最新刊期
卷 7 ， 期 2 ， 1986
- 摘要：Yushan-Kume fault belt,situated along Yushan Archipelago of Eastern Zhejiang coast and Kume Islands in the west side of Kyukyu Archipelago,across the central part of East China Sea the strike direction of 300-305?,more than 1000km long and 100km wide,consists of three factures of Yushan-Kume,Yuzhong-Niaodao and Taohua-Suguo.It shows a relative high value zone on both gravity and magnetic maps,and a horst structure on a seismic profile section,the dip angle of which are about 70-80皌o NNE and SSW,the fault throw about 540-2260m respectively.The sea bottom topography in Okinawa Trough presents a uplift towards NWW.The belt is considered to be a normal anticlockwise fault with its north block moved westwards and south block eastwards,the offset distance is about 5-50km.The distribution of basalts can be found on the west part of the belt,showing that the belt has deeply cut the earth crust.The belt is huge to the west,which expands to the northeast of Zhejiang,passing through Kyukyu Trench to Okidaito Isiands of the west Pacific Ocean.The belt has been intensely activating since its formation in Cretaceous.The formation and development of wich is a result of the underthrusting of the Pacific Plate towards Eurasia Plate,and the creeping of Chinese Continental margin continously eastwards.It has played a role of dividing structural features of East China Sea into south and north sea area.The geophysical fields,sea floor features,Cenozoic sediments,major structural direc-tions,reginal structures,fault characteristics,volcanicities,the value of thermal flow in the sea floor and Moho depth within the south and north part of East China Sea are distinctly different.603|453|0更新时间：2023-05-30
- 摘要：In recent years,high-yield reservoir rocks of cave-accumulated type have been found by drilling some wells in the weathered leaching zone of Lower Palaeozoic in Jiyang depression,Shandong,of which No.10 well in Gubei in particular.The cave accumulations were formed in the Jurassic,the basement rock of the cave is carbonate one to the Majiagou group of Middle Ordovician.The cave is 10.08 metres high,the accumulation is 8.28 metres thick and unfilled cave space remains in 1.8 metres high.The cave accumulations are in disorder,which consist of three components:1)collapsed materials(breakdowns)of the basement rock forming the cave;2)destructive products in chemical sediments of the cave;3)materials from other places in the stage of the formation or post-formation of the cave.Cave accumulations in Gubei No.10 well,from down to up,can be divided into four lithologic formations of cave breccia,cave mudstone,cave mudstone-breccia and cave broken stone,etc.Mesozoic sporopollen fossils were contained and found in the cave mudstone,which may have given evidence for the determination of the time for the accumulation of the cave.Cave accumulations,avoiding the normal pressure because of protecting by the cave wall,have preserved a great many porosities in them.Because the finer accumulations,the higher percentage of primitive porosity,thus,porosity of the cave mudstone is the best,microporosity mainly,up to 37.9%.Cave accumulations in Jiyang depression,from the Early Carboniferous onwards,have been successively buried.Porosities and corrosional corridors of the cave have been enlarged and increased by the corrosion of acid water solusions from the movement of the Tertiary fault zone and through the unconformable structural zone after their buring,thus,improving permeability of the cave accumulations and making them a good high-yield reservoir rock.580|421|0更新时间：2023-05-30
- 摘要："六五"期间我国石油、天然气勘探全面完成和超额完成了国家计划,油气勘探取得了重大进展,主要表现在以下几个方面:一、石油、天然气储量有了大幅度的增长1981至1985年,全国新发现油田78个。新增石油储量是"五五"期间的一倍半,是"四五"期间的两倍多。平均年储量增长速度达到7.1%,已超过原油产量增长速度的一倍。改变了前几年一度出现的储量增长赶不上产量增长的状况。636|434|0更新时间：2023-05-30
- 摘要：The origin of overthrust faults widely distributed between basins and folded mountain ranges in the west and central part of China has been explained by Luo Zhili in the theory of buried subduction.It is believed that these overthrust faults were normal ones which controlled half graben-like basins in their earlier stage.The filling of the thickest terrestrial sediments in the mountain front depressions later,and the buried subduction along sliding layer slopes of the buried muddy rocks type by gravity force that have made the surface of earlier normal faults above mentioned overturn and then become overthrust faults.Therefore,it is impossible for the newly-deposited soft formation to subduct toward the well-consolidated and