shuld be the real origin of the secondary coal bed gas in the study area.关键词：coal bed gas;origin;δ13C1;secondary action;Jingcheng area816|599|0更新时间：2023-05-30
- 摘要：Metamorphic reservoir fractures in low buried hill in the west part of Jing'anpu,Damintun Depression are primarily high angle fractures.The evolution of the fractures underwent Late Mesozoicearly and middle Early Tertiary forming stage and the late Early Tertiary forming stage.Since matrix porosity of the reservoirs is only 1%～5%,and the permeability is 1×10-3 μm2,tectonic fractures are the main reservoir spaces and migration paths of the metamorphic reservoirs.The formation of the fractures was affected by lithologic features,faults,burial depth and paleoaeolation.In general,the reservoir property of weathered zones in the buried hill may be not so good.关键词：buried hill;metamorphic rock;fracture;physical property;influence factor713|922|0更新时间：2023-05-30
- 摘要：The comprehensive interpretation of 6 deep seismic sections of 1 354.6 km long and 15 s deep has revealed the important geological characteristics of strata,intrusive mass and tectonics in deep Songliao Basin.The interpretation results indicate that Songliao Basin consists of upper curst layer and lower crust layer,the boundary between the two layers is on the top of network of reflecting horizon.According to the amplitude of vibration,wave group continuity and forms of seismic waves reflected on the 6 sections,the Meso Cenozoic,Upper Paleozoic,Predevonian,Precambrian,intrusive mass and the basic magma basement could be identified.Especially the special geological body of igneous rock-the mantle thermal diapir found in deep crust layer bears close relation to gas distribution.It is an important evidence of searching for inorganic natural gas.It has been proved that the deviation mirror image between moho swell and the basin's depressed center,the listric faults and detaching zones developed in the basin are all resulted from simple shear action.关键词：Songliao Basin;deep seated structures;seismic exploration;tenacious shacer zone;mantle thermal diapir798|841|0更新时间：2023-05-30
- 摘要：According to geological survey,well log,seismic information and rock assemblages combined with the interpretation of log and seimic information,Shiwu Dehui region in Songliao Basin could be divided into four types of sedimentary systems such as alluvial fan system,fluvial delta system,subaqueous fan fan delta and lacustrine systems and nine kinds of sedimentary facies and a number of subfacies.The study shows that different sedimentary systems developed in different developing stages of the basin.Alluvial fan facies developed in the initial fault depressed stage;lacustrine and subaqueous fan fan delta systems developed in the early middle fault depressed stage.In the lacustrine system,deep semideep lacustrine facies and subaqueous gravity flow facies developed well,in the late peried of faulted depression,water depth was shallower,the dominant deposits were those of shallow lake and fluvial delta facies.Two major water transgressive and regressive cycles formed in depression stage can be recognized.The Quantou Formation and Yaojia Formation are mainly of fluvial and shallow lake deposits while lacustrine system is the dominant facies of Qingshankou and Nunjiang Formations.关键词：feature of sedimentary facies;sedimentary system;Shiwu-Dehui region;Songliao Basin734|545|0更新时间：2023-05-30
- 摘要：Take the Upper Triassic regional erosion surface as sequence boundary,the Jurassic and Triassic terrigenous clastic systems in Yanchang oil province could be divided into upper sequence and lower sequence.The lower sequence (Upper Triassic)is composed of a transgressive system tract(TST)and a highstand system tract(HST).The Upper sequence (Juassic)includes a lowstand system tract(LST)overlain by a transgressive system tract(TST)and a highstand system tract(HST).Three assemblage types can be distinguished according to the disposal relationship of source reservoir cap rock assemblage:1.lithologic reservoirs,characterized by source rocks in the lower part and reservoirs in the upper part,formed during rapid subsidence with high accommodation space.The Chang 7 lacustrine facies and Chang 6 deltaic facies in the lower