塔河地区南部志留系柯坪塔格组油气藏形成条件

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1、学兔兔www.xuetutu.com专天长气肚第29卷第5期OIL&GASGE0L0GY2008年1O月文章编号：0253—9985(2008)05—0632—07塔河地区南部志留系柯坪塔格组油气藏形成条件王毅，陈元壮(中国石油化工股份有限公司石油勘探开发研究院，北京100083)摘要i塔河地区南部志留系柯坪塔格组砂岩属于低孔、低渗储集岩，局部发育厚层滨岸相、三角洲分流河道、河口砂坝以及潮汐水道等优质储集岩，发育多套储盖组合。塔河地区南部寒武一奥陶系烃源岩形成的烃类，沿着断裂、裂隙、砂岩和不整合面经过上奥陶统桑塔木组泥岩

2、运移到柯坪塔格组砂岩聚集成藏。柯坪塔格组油气藏以喜马拉雅期成藏为主，发育背斜、地层不整合遮挡、地层超覆、岩性以及构造一岩性复合型等5种油气藏类型，围绕塔河北部高部位志留系剥蚀尖灭线附近是地层不整合遮挡油气藏有利成藏区，往南是背斜、地层超覆及岩性、构造一岩性复合型油气藏有利成藏区。志留系砂岩具有深埋藏、大面积、低丰度、薄油气层、断层沟通、叠合连片的油气聚集特点，可能还存在致密砂岩气藏，油气资源潜力可观。关键词：储集岩；油气藏类型；分布模式；油气资源潜力；志留系；塔河南部中图分类号：TEl22．3文献标识码：AConditi

3、onsofhydrocarbonpoolingintheSilurianKepingtageFormationinthesouthernTaheregionoftheTarimBasinWangYi，ChenYuanzhuang(PetroleumExploration,andProductionResearchInstitute，SINOPEC，Beijing100083，China)Abstract：Basedonanintegratedanalysisoftheconditionsofhydrocarbonpool

4、ing，typesanddistributionofthereservoirsintheLowerSilurianKepingtageFormationinthesouthernTaheregionoftheTarimbasin，thispaperfocusesonthedistributionpatternsoftheSilurianhydrocarbonreservoirsinthesouthernTaheregionandesti-matesthehydrocarbonpotentialinthisarea．The

5、Kepingtagesandstonesareresetaroirrockswithlowporosityandlowpermeability，butsomeofthemarequalityreservoirs，suchasthickshoresidefacies，distributarychannelsindelta，mouthbarsandtidalchanne1．Severalreservoir-sealcombinationsweredevelopedintheSilurian．Hydro—carbonsgene

6、ratedfromtheCambro·-OrdoviciansourcerocksinthesouthernTaheregionmigratedtoandaeeu·-mulatedintheKepingtagesandstonesthroughUpperOrdovicianSangtamumudstoneviafaults，fractures，sand—stonelayersandunconformities．Fivetypesofreservoirs，includinganticline，unconformitybar

7、rier，onlap，litholog-icalandstructural-lithologicalcombinationreservoirs，arerecognizedintheKepingtageFormationandweremainlydevelopedintheHimalayanperiod．Theunconformitybarierreservoirsaremainlydistributedaroundthedenudationpinch—outlineoftheSilurianinthehighofthen

8、orthernTahearea，whiletheanticline，onlap，litho—logicalandstructural—lithologicalcombinationreservoirsaremainlydistributedinthesouthernTahearea．TheSi—luriansands