最新刊期
卷 18 ， 期 2 ， 1997
- 摘要：Continental sequence has its own characteristics.Firstly,its base level is a curved rather than a horizontal surface and has a higher elevation than that of sea level.The method proposed by Cross solved this problem appreciatively,but its final result has to be checked by seismic data.Secondly,geological age of sequences is difficult to be determined.More work should be carried out in physical,radioisotopic and chemical age dating.Thirdly,continuous strong reflections should be deal with correctly.Not all continuous strong isopic axes are sequences boundaries,and none of the continuous strong reflection can cover a whole basin.Finally,the types and abundances of organic matter in source rocks and their physical and chemical processes in hydrocarbon generation should be studies.These four problems in sequence stratigraphic study should be paid more attention to in the future.关键词：层序地层学;基准面;陆相层序;年龄确定;生油岩581|837|0更新时间：2023-05-30
- 摘要：The Upper Guantao Formation of the Tertiary in Shenghai Region,Jiyang Depression is dominated by fluvial flood plain facies. Different scales of sequence cycles could be identified according to the cores,logs and seismic data of the formation.Short term base level cycles could be identified based on rock cores,intermediate term base level cycles could be identified through log seismic data correlation.Then the principle of the base level cycles was used to build high resolution isochronous stratigraphic correlation framwork,study the evolution proporty and the process of fluvial sequences,predict the spatial distribution of oil reservoirs.关键词：基准面;旋回;高分辨率;对比;河流相;储层预测690|1003|0更新时间：2023-05-30
- 摘要：Based on the principle of base level,three scales of stratigraphic cycles(short term, intermediate term and long term)could be identified through the analysis of cores,logs and seismic data.The stratigraphic cycles correspond respectively to different order base level cycles. Different types of facies successions occurred in different positions of the base level cycles. In light of the identification of multi order base level cycles,2 D high resolution sequence stratigraphic framework is established.Finally,a new proposal about favorable reservoir formations and hydrocarbon generation conditions in Qianliyuan Depression have been proposed.关键词：地层基准面;湖相;高分辨率;层序地层;储层预测;前梨园洼陷572|1623|0更新时间：2023-05-30
- 摘要：Geostatistic method is an effective approach in studying the distribution of spatial variation including regional variation,variation function,kriged estimate.In seismic data processing,static correction,superficial velocity,time difference,dip angle and curved ray may result in errors in interval velocity calculation.The geostatistic method could find the internal space variation regularity of interval velocity,restrain random error and improve signal noise ratio,thus correcting the error of seismic interval velosity.关键词：层速度;地质统计学;系统误差;随机误差;校正619|890|0更新时间：2023-05-30
- 摘要：The analysis of sedimentary base level is the key to the identification and correlation of isochronostratigraphic units.The qualitative or semi quantitative baes level curves could be constructed based on the analyses of seismic data and well logs.(1)The onlap curve that represents baes level changes could be obtained by the correlation of differential subsidence,decompaction and stratigraphic restoration based on the identification of basin margin onlap,coastal onlap and marine onlap in seismic sections.(2)Milankovitch cycles could be identified through spectral technique of well logs;accommodation curve reflecting base level cycles could be established by means of corrected Fischer plot.Sedimentary base level curves obtained by different analysis techniques of seismic sections and well logs in North Tarim show good consistency,and they could be in the analyses of sequence stratigraphy,determination of sequence orders,correlation of interwell strata units and the study of tectonic and depositional histories of a basin.关键词：沉积基准面;上超点曲线;米兰柯维奇旋回;层序地层;分析技术603|1285|0更新时间：2023-05-30
- 摘要：The numerical modelling of tectonic stress field in Minhe Basin during Jurassic Early Cretaceous was made.The result indicates that the basin was in sinistral shear and dextral transportation regime.The induced stress field under the regime determined the basin to be a extentional one.The situs of sub basins and the direction of structural distribution that predicted by the modelling have been verified by geological survey.The Jurassic structures trend was NEE,whereas Early Cretaceous structures extended NE or NWW,and coal bearing sequences developed in separated sub basins during Middle Jurassic.关键词：民和盆地;侏罗纪;早白垩世;应力场模拟638|787|0更新时间：2023-05-30
- 摘要：Different orders of unconformities in North Tarim Basin are resulted from tectonic movement,stress field transformation and sea level changes.According to multi order unconformities in stratigraphic record,the sequences of Sinian Paleozoic in the study area could be distingushed into 3 megasequences,9 supersequence sets and 39 third order sequences.Though the sedimentary environment,typical featrues of system tracts and distribution regularities of the 3 megasequences are different,the superposition patterns of the third order suquences are basically the same,that is,aggradation,transgression,regression and onlap associations.Based on chronostratigraphic framework,the Sinian Paleozoic could be divided into 3 mega cycles of sedimention.The unconformities between the mega cycles controlled the transformation of depositional pattern.关键词：不整合面;层序格架;体系域;年代地层680|1590|0更新时间：2023-05-30