part of the Lower sequence are the best oil reservoir dispose;2.lithologic structural reservoirs with source rocks in the upper part and reservoirs in the lower part,and self sourced reservoirs developed in the upper part of the lower sequence represented by Chang 2+3 and Chang 1 meandering/anastomosing system. It is the second excellent oil reservoir dispose in the study area.3.structural lithologic reservoirs with source rocks in the lower part and reservoirs in the upper part associated with self sourced reservoirs developed in the upper sequence of fluvial facies(Yan 10-Yan 1 submembers).The hydrocarbon pool forming in reservoirs needs good structural trap due to poor lateral seals.关键词：Jurassic Upper Triassic;continental sequence stratigraphy;source reservoir cap rock assemblage;Yanchang oil province837|520|0更新时间：2023-05-30
- 摘要：The Carboniferous System in Hetian River Gasfield was mainly formed of a set of interbedded clastic rocks,carbonate rocks as well as interbedded gypsum,mixed plateform shore clastic and shelf facies.The mixed plateform could be divided into tidal,limited plateform,beach,open plateform subfiacies.When the beach existed,all the subfacies would occur from the shore to sea direction;in reverse,the limited plateform and intraplateform subfacies would absent.But in early Carboniferous,it was formed by clastic shore shelf deposits.Carboniferous System in the area underwent the evolution of shore shelf to mixed plateform resulted from the middle late Hercynian tectonic movement,showing a large scale of ingression regression cycle from Bachu,Karashayi stages to Xiaohaizi stage in the Carboniferous Period.关键词：sedimentary facies;shore shelf;mixed platform;evolution;Carboniferous System;Hetian River Gasfield724|680|0更新时间：2023-05-30
- 摘要：Different paleo uplifts in Sichuan Basin formed in differnt geological ages.The uplifts formed in Caledonian period are complicated in distribution;the one formed in Hercynian Indosinian period is Kaijiang inherited paleo uplift;Luzhou paleo uplift formed in Indo sinian is the front zone of west Sichuan foreland basin;the Jiangyou Mianzhu and Daxing Uplifts extened towards depression.These uplifts did not only reformed reservoir property,their traps also provided the site for hydrocarbon accumulation in the early stage,and favourable for oil and gas pool forming.So it is suggested that the paleo uplifts in Sichuan Basin are important realms for oil and gas exploration.关键词：paleo uplift;initial hydrocarbon accumulation;Caledonian movement;Yenshan movement;Indo sinian movement;Sichuan Basin728|663|0更新时间：2023-05-30
- 摘要：The contents of mercury(Hg) in natural gases can vary from less than 1 to n×103 μm/m3.The main affecting factors are the types of the parent matter,the tectonic background and deep geological process.The content of Hg in coal type gas generated from typeⅢorganic matter is relatively higher.On the contrary,that of oil type gas generated from type Ⅰto Ⅱorganic matter is relatively lower.So the concentration of Hg in natural gas is regarded as geochemical index in determining the source rock of the gas.Research result shows that the concentration of Hg in natural gas is affectde by tectonic movement of basins and deep geological process.The contents of Hg in the natural gases from tensile active basins located in East China is relatively higher;that of natural gases from stable basins in Central China is relatively lower;that of natural gases from sub stale basins in Northwest China is between the above mentioned two.This variation of Hg contents in oil type gas is particularly considerable.The Hg contents in natural gas bear positive correlation with the 3He/4He ratio,indicating that Hg may be partly originated from deep earth degassing or be affected by deep geological action.关键词：Hg;type of parent matter;tectonic setting;deep geological process;He isotope722|766|0更新时间：2023-05-30
