湖相浊积砂岩单砂层厚度对碳酸盐胶结物及储层质量的控制——以渤海湾盆地惠民凹陷沙三上亚段为例  

CONTROL OF THICKNESS OF LACUSTRINE TURBIDITE SINGLE SANDSTONE LAYER ON CARBONATE CEMENTS AND RESERVOIR QUALITY:A CASE STUDY OF THE UPPER SUB-MEMBER OF THE THIRD MEMBER OF SHAHEJIE FORMATION IN HUIMIN SAG,BOHAI BAY BASIN

作　　者：肖伟桐 冯明石[1,2] 李志鹏 杜玉山 王潇 孟万斌[1,2] 王军 杨明林 XIAO Weitong;FENG Mingshi;LI Zhipeng;DU Yushan;WANG Xiao;MENG Wanbin;WANG Jun;YANG Minglin(Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu,Sichuan 610059,China;State Key Laboratory of Oil and Gas Reservoir Geology and Eaploitation,Chengdu University of Technology,Chengdu,Sichuan 610059,China;Research Institute of Erploration and Development,Sinopec Shengli Oilfield Service Corporation 257015,China;No.1 Gas Production Plant,Sinopec North China Oil and Gas Branch,Zhengzhou,Henan 450006,China)

机构地区：[1]成都理工大学沉积地质研究院,四川成都610059 [2]油气藏地质及开发工程国家重点实验室成都理工大学,四川成都610059 [3]中国石油化工股份有限公司胜利油田分公司勘探开发研究院,山东东营257015 [4]中国石油化工股份有限公司华北油气分公司、采气一厂,河南郑州450006

出　　处：《矿物岩石》2023年第1期131-143,共13页Mineralogy and Petrology

基　　金：四川省教育厅重点项目(编号:17ZA0038);国家重大科技专项(项目编号:2017ZX05072002-003)。

摘　　要：渤海湾盆地惠民凹陷商853区块沙三上亚段(E_(2)s_(3)^(s))广泛发育深湖相浊积岩,砂泥岩薄互层发育,储层非均质性强。综合利用岩心观察、薄片鉴定、扫描电镜及图像分析、阴极发光和电子探针等测试手段对商853区块储层岩石学及矿物学、成岩作用和储层物性等进行研究。结果表明,商853区块沙三上亚段砂岩主要为灰、浅灰色或灰褐色长石岩屑砂岩、岩屑砂岩,以“贫长石、富岩屑”为特征,碳酸盐胶结物含量较高,发育含铁白云石、方解石、铁白云石。砂岩储层储集空间主要为粒间溶孔及岩屑粒内溶孔,孔隙度介于3.65%~18.09%,平均值为12.87%,主要分布于10%~15%,占比为43.9%;渗透率介于0.009×10^(-3)μm^(2)~5.460×10^(-3)μm^(2),平均值为0.99×10^(-3)μm^(2),主要分布于0.1×10^(-3)μm^(2)~1.0×10^(-3)μm^(2),占比为41.5%,整体属于中—低孔、特低—超低渗储层。单砂体层顶部和底部碳酸盐胶结物含量高,储层物性差;中部碳酸盐胶结物含量较低,储层物性较好,表明单砂层厚度与碳酸盐胶结物的发育及储层物性具有耦合性,单砂层厚度与碳酸盐胶结物呈负相关,与储层物性呈正相关。The widely developed lacustrine deep-water turbidites in the Upper third member of Shahejie Formation of Eocene(E_(2)s_(3)^(s))in Shang853 Block,Huimin Sag,Bohai Bay Basin are composed of thin inter-bedded sandstone and mudstone with strong reservoir heterogeneity.In this paper,the reservoir petrology and mineralogy,diagenesis and reservoir physical properties of Shang 853 Block are studied by core obser-vation,thin section identification,scanning electron microscope and image analysis,cathode luminescence and electron probe analysis.The results show that the sandstones of the Ez sg in Shang853 Block are mainly gray,light gray or grayish brown colored,with feldspar lithic sandstones and lithic sandstones as its major reservoir composition.The sandstone is poor in feldspar and rich in lithic,with high content of carbonate cements,together with some iron-bearing dolomite,calcite and iron dolomite.The reservoir space of E2s3 sandstone mainly consists of intergranular dissolved pores and intragranular dissolved pores,with the po-rosity ranging from 3.65%to 18.09%,(average value=12.87%),mainly distributed in 10%to 15%,accounting for 43.9%.Permeability of the sandstone ranges from 0.009×10^(-3)μm^(2)to 5.460×10^(-3)μm^(2)to 1.0×10^(-3)μm^(2),acwith an average value of 0.99×10^(-3)3μm^(2),mainly distributed in 0.1×10^(-3)counting for 41.5%,indicating that the reservoir belongs to medium-low porosity and ultra-low permea-bility.The content of carbonate cements at the top and bottom of single sandstone layer is high,with poorly developed reservoir physical property.The content of carbonate cement in the central part of single sandstone layer is low,but with well developed reservoir physical property,indicating that the thickness of single sandstone layer is coupled with the development of carbonate cement and reservoir physical prop-erty,and the thickness of single sandstone layer is negatively correlated with carbonate cement,but posi-tively correlated with reservoir physical property.

关 键 词：浊积砂岩 碳酸盐胶结物 单砂层厚度 沙三上亚段 惠民凹陷 

分 类 号：P588.212.3[天文地球—岩石学]