渤海海域旅大21-A构造沙四段储集层特征及控制因素

Reservoir Characteristics and Controlling Factors of E2s4 Member in LD21-A Structure,Bohai Sea Area

刘志刚 杜晓峰 王清斌 王军 王晓刚 郭涛

LIU Zhigang DU Xiaofeng WANG Qingbin WANG Jun WANG Xiaogang GUO Tao

中海石油(中国)有限公司天津分公司渤海油田勘探开发研究院, 天津塘沽 300452

Tianjin Branch of CNOOC Ltd., Tanggu Tianjin 300452, China

渤海海域旅大21-A构造在3600 m以下的沙四段中发现了很好的油气显示,并且测试成功。沙四段在该构造是个新的油气勘探层系,具有很好的勘探前景。为了更好地研究该构造储集层情况,通过对该构造沙四段岩心、壁心资料,运用常规、铸体薄片鉴定和扫描电镜等化验分析资料,对该构造沙四段储集层基本特征进行了系统分析,认为该构造岩性主要以长石岩屑砂岩为主,岩屑长石砂岩次之,孔隙质量为中等~好,渗透率为特低渗~中渗,储集层物性中等。确定了影响储集层物性的主要因素为沉积作用、成岩作用和构造作用,三者综合影响着储集层的物性变化。

Good oil and gas shows have been discovered in E2s4 Member below 3 600 m in LD21-A structure, Bohai sea area and DST was done successfully. E2s4 Member is a new oil & gas exploration layer in this structure, with good exploration prospects. In order to investigate the reservoirs in this structure, the reservoir characteristics have been analyzed systematically with core data, sidewall core data, cast thin section data and the scanning electronic microscope data. It is believed through study that lithologically, the sandstone reservoirs in this structure consist mainly of feldspathic litharenite, secondarily lithic arkose. The reservoir physical properties are medium, with moderate to good porosity, ultra-low to moderate permeability. The main influencing factors on the reservoir physical properties are sedimentation, diagenesis and tectonism. These three factors have influenced together the change of reservoir physical properties.

https://doi.org/10.3969/j.issn.1008-2336.2012.02.026