应用多尺度资料研究川西大邑构造上三叠统须家河组成岩储集相  

Applying multi-scale data to study diagenetic reservoir facies of the Upper Triassic Xujiahe Formation in Dayi Structure,western Sichuan Province

作　　者：林煜[1] 吴胜和[1] 徐樟有[1] 陈策 

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油东方地球物理公司研究院,河北涿州072751

出　　处：《古地理学报》2012年第4期522-532,共11页Journal of Palaeogeography：Chinese Edition

基　　金：国家科技重大专项(编号:2011ZX05009-003);国家油气重大专项(编号:2011ZX05031-003)联合资助

摘　　要：利用丰富的岩心、测井和地震资料,以薄片镜下观察、岩心物性分析、测井曲线交会、地震速度反演等作为手段,对大邑构造上三叠统须家河组储集层成岩储集相的类型、成岩储集相的地质与测井响应特征、以及优质成岩储集相的演化序列与平面分布开展了半定量—定量研究,以期深化低渗透砂岩储集层的地质理论和指导该地区气田的高效开发。结果表明,研究区砂岩可划分为4类成岩储集相,即强破裂杂基溶孔—微孔—裂缝成岩储集相、强压实微孔成岩储集相、强压实致密成岩储集相和强胶结致密成岩储集相。采用声波、密度、电阻率和自然伽马曲线交会的方法可有效识别各类成岩储集相。强破裂杂基溶孔—微孔—裂缝成岩储集相物性最好,为优质成岩储集相,其岩石类型以石英砂岩为主,经历了强烈的压实作用和破裂作用,孔隙度3%～8%,渗透率大于0.5×10-3μm2,主要发育在构造高部位的分流河道和水下分流河道砂体中,沉积因素和构造因素对其平面分布起到了重要控制作用。By the full use of cores, well log and seismic data, the types of diagenetic reservoir faci- es, geological and logging response characteristics of diagenetic reservoir facies, and the diagenetie se-quence and horizontal distribution of high-quality diagenetic reservoir facies of the Upper Triassic Xujiahe Formation in Dayi Structure are semiquantitatively-quantitatively researched through several methods, such as slice observation under microscope, core physical analysis, well curve intersection, seismic velocity inversion and so on. The aims of research are to deepen geological theories of low permeability sandstone reservoir and indicate effective development of gas field in this area. The results show that diagenetic res- ervoir facies of sandstone in the research area can be divided into 4 types, namely, the dissolution pore-micropore-fracture diagenetic reservoir facies with strong fracture, the micropore diagenetic reservoir facies with strong compaction, the tight diagenetie reservoir facies with strong compaction and the tight diagenetie reservoir facies with strong cementation. The curve cross plots of acoustic, density, resistivity and gamma are used to effectively identify different diagenetic reservoir facies. Among 4 types of diagenetic reservoir facies, the dissolution pore-micropore-fracture diagenetie reservoir facies are the high-quality diagenetie reservoir facies, whose porosity is between 3% and 8%, permeability larger than 0.5 × 10^-3 μm62. The high-quality diagenetic reservoir facies mainly develops on distributary channels and subaqueous distributa- rv channels of the high position of structure belt and belongs to quartz sandstone sufferring strong compac-tion and fracture. The distribution of them are controlled by sedimentary factors and structure factors.

关 键 词：大邑构造 须家河组 成岩储集相 多尺度资料 半定量—定量研究 

分 类 号：TE122.2[石油与天然气工程—油气勘探]