- 摘要：The Early Paleozoic of Ordos massif underwent the evolution processes of siliciclastic→carbonate ramp→rimmed shelf→distally steepened ramp→aulocogen→evaporate platform which correspond to five superseguences developed respectively in Early Cambriam,the early stage of Middle Cambrian,Middle Late Cambrian,the Yeli Liangjiashan period of Early Ordovician,the Majiagou period of Early Ordovician and Middle Ordovician.Take the huge unconformity in the bottom of Middle Ordovician as the boundary,the sequences could be classified into Sauk and Tippecanoe suppersequence sets.The formation of the boundaries of the supersequences and supersequence sets was related to the mutation of tectonic subsidence and tectonic movement.Most periods of sea level changes of Cambrian in Ordos Basin coupledwith global identity of eustatic cycle,except the high frequency in low frequence in Gushan period.Tectonic movement was weakend during Early Ordovician,high frequency sequences developed well.Late Ordovician contained 5 6 sequence periods.According to the analysis of organic geochemistry,the main source rocks are the condensed sections with dark limestones and shales in the Zhangxia Formation of Cambrian,the Majiagou and Wulalike Formations of Ordovician.Favorable reservoirs are paleo karst related to regional unconformity,carbonate buildup and bioclastic limestone in TST and HST,turbidite in LST and dolostone or grainstone in lower LST and higher HST.关键词：早古生代;层序地层;台地演化;烃源岩;储层预测610|1422|0更新时间：2023-05-30
- 摘要：The variation of isotopic properties of gas within a continuous reservoir is generally small but can be significant between fault blocks of one reservoir or between unconnected but closely stacked reservoirs.Thus isotopic analysis of gas could be used to identify the continuity of reservoir,define faults and derive more accurately reservoir description.The isotopic analyses in commingled production could be used to allocate contributions of individual sands and distinguish underlying oil reservoirs.关键词：天然气;储层地球化学;同位素指纹;流体单元;配产;油藏预测569|1038|0更新时间：2023-05-30
- 摘要：The Paleozoic burial types of the east uplift in Liaohe Basin could be divided into three kinds,i.e.relative subsidence type,later subsidence type and secular uplift type.Combined with the data of its geothermal evolution,the hydrocarbon property of this area was analysed.In the relative subsidence area,part of the Paleozoic group may re generate hydrocarbon and the Lishugou Formation of Lower Cretaceous may have hydrocarbon generating patential.The other two types have hardly any hydrocarbon due to their shallow burial depth.From the view point of structural evoluion,primary and secondary pools may be found in the conjunction parts of the Paleozozic uplifts and the Mesozoic depressions.If there are good source sags to match laterally monocline pools,secondary Cenozoic pools with Paleozoic source rocks may be found.关键词：埋藏剥蚀史;埋藏类型;油气;东部凸起;辽河盆地483|782|0更新时间：2023-05-30
- 摘要：Two types of fan deltaic sequences have been identified in Bijia fault block,Binnan Oilfield,i e.near source sequence and far source sequenec.The sequences from the fourth to the first sand beds suggest the evolution process of shallow →bathyal water evironment.The north marginal contemporaneous fault controlled the debris supply of 1st～3rd sand beds,and the forth sand bed seemed to have multi source supplies.Reservoirs in this area are mainly various sand bodies in fan deltaic front,among which river mouth bars and distributary channels are more favourable.The vertical heterogeneity of the reservoirs are closely related to depositional evolution.关键词：储层沉积学;毕家断块;扇三角洲;非均质性632|1304|0更新时间：2023-05-30
- 摘要：Based on the analysis of regional seismic lines,well logs and outcrops,3 megasequences and 17 super seismic sequences have been recognized.The period of supersequence is about 37 Ma.The formation of megasequence boundaries was related to the convergence between Pacific Plate and South China Plate.Supersequence boundaries could be traced and correlated regionally,most of them correspond with tectonics.关键词：四川盆地;层序地层学;巨层序;超层序639|964|0更新时间：2023-05-30
- 摘要：Minhe Basin is situated on central Qilian uplift belt. The basement of the basin includes the Proterozoic and Lower Paleozoic,the caprooks are Jurassic, Cretaceous, Tertiary and Quaternary. The basal structures are primarily in NW direction. The structures formed in Yenshan movement are mainly distributed in NW, EW, nearly EW, NS and nearly NS directions; the superimposition of milti directional structures has made them more complicated. The structures formed in Himalayan movement are predominantly distributed in NW direction within Bazhou Depression and Zhoujiatai uplipt . Multi stage superimposition and composition of the structures resulted in netted tectonic framework of the basin.关键词：民和盆地;构造特征;叠加;复合682|853|0更新时间：2023-05-30
- 摘要：Condensed section could be identified according to seismic data,well log, geochemical and fossil markers. Since its deposition environment was relatively stable, the species of orgomisms are various and organic matter is rich enough, the section could be taken as a key in stratigraphic correlation. It has been proved in practice that this kind of sections are usually important source rocks or regional cap rocks. According to the above mentioned markers, the Jiergalangtu Depression could be divided into five condensed sections with considerable oil generation potential.关键词：密集段;识别标志;地质意义;吉尔嘎朗图;凹陷688|940|0更新时间：2023-05-30
- 摘要：Thermal history analysis results indicate that the heat flux of Yanji Basin increased with the inerease of extension degree during fracture stage, and the value even reached 94 m W/m2 during early Longjing stage; the value delayed by index during the subsiding stage of the basin, and it decreased during denudation stage.During late Longjing stage, the basin was uplifted and eroded. This happened to be the maturation stage of the source rocks of the basin,hydrocarbon resources generated might be easily lost due to the poor preservation condition. Thus oil and gas exploration in this basin would run a high risk.关键词：镜质体反射率;磷灰石;封闭径迹长度;热史;延吉盆地570|948|0更新时间：2023-05-30
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