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ID:31364272
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页数:21页
时间:2019-01-09
《中上扬子地区海相隆坳格局与油气聚集保存》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、中上扬子地区海相隆坳格局与油气聚集保存 摘要:隆坳格局是海相油气聚集区及其保存条件的早期控制因素。综合地质、钻井、地震、测试等多种资料,编制关键界面埋深图、剥蚀程度图、古地质图、构造叠合图及构造演化剖面等,研究中上扬子地区海相隆坳格局特征,分析油气运移聚集和保存条件。结果表明:加里东期隆坳格局以EW向和NE向为主,出现鄂西坳陷、川南坳陷、黔东南坳陷、江汉盆地北部坳陷等四大坳陷以及江南―雪峰隆起、黔中隆起及乐山―龙女寺隆起等三大隆起;古隆起及扬子板块南、北缘长期稳定的大规模斜坡带控制了以下寒武统为烃源岩的油气运移和聚集;印支期对加里东期的构造反转作用明显,印支期的
2、坳陷基本上位于加里东期古隆起之上;扬子地区的隆坳格局主要呈SN向和NE向,形成泸州隆起、川西坳陷、湘鄂西―黔西南坳陷;此时形成的古隆起控制了以下志留统和下二叠统为烃源岩的油气运移和聚集。 关键词:古构造;海相地层;扬子板块;保存条件;古生界;油气聚集;勘探方向;有利区 中图分类号:P618.13文献标志码:A Abstract:Theupliftanddepressionpatternsareearlycontrolfactorsofhydrocarbonaccumulationandpreservationconditionsinmarinesequenc
3、e.Basedonthegeology,drilling,seismicandtestdata,thedepthmapsofcriticalinterface,erosiondegree21maps,paleogeologicalmap,superimposedtectonicmapandevolutionprofilesofpaleo-structurewerecompiled,andtheupliftanddepressionpatternsofmarinesequencewerestudied,andthepetroleummigrationandaccum
4、ulation,andpreservationconditionswereanalyzed.TheresultsshowthattheupliftanddepressionpatternsinCaledonianaredominatedbyEWandNEdirections,andappearfourdepressionsincludingWestHubeidepression,SouthSichuandepression,SoutheastGuizhoudepressionandNorthJianghanBasindepression,andthreeuplif
5、tsincludingJiangnan-Xuefenguplift,MiddleGuizhouupliftandLeshan-Longnusiuplift;paleo-upliftsandlarge-scaleslopebeltswithlong-termstabilityinthesouthernandnorthernedgesofYangtzePlate,controlsthehydrocarbonmigrationandaccumulationofLowerCambriansourcerocks;thetectonicinversionofIndosinia
6、ntoCaledonianisobvious,andtheIndosiniandepressionlocatesontheCaledonianpaleo-uplift;theupliftanddepressionpatternsinYangtzeregionaredominatedbySNandNEdirections,formingLuzhouuplift,WestSichuandepression,andWestHunanandHubei-SoutheastGuizhoudepression;thepaleo-upliftformedcontrolsthehy
7、drocarbonmigrationandaccumulationofLowerSilurianandLowerPermiansourcerocks. Keywords:paleo-structure;marinestratum;Yangtze21Plate;preservationcondition;Paleozoic;petroleumaccumulation;explorationdirection;favourablearea 0引言 中国大陆长期处于全球动力学复合-联合体系,经历了多块体拼合,形成了一系列具有多旋回叠加结构的特色海相沉积盆地[1-5
8、]。随着油
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