中、上扬子区志留系油气成藏特点与勘探前景

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1、学兔兔www.xuetutu.com专天然气比第29卷第5期OIL＆GASGEOL0GY2008年10月文章编号：0253—9985(2008)05—0589—08中、上扬子区志留系油气成藏特点与勘探前景肖开华，李双建，汪新伟，张荣强，龙胜祥(中国石油化股份有限公司石油勘探开发研究院，北京100083)摘要：中、上扬子区上奥陶统一志留系优质烃源岩主要发育于上奥陶统五峰组和下志留统底部，以好烃源岩一最好烃源岩为主。志留系碎屑岩和碳酸盐岩两类储集岩均以低孔低渗一特低孔低渗为特征，碎屑岩是主要储集岩类。下志留统龙马溪组为优势盖层发育层位，是

2、一套良好的区域性盖层，现今总体上处于中成岩B期一晚成岩期，虽演化程度高，但仍具有良好的封盖能力。上扬子川东地区大规模生烃期较早，大部分志留系烃源岩在中侏罗世就达到了生油高峰；中扬子区大部分志留系烃源岩达到生油高峰期较晚，为晚三叠世。古构造控制着志留系油气的运移方向和聚集部位，川东南一鄂西渝东区为志留系天然气勘探最有利区，江汉平原南部冲断褶皱区为有利区。关键词：成藏条件；成藏特点；勘探前景；志留系；中、上扬子区中图分类号：TEl12．3文献标识码：AHydrocarbonaccumulationfeaturesandexploratio

3、ndirectionintheSilurianoftheMiddle—UpperYangtzePlatformXiaoKaihua，LiShuangjian，WangXinwei，ZhangRongqiang，LongShengxiang(SINOPECExplorationandProductionResearchInstitute，Beijing100083，China)Abstract：HighqualitysourcerocksintheUpperOrdovicianandtheLowerSilurianinsouthernC

4、hinaaremain—lydevelopedintheWufengFormationoftheUpperOrdovicianandatthebottomoftheLowerSilurian．BoththeSilurianclasticreservoirsandcarbonatereservoirsfeatureinlow·-andultra-lowporosityandpermeabilityandtheformeristhepredominantreservoirtype．TheLowerSilurianLongmaxiForma

5、tionisasetofqualityregionalsealandisintheBtolatestageofdiagenesisasawhole．Althoughbeingathighlevelofevolution，theyserveasgoodsealingforpetroleumaccumulations．TheeasternSichuanbasinoftheUpperYangtzePlatformhadwit—nessedlarge-scalehydrocarbongenerationinarelativelyearlyti

6、mewithmostoftheSiluriansourcerocksreac-hinghydrocarbongenerationpeakduringthemiddleJurassic；whilemostoftheSiluriansourcerocksintheMid-dleYangtzePlatformenteredhydrocarbongenerationpeaklateintheLateTriassic．ThehydrocarbonmigrationandaccumulationduringtheSilurianwerecontr

7、olledbyPaleo—tectonicevolution．Therefore，itissuggestedthatthesouthwesternSichuanprovinces，westernHubeiProvince，andeasternChongqingmunicipalityarethemostfavorableareasforexplorationofSiluriangas，whilethethrust—foldareainthesouthernJianghanplainisthefa—vorablearea．Keyword

8、s：accumulationcondition；accumulationcharacter；explorationprospect；Silurian；MiddleandUpperYangtzePlatforIn长期以来，