folded mountain ranges.These overthrust faults,with the exception of a few from gravitation gliding structure,have resulted mainly from the process of lateral shear stress of vertical flexural fold,namely,multiple folds and compressed basins,which then can be attributed to the group of fan overthrust fault.The distribution and development of lateral shear stress within vertical flexural folds in both space and time has been studied in the concept of vertical flexural rod of material mechanics.The results from calculating in theory show that the maximum value of the vertical shear stress within the flanks of vertical folds is much stronger than that of the horizontal shear stress,as 3 times as that of later.626|370|0更新时间：2023-05-30
- 摘要：Based on the statistical analysis of the geochemical data of more than 192 rock samples collected from 6 basins in China,the author has come to the following conclusions:1.The parameters 17α21β-Hopane-22S/22R,17α21β-Hopane/17β21α-Moretane and 5α14α17αC29-Sterane-20S/(20R+20S)are available maturity indices of source rocks.2.The sterane ratio 5α14α17αC27/5α14α17αC29 is a better index of kerogen types.3.Some parameters,as Pristane/n-C17,Phytane/n-C18,are of little practical value.606|338|0更新时间：2023-05-30
- 摘要：新中国成立以来,在油气藏勘探和研究方面已取得丰硕的成果。为了总结和交流油气藏形成的地质条件及其分布规律,丰富和发展我国石油地质学理论,进一步指导今后的油气勘探,由中国石油学会石油地质委员会和天津市石油学会联合召开的中国油气藏学术讨论会,于四月六日至十日在天津市举行。623|420|0更新时间：2023-05-30
- 摘要：The Mesozoic volcanic rocks in Nanjing-Wuhu Basin originated from the mantle source.Maoshan and Chaoxian-Hanshan fold zones on both east and west sides of the basin are symmetrically distributed,with an overturned facies strike overthrusting to the Mesozoic-Cenozoic stratum.The intensely pressed,and the overturned facies strike,of Qinglong limestones from the middle-lower Triassic can be found on both flanks of median synclinorium in the west sectionof Ningzhen fold system.Continental clastics from the upper Triassic-lowermiddle Jurassic can be seen only in their core.Things for Nanjing-Wuhu Basin from the east foot of Chaoxian-Hanshan mountain system to the west foot of Maoshan mountain arc all just the same.It is believed that,according to the geological facts showing in the deep texture,fold systems on the east and west flanks of Nanjing-Wuhu Basin and southwestern end of Ningzhen fold on the north of the basins were previously connected with each other.It is because the subduction of the Pacific plate towards the Eurasian plate that brought about the upwarping of the mantle within the area,the extending,the thinning out and cracking of the crust,the exploiding of magama,the drifting of the basement and overlying sedimentary mantle to both east and west and then hiding,and the intensely folding and overturning of overlying formations on both sides,even overthrusting above a new formation within the basin and the volcanic system,thus forming the nappe structure of facies strike on the east and west flanks of the basin at last.This is the basin marginal ramp model formed by volcanic activity of rift type.620|537|0更新时间：2023-05-30
- 摘要：Seismic onlap curves,which was called by P.R.Vail et al"the curves of relative changes of sea level",have been used in correlating continental sequences.This extensive useage,however,sounds doubtful to us owing to the following facts:1.There are 3 kinds of continental basins according to their (water) interconnection with ccean.Water surface in two out of the three kinds,the drainage basins and interior basins,are controlled by the elevation of overflow and climatic conditions respectively.The border basins,i.e.,the sole kind that has water surface rising and falling synchroniously with sea levcl,can be considered as peripheral parts of sea basins,and not really continental ones.2.The onlap points of continental deposits might float within a very wide elevation range,thousand meters above,beneath,or about the lake surface.3.It is more difficultto distinguish normal(coast)onlap and abnormal ones(under-water and areal onlaps)in seismic sections of non-marine sequences than in marine sequences,and may cause lots of confusions.We suggest that onlap curves can not be taken as the curves of relative changes of lake level,not to mention their appliction in correlation of non-marine sequences.It is unreliable to use the similarity of seismic onlap curves to deduct the connectivity between onlap basins.639|360|0更新时间：2023-05-30
