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柴达木盆地东部上石炭统克鲁克组碎屑岩储层特征及控制因素
投稿时间:2018-02-03  修订日期:2018-05-29  点此下载全文
引用本文:祁柯宁,彭博,李宗星,刘成林,谢庆宾.2018.柴达木盆地东部上石炭统克鲁克组碎屑岩储层特征及控制因素[J].地质论评,64(5):1263-1276
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作者单位E-mail
祁柯宁 1)中国石油大学(北京)地球科学学院北京102249
2)中国地质科学院地质力学研究所北京100081 
damiads@foxmail.com 
彭博 2)中国地质科学院地质力学研究所北京100081 bo.steven.peng@gmail.com 
李宗星 2)中国地质科学院地质力学研究所北京100081  
刘成林 1)中国石油大学(北京)地球科学学院北京102249
3)油气资源与探测国家重点实验室北京102249 
 
谢庆宾 1)中国石油大学(北京)地球科学学院北京102249
3)油气资源与探测国家重点实验室北京102249 
 
基金项目:本文为中国地质调查局地质调查项目“柴达木盆地古生代油气资源调查评价”(编号:1212011120964)的成果。
中文摘要:柴达木盆地上石炭统克鲁克组是该区重要的古生界勘探层位,组内发育多套良好的碎屑岩层。为探究其岩石物性特征及控制因素,本次以野外露头调查为基础,利用普通薄片、铸体薄片鉴定及扫描电镜等手段,结合物性测试和压汞资料,对克鲁克组碎屑岩纵向分布规律,储层岩性、物性、孔喉特征及孔隙类型进行分析。认为克鲁克地层中克2段发育的三角洲前缘亚相和克3段的具障壁海岸潮坪相的大套含砾粗砂岩、粗砂岩砂体原生、次生孔洞发育,孔喉大、分布集中、分选好,为有利的碎屑岩储层。早成岩期压实作用、重结晶及胶结作用对克鲁克组砂岩的原生孔隙破坏严重,晚成岩期储层改造形成的溶孔、裂缝—溶孔是油气成藏的主要储存空间。该研究为预测柴东石炭系克鲁克组油气有利区域提供依据,为今后该地区的油气勘探提供理论支撑。
中文关键词:柴达木盆地  克鲁克组  碎屑岩  相控  储层
 
The Characteristics of Reservoir and Control Factors of Clastic Rock of Upper Carboniferous Keluke Formation In Eastern Qaidam Basin
NameInstitution
QI Kening1) School of Geosciences, China University of Petroleum, Beijing, 102249; 2) Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081
PENG Bo2) Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081
LI Zongxing2) Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081
LIU Chenglin1) School of Geosciences, China University of Petroleum, Beijing, 102249; 3) State Key Laboratory of Petroleum Resources and Prospecting, Beijing, 102249
XIE Qingbin1) School of Geosciences, China University of Petroleum, Beijing, 102249; 3) State Key Laboratory of Petroleum Resources and Prospecting, Beijing, 102249
Abstract:Objectives: The Upper Carboniferous Keluke Formation is an important target position of the Paleozoic stratum in the Qaidam Basin, developing several sets of clastic sandstone reservoirs. Aiming to discuss the petrophysical characteristics and the control factors, the current study focuses on clastic rocks’ vertical units and horizantal distribution of Keluke Formation. Methods:The following studies, including reservoirs’ lithology, physical property, pore throats’ characteristics, and pore types, are analyzed on the basis of investigation of outcrops, inspection data from conventional and casting thin sections, scanning electron microscopes, physical property testing and mercury pressure.Results: In this study, several sets of conglomerate and coarse sandstone formations are built in the delta front facies of 2nd Member Keluke formation(C2k2) and in the tidal flat with barrier beach facies of 3rd Member Keluke formation(C2k3), which developed abundant primary and secondary pores. The pore throats are centrally distributed and well sorted, with spacious pore throats’ tunnels. All these clastic rocks could be favorable clastic reservoirs. The compaction, recrystallization and cementation have caused damage to sandstone’s primary pore during the early stage of diagenesis in the Keluke Formation. Conclusions: However, late stage diagenetic process enhanced reservoir property by creating dissolving holes and crack—dissolving holes, which are the main reservoir property for hydrocarbon accumulation. This study provides theoretical support for potential hydrocarbon reservoir prediction in Upper Carboniferous Keluke Formation in eastern Qaidam Basin.
keywords:Qaidam Basin  Keluke Formation  clastic rocks  phase controlling  clastic reservoirs
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