低渗透砂岩微孔特征与孔隙结构类型的关系——以东营凹陷南斜坡沙四段为例  

Relationship between micro-pore characteristics and pore structure of low permeability sandstone:a case of the fourth member of Shahejie Formation in southern slope of Dongying Sag

作　　者：闫建平[1,2] 梁强[2] 耿斌[3] 赖富强[4] 温丹妮[5] 汪宙峰[2] YAN Jianping;LIANG Qiang;GENG Bin;LAI Fuqiang;WEN Danni;WANG Zhoufeng(Sichuan Provincial Key Laboratory of Natural Gas Geology,Southwest Petroleum University,Chengdu 610500,China;School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China;Research Institute of Exploration and Development,Shengli Oilfield Company,Sinopec,Dongying 257015,Shandong,China;Chongqing Key Laboratory of Complex Oil & Gas Field Exploration and Development,Chongqing University of Science & echnology,Chongqing 401331,China;Well Logging Branch,Southwest Petroleum Engineering Co.,Ltd.,Sinopec,Chengdu 610500,China)

机构地区：[1]西南石油大学天然气地质四川省重点实验室,成都610500 [2]西南石油大学地球科学与技术学院,成都610500 [3]中国石化胜利油田分公司勘探开发研究院,山东东营257015 [4]重庆科技学院复杂油气田勘探开发重庆市重点实验室,重庆401331 [5]中国石化西南油气工程有限公司测井分公司,成都610500

出　　处：《岩性油气藏》2017年第3期18-26,共9页Lithologic Reservoirs

基　　金：国家自然科学基金项目"页岩气储层微观结构及岩石物理响应数值模拟研究"(编号:41202110);"基于成像测井的页岩气层可压裂性评价方法研究"(编号:41402118);四川省应用基础研究项目"泥页岩地层周期及高分辨率沉积旋回测井识别研究"(编号:2015JY0200);四川省测绘地理信息局支撑课题"地理国情监测支撑下的山区公路沿线地质生态环境承载力研究"(编号:J2014ZC12)联合资助

摘　　要：低渗透砂岩已成为油气增储上产的重要勘探开发目标,但孔隙结构类型多样、微孔发育使得测井响应特征难以明显反映储层及其有效性。利用压汞、核磁共振、物性、薄片及CT等资料分析东营凹陷南斜坡沙四段(Es_4)低渗透滩坝砂岩孔隙结构,并将其划分为三大类五小类,即:Ⅰ类(Ⅰ_1和Ⅰ_2)、Ⅱ类(Ⅱ_1和Ⅱ_2)和Ⅲ类。孔隙结构类型受控于矿物、粒径及成岩作用等的综合影响,微孔(孔喉半径<0.024 8μm)含量及其特征是造成孔隙结构类型差异的重要因素。在此基础上,分析矿物含量、粒径、电性与微孔含量的关系,发现矿物、粒径影响微孔含量及特征,且微孔含量与电性特征关系密切。利用测井曲线对低渗透砂岩微孔含量变化的敏感性,有助于在井筒剖面进行孔隙结构类型划分及识别有效储层。The low permeability sandstone reservoir has become an important exploration target,but the varietyof micro-pore structure makes the logging response characteristics difficult to reflect reservoir features clearly.The data of mercury injection,nuclear magnetic resonance(NMR),physical properties,thin sections and CT were used to analyze the pore structure of low permeability beach bar sandstone of the fourth member of ShahejieFormation(Es4)in southern slope of Dongying Sag.The pore structure were divided into three types and five subtypes:typeⅠ(Ⅰ1andⅠ2),type II(Ⅱ1andⅡ2)and typeⅢ.The pore structure type is controlled by mineral content,grain size and diagenesis.The volume and features of micropores(pore throat radius less than0.0248μm)are important factors that cause the differences of pore structure types.The relationships among micropore volume,mineral content,grain size and electric properties were analyzed.It is found that mineral content and grainsize affect micropore volume and features.In addition,the micropore volume is closely related to the electricproperties.Logging curves are sensitive to the change of micropore volume,so it is helpful for dividing porestructure type in wellbore and identifying effective reservoirs.

关 键 词：低渗透砂岩 孔隙结构 微孔特征 压汞曲线 核磁共振 东营凹陷 

分 类 号：TE122[石油与天然气工程—油气勘探]