- 摘要：The depositional environment of Middle Ordovician sediments in Fuping area of the north of Weihe River has long been disputed.The evidences provided here,such as algal mat,bird,s eye structure,biodisturbation,vertical and oblique intersected burrow,dry crack,gypsum pseudocrystal etc,are the features of intertidal zone.In accordence to chemical element analysis,Fe content is much greater than that of Mn,the content of minor elements is much less than that in deeper marine facies but close to that of fresh water.This also shows that the sediments were deposited in shallow water instead of deep water.Radiolarian siliceous rocks,according to Folk,s study,can be formed in various depositional enviroments.A great deal of acidic volcanic ashes deposited in the sediments of the Middle Ordovician within Fuping area would be bound to change water medium temporarily,providing certain favourable nsconditio for radiolarian to live.In particular,the occurrence of both small amount of radiolarians associated with tubular blue algae and positive elongated chalcedonite has further proved that the radiolarian siliceous rocks were formed in shallow water instead of deep water.Based on the above mentioned,the auther suggests that Middle Ordovician sediments were deposited in the enviroment of the tidal flat on the background of the lagoon,which has the properties of both subtidal and intertidal deposits.611|403|0更新时间：2023-05-30
- 摘要：塔里木盆地生油专题讨论会于1986年3月25日至28日在北京石油勘探开发科学研究院召开。中国科学院、地质矿产部、石油工业部所属二十余个单位的近六十名代表参加了讨论会,大家对塔里木盆地的油源问题特别是对塔北沙参二井的油源问题展开了热烈的讨论。576|433|0更新时间：2023-05-30
- 摘要：The study of the Lower Permian rocks from Pingdingshan,Guishan in Chaoxian of the north Anhui Province within the Lower Yangze area shows that siliceous rocks associated with carbonate rocks in Qixia stage were formed by the precipition,replacement and filling of SiO2 from both deposition and formation water during the diagenetic evolution of carbonate rocks.The occurrence and fabric characteristics of siliceous rocks formed in different peroid are various.Siliceous rocks associated with mudstones and shales in the Cufeng Formation were originated from organisms,directly forming by the accumulation of the remains of siliceous organisms,radiolarians and siliceous sponges in sea water.The contents of siliceous organisms in sea water and the properties of sea water were decisive factors for the formation of these siliceous rocks.674|692|0更新时间：2023-05-30
- 摘要："Lower generating-upper reservoiring"type oil and gas reservoirs are one of the origin type of oil and gas reservoirs in Jizhong depression.This paper discusses briefly the distribution of the oil and gas reservoirs in the depression and analyzes oil supply path during the formation stage of the resrrvoirs.It follows that oil and gas in the reservoirs are from underlying source rocks and migrated vertically within a short distance.653|351|0更新时间：2023-05-30
- 摘要：The block-faulted zone in the northern margin of Qaidam Basin is a terrestrial sedimentary region of the Meso-Cenozoic with an area of 30000km2.within the province,overthrust faults and folds are well developed with the sediments of the Triassic,Jurassic,Cretaceous,Tertiary and Quaternary.Among them,Jurassic sediments in the type of a piedmont depression,is a major hydrocarbon-producing formation with a thickness of 600m.Organic aboundance of which is high,and organic matters are mainly Ⅲ type which in some places have reached a mature stage.Carboniferous marine sediments of the basement may be a potential hydrocarbon-producing formation.It is believed that all conditions are available for the formation of hydrocarbon reservoirs in this region.Among four secondary tectonic units within the area,Saishiteng sag in the western depression is the most favourable for the prospect of oil and gas,and the central uplift and eastern sag,Ainan slop,on the other hand,is considered to be less favourable.569|372|0更新时间：2023-05-30
- 摘要：δ13C-value of carbobitumen from the Lower Paleozoic along the Jiangnan Uplift in the south of the Chang jiang River is generally about 28‰,which is very close to that of bone coal and carbonaceous shale from the Upper Sinian and the Lower Cambrian.This shows that they have close relations with each other.Carbobitumen from the Devonian in Hechi County,Guangxi,originated from Devonian sediments itself,which has something to do with the occurence of higher plants,δ13C-value of which is 6‰ heavier than that of the Lower Paleozoic carbobitumen.δ13C-Value of Lower Paleozoic carbobitumen is at least 7‰ lighter than that of humic coal in the same area,indicating that their origins are not guite the same.559|391|0更新时间：2023-05-30
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