- 摘要：The forward modeling result of waterflood seismic monitoring of Pu 1 group sandstone reservoir in Daqing Oilfields shows that different reservoirs have different demands for visual resolution and visual signal to noise ratio of seismic data used in reservoir monitoring.Comparing with thick reservoirs of the same lithological property,thin reservoirs and thin interbedded reservoirs demand higher visual resolution and visual signal to noise ratio.Monitoring fluid performance variation of each bed in thin interbedded reservoirs must improve the resolution and the visual S/N ratio of different seismic profile.The product of the visual resolution an isual S/N ratio can be used in the feasible quantitative analysis of time lapse seismonitoring.关键词：reservoir characteristics;time lapse seism;forward modeling;visual resolution;visual signal to noise ratio;Daqing oilfield1217|450|0更新时间：2023-05-30
- 摘要：Oil pools in Zhongyuan Oilfields are typical high temperature and high salinity (temperature:60℃～130℃;brine salinity 6×104～32×104 mg/L)pools.41 bacterial populations were selected from 140 formation water samples by using HUNGATE technique.Most of the bacteria are bacilli form,some of them have gemmae.The most favourable temperature for the cultured bacteria is within 60℃～80℃,the abundance of the bacteria decreases with the increasing of salinity.The main metabolic products are organic acid and alcoho which could increase reservoir permeability,improve oil water boundary and considerably increase recovery percent.The result of laboratory test of Wen-15 block in Zhongyuan Oilfields indicates that the oil recovery factor could be increased by 6% or more.The test made in well site had also got fine result,input ouput ratio is 1:4.1.关键词：microbia;genus of bacteria;oil recovery;Zhongyuan Oilfield771|790|0更新时间：2023-05-30
- 摘要：According to its 13 lithologic microfacies,14 lithologic facies,7 sedimentary microfacies and the characteristics of 9 mudstone layers formed in lake transgression,Chang 6 member in Jing'an Oilfield could be divided into one parasequence series(PSS),3 parasequences (PS1,PS2,PS3).In PS1,the sedimentary microfacies varies from shallow lake or prodeltaic facies-frontal deltaic facies to subaqueous distributary channel facies,or from interbranch channel facies to deltaic plain distributary channel facies in ascendind order,reflecting lake transgression regression process.In PS2,the microfacies varies from prodeltaic deltaic front facies to distal bar-river mouth bar facies and then subaqueous distributary channel facies,reflecting the parasequence development process of water getting shallower and shallower.ndistributarychannelfaciesina关键词：Jing'an Oilfeld;Chang 6 Member;lithologic microfacies;lithofacies;single well facies;sequence stratigraphy693|581|0更新时间：2023-05-30
- 摘要：The Ordovician reservoir types of Qianmiqiao buried hill could be divided into 4 types:1.pore cave reservoir;2.fracture reservoir;3.pore cave fracture complex reservoir;4.pore reservoir.The pore cave fracture complex reservoir type is the major reservoir space type and most favourable for hydrocarbon migration and accumulation.The reservoirs are characterized by zonal distribution both vertically and horizentally.In vertical of the 4 zones,the 2nd and 3rd zones are favourable for hydrocarbon accumulation;in horizontal,residual dome is more favourable for reservoir development.The corroded pores and caves formed in Caledomian-earhy Hercynian and their formation was controlled by the characteristics of rock and water,tectonic movement,palaeoclamite and fractures;the formation of the fractures in Indo Chinese and early Yenshan epoches was controlled by tectonic movement,rock characteristics and burial depth.The Indosimian movement early Yenshan movement resulted in large amounts of fractures and recorroded pores in Ordovician reservoirs;the middle late Yenshan movement resulted in serious filling;the Himalayan movement reduced the pore spaces.关键词：Qianmiqao buried hill;Ordovician reservoir;reservoir type;distribution characteristics;formation mechanism;reform action723|503|0更新时间：2023-05-30
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RESERVIOR CHARACTERISTICS OF LOW PERMEABLE SANDSTONES IN DEEP LEVEL FROM ANPENG AREA,ZHAOAO OILFIELD
