库车前陆盆地超深层大油气田形成的地质认识

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1、学兔兔www.xuetutu.com中国石油勘探第21卷第1期CHINAPETR0LEUMEXPLORATION2016年1月DOI：10．3969／j．issn．1672-7703．2016．01．004库车前陆盆地超深层大油气田形成的地质认识王招明李勇谢会文能源(中国石油塔里木油田公司)摘要：库车前陆盆地是近年来中国乃至全球超深层油气勘探的热点区域，在盐下6500m至8000m埋深的碎屑岩储层内发现了一批高产、稳产的大型天然气田。地质认识的进步至关重要，为超深层勘探指明了方向。(1)在顶蓬构造的减压作用下，盐下超深层仍发育规模有效储层，储层孔隙度达

2、到3％～9％；构造强挤压应力在盐下断背斜内形成“应力中和面”效应，控制储层垂向分层特征，构造顶部发育高产储层。(2)前陆冲断带强烈挤压作用在盐下形成多排冲断带，断背斜圈闭规模发育，成排成带展布。(3)古近系一新近系巨厚膏盐岩盖层因构造挤压呈塑性流动加厚，叠置于断背斜圈闭之上，具有效封挡作用。库车前陆盆地超深层具有优越的石油地质条件及广阔的勘探前景，南部秋里塔格构造带有望成为超深层油气勘探接替领域。关键词：库车前陆盆地；超深层勘探；天然气；地质认识；盐下断背斜圈闭中图分类号：TEl12文献标识码：AGeologicalunderstandingonthe

3、formationoflarge·-scaleultra·-deepoil--gasfieldinKuqaforelandbasinWangZhaoming，LiYong，XieHuiwen，NengYuan(InstituteofTarimOilfieldCompany,PetroChina，Korla，Xinjiang84100@Abstract：KuqaforelandbasiniSoneofthehotspotsforultra—deephydrocarbonexplorationinChinaandevenaroundtheworld-whe

4、reanumberoflarge—scalegasfieldsofhighandsteadyproductionhavebeendiscoveredinthesubsaltelasticfromation6500mto8000mdeep．Theprogressingeologicalunderstandingiscrucialinfindingoutthedirectionfortheexplorationofultra—deepreservoirs．①Asaresultofthedepressuringefectofroofstructure．the

5、rearelarge—scaleefectivereservoirswithaporosityof3％to9％existinginthesubsalt．“Stressneutralplane”efectformedinthesubsaltfaultanticlinesunderthestrongextrusionstress，controlstheve~icalzonationofthereservoirs，makinghighproductivityreservoirsOccuronthetop．②Aseriesofthrustbeltsarefor

6、medinthesubsaltundertheintensesqueezingactionoftheforelandthrustbelt，whereabundantfaultanticlinetrapsareinrowsandbelts．③ThePaleogenegypsum-saltcaprocksinplasticflowstatecoveringonthefaultanticlinetraps，providingefectivesealing．Theultra-deepreservoirsinKuqaforelandbasinhavefavora

7、blepetroleumgeologicalconditionsandbrightexplorationprospect，andQiulitagestructuralbelt，inthesouthernKuqaforelandbasin，isexpectedtobearelayexplorationdomainofultra—de印hydrocarbon．Keywords：Kuqaforelandbasin，ultra—deepexploration，naturalgas，geologicalunderstanding，subsaltfaultanti

8、clinetraps位于塔里木盆地北缘的库车前陆盆地是中国西部埋深大于6500m的超深层，从石