鄂尔多斯盆地长北气田山2段三角洲沉积体系和砂体展布特征  

Delta depositional system and sandbody distribution of the second member of Shanxi Formation in Changbei Gasfield,Ordos Basin

作　　者：王华[1] 郑荣才[2] 周祺[2] 李凤杰[2] 魏钦廉[2] 

机构地区：[1]中国石油长庆油田分公司长北项目经理部 [2]成都理工大学'油气藏地质及开发工程'国家重点实验室

出　　处：《岩性油气藏》2008年第2期22-28,共7页Lithologic Reservoirs

摘　　要：长北气田位于鄂尔多斯盆地陕北斜坡东北部,下二叠统山西组为一套碎屑沉积,自上而下被划分为山1(P1s1)和山2(P1s2)等2个岩性段,其中山2段是长北气田主力产层。在岩心描述、岩矿分析及测井资料综合研究的基础上,确定山2段属于海相辫状河三角洲沉积体系。在长北气田范围内,主要发育三角洲平原亚相,次为前缘亚相,其广泛发育的分流河道砂体为油气聚集提供了有利场所。文中采用层序-岩相古地理编图的技术方法,详细描述了山2段砂体的展布特征,为储层预测和描述提供了可靠依据。Changbei Gasfield is located in the northeast of Shanbei Slope in Ordos Basin. Shanxi Formation of Lower Permian is a series of clastic deposits, and it can be divided into two lithologic segments （P1s1 and P1s2） ,between which the second member of Shanxi Formation （P1s2） is the principal producing formation. Based on core description, mineral analysis and well logging data, Shan 2 member is considered as marine braided river delta deposit. Delta plain subfacies developed well in Changbei Gasfield, of which the widely developed distributary channel sandbodies are favorable for the hydrocarbon accumulation. The method of sequence-lithofacies paleogeography mapping is adopted to describe the sandbody distribution characteristics of Shan 2 member, which could offer reliable reference for reservoir prediction.

关 键 词：辫状河三角洲 分流河道砂体 储层预测 长北气田 鄂尔多斯盆地 

分 类 号：TE121.3[石油与天然气工程—油气勘探]