摘要：Anpeng deep strata series are usually buried deeper than 3 000 m,and belong to the lower part of the third member of Hetaoyuan Formation fan delta sedimentary system.The difference of sedimentary environment resulted in serious heterogeneity of the sandstone reservoirs.Core descriptions,conventional thin section,injecting thin sections,SEM observations,X-ray analysis of clay minerals,mercury injection data and pattern analysis of pore structures show that the major rock types are lithic sandstone,feldspathic litharenite and lithic arkose.Also it is found that,in the sandstone,the subaqueous distributary channel sandbodies and the mouth bar sandbodies have the best physical properties.Rapid accumulation,miscellaneous grain size,low maturity of texture and composition are the predetermination condition of low permeability.The main type of pores is the secondary porosity.The reservois are poor in pore throat distribution,complex in structure,small in throat and their evident character is heterogeneity.They are the typical compacted low permeable reservoirs.The diagenesis,especially the compaction and the later carbonate cementation are the key factors affecting the microheterogeneity of the reservoirs and leading the reservoirs to be compacted and low permeable.关键词：sandstone reservoir;characteristics;pore structure;diagenesis;deep sequence;Biyang Depression684|622|0更新时间：2023-05-30 - 摘要：Based on field information,the reservoirs,which are suitable to cold recovery,are those whose formation are loose,gravel content is low,dead oil viscosity is 500～50 000 mPa.s,solution gas concentration in crude oil is about 10 m3/t,reservoir pressure is higher than 2 MPa,formation depth is 200～1 000 m.The effects of edge water and gas cap distribution on cold recovery of heavy oil are great,which are important factors to deploy oil wells and determine perforation interval and discharge capacity.This techique has extensive adaptability in such reservoirs as loose sandstone with solution gas.It is very important for the deployment of this technique to make clear the effects of geologic factors on cold recovery and establish relevant technical tactics.关键词：heavy oil;cold recovery;wormhole;foamy oil939|878|0更新时间：2023-05-30
- 摘要：The strong Himalayan movement significantly affected hydrocarbon migration and accumulation of Turpan Hami Basin.Its influences include:1.resulting in compressional stress drived primary migration of coal formed oil;2.changing the fluid dynamic conditions,the pathways and the manners of hydrocarbon secondary migration,resulting in hydrocarbon interlayer cross migration;3.causing the fall of oil water boundary,filling degrees of traps;4.adjusting and reforming paleo pools to form secondary hydrocarbon pools.关键词：Himalayan movement;hydrocarbon migration;Turpan-Hami Basin;oil water boundary;secondary oil and gas pool713|604|0更新时间：2023-05-30
- 摘要：After nearly 20 years of production,the water cut of the oil pool in the lower Sha 2 submember is up to 92.3%.The distribution of residual oil is influenced basically by structures,sedimentary facies and well density,and could be divided into 3 types:(1)discontinuous oil layers.This type of residual oil is mainly distributed in interchannel facies(Q),distal bar and sand flat facies(Y).The oil layers should be reformed before recovery;(2)incompleted injection recovery type.This type of residual oil is mainly distriuted in the 6th～8th sandbodies of lower Sha 2 submember,and it is not suitable for recovery at present;(3)fault sheltered type.This type of residual oil is distributed in the upper walls of Pu 46, 49, 25 and 14 faults,and could be recovered by directional well allocation.关键词：residual oil;type;distribution;exploration;Pucheng Oilfield737|550|0更新时间：2023-05-30
- 摘要：The processing method of combining well log constrained seismic trace inversion with polynomial fitting technique was used to improve the resolution factor of seismic records.The purpose was to make full use of the ready information of well log,geological and seismic data to constrain seismic trace inversion so as to obtain an opproximate reflectivity sequence section with higher resolution factor and wider band,and then use lateral polynomial fitting technique to process the section.This method does not only improve the resolution factor of seismic records,but also the signal/noise ratio of the records.This method was used to process some seismic data of a certain area,the result was evident.关键词：井约束;地震道反演;分辨率和信噪比;多项式拟合676|802|0更新时间：2023-05-30
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