鄂尔多斯盆地大牛地气田二叠系盒1段储层特征及成岩圈闭  

Reservoir characteristics and diagenetic traps of the first member of Permian Xiashihezi Formation in Daniudi gas field,Ordos Basin

作　　者：徐宁宁 王永诗[3] 张守鹏[2] 邱隆伟[4] 张向津 林茹 XU Ningning;WANG Yongshi;ZHANG Shoupeng;QIU Longwei;ZHANG Xiangjin;LIN Ru(Postdoctoral Scientic ResearchWorking Station of Sinopec Shengli Oilfield Company,Dongying 257000,Shandong,China;Research Institute of Petroleum Exploration and Development,Sinopec Shengli Oilfield Company,Dongying 257022,Shandong,China;Sinopec Shengli Oilfield Company,Dongying 257022,Shandong,China;School of Geosciences,China University of Petroleum(East China),Qingdao 266580,Shandong,China;Tianjin Fanglian Technology Development Co.,Ltd,Tianjin 300280,China;Lu Sheng Petroleum Development Co.,Ltd,Dongying 257077,Shandong,China)

机构地区：[1]中国石化胜利石油管理局博士后科研工作站,山东东营257000 [2]中国石化胜利油田分公司勘探开发研究院,山东东营257022 [3]中国石化胜利油田分公司,山东东营257022 [4]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [5]天津方联科技发展有限公司,天津300280 [6]鲁胜石油开发有限责任公司,山东东营257077

出　　处：《岩性油气藏》2021年第4期52-62,共11页Lithologic Reservoirs

基　　金：国家油气重大专项“济阳坳陷页岩油勘探开发目标评价”(编号:2017ZX05049-004);中国博士后面上基金“基于岩石组构及酸溶试验的低渗透油层改造方法”(编号:2019M662438)联合资助。

摘　　要：为了明确鄂尔多斯盆地大牛地气田二叠系盒1段致密碎屑岩储层特征及成岩圈闭的发育机制,开展了储层含气性分析、铸体薄片鉴定和碳氧同位素分析,并通过对岩石成岩微观特征分析和定量统计,明确了研究区二叠系盒1段气层段和干层段的岩石学特征和成岩-孔隙演化的差异性,阐释了成岩圈闭发育机制。结果表明:①大牛地气田二叠系盒1段干层段比含气段的石英颗粒体积分数低15%左右,填隙物以方解石胶结物和假杂基为主。干层段主要分布于沿主河道方向的2个沉积中心之间的过渡地带、横向河道边部以及较为孤立的透镜体砂岩中。②研究区成岩圈闭封堵层按照成因差异可划分为钙质胶结交代型和压实压溶硅质胶结型,前者方解石胶结特征显著,在成藏期前(中晚侏罗世—白垩世)达到致密程度;后者颗粒间紧密接触,假杂基化特征显著,表现为“边成藏边致密”,储层致密化和油气充注同时发生。③研究区2类圈闭的形成得益于2方面,一是具有良好的储层致密化-成藏耦合关系,二是中成岩A1期的大规模方解石胶结和高塑性岩屑含量导致的持续减孔效应。该研究成果对具有类似地质条件的成岩圈闭勘探具有借鉴作用。In order to clarify the characteristics of tight clastic reservoirs and the development mechanism of diagenetic traps of the first member of Permian Xiashihezi Formation(P1x1)in Daniudi gas field,Ordos Basin,gasbearing property analysis,casting thin section identification and carbon-oxygen isotope analysis were carried out.Through the analysis of diagenetic microscopic characteristics and quantitative statistics,the petrological characteristics and diagenetic porosity evolution of P1x1 in the study area were determined,and the development mechanism of diagenetic traps was explained.The results show that:(1)The content of quartz particles in the dry interval of P1x1 is about 15% lower than that in the gas-bearing interval,and the interstitial-filling materials are mainly calcite cements and compacted dense pseudomatrix.The dry intervals are mainly distributed in the transitional zone between the two sand bodies along the main channel,the edge of the transverse channel and the relatively isolated lenticular sand bodies.(2)The diagenetic traps in the study area can be divided into calcite-cementationreplacement and compaction-silica-cementation according to their genetic differences.The former was characterized by obvious calcite cementation and reached densification before the gas accumulation stage(Middle and Late Jurassic to Cretaceous).Particles in latter were in close contact with each other,with obvious pseudomatrix,which was characterized by"reservoir-forming and densification".The densification of reservoirs and hydrocarbon charging occured at the same time.(3)On the one hand,there is a good coupling relationship between reservoir densification and gas accumulation,and on the other hand,the large-scale calcite cementation in the A1 stage of middle diagenesis and the continuous compaction and pore reduction effect caused by high content of plastic debris.The research results can be used for reference to the exploration of diagenetic traps with similar geological conditions.

关 键 词：致密砂岩 成岩圈闭 成岩相 盒1段 二叠系 大牛地气田 鄂尔多斯盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]