多旋回叠合盆地低渗透储层成岩作用与孔隙演化  

Diagenesis and Porosity Evolution of Low Permeability Reservoirs in Multicycle Superposed Basin

作　　者：王继超 白远 

机构地区：[1]陕西延长石油(集团)有限责任公司研究院,陕西西安710069

出　　处：《辽宁化工》2016年第6期820-822,826,共4页Liaoning Chemical Industry

基　　金：延长油田股份有限公司创新基金项目;项目号:ycsy2013ky-A-01

摘　　要：多旋回叠合盆地为油气勘探的热点地区,其储层致密且多为隐蔽性的岩性油气藏,尤其成岩作用与孔隙演化较为复杂,备受地质学家关注。本次研究依据陕北地区探井取心物性分析、薄片鉴定、扫描电镜、阴极发光及铸体薄片等资料,系统分析研究区延长组长8油层组储层特征、成岩作用、孔隙定量演化。结果表明区内长8油层组砂岩为分选中-好、次棱角状为主的细粒长石砂岩或细粒岩屑长石砂岩,孔隙度平均值为8.5%。渗透率平均值为0.42×10^-3μm^2,为特低孔-超低渗储层,长8储层原始孔隙度平均值为38.03%,压实后的孔隙度平均为21.58%,胶结作用下砂岩孔隙度平均接近6.89%,后期溶蚀作用增加孔隙度在2.04%~6.56%,平均孔隙度接近10.77%,孔隙演化的定量计算与岩心的物性分析结果较为一致,同时本区长8储层致密时期主要发生在早期的压实和胶结作用,而后期的溶蚀作用极大的改善了储层的物性。The multi-cycle superposed basin is a hot area for oil and gas exploration, its reservoir is tight and hidden pool, which has attracted many attentions of the geologists, especially diagenesis and pore evolution is relatively complex. On the basis of exploratory well core physical property analysis, thin section identification, scanning electron microscope, cathodoluminescence and the casting thin sections, such as, systematical analysis petrology characteristics, diagenetic types and porosity evolution of Chang 8 member reservoir in Xiasiwan oil-field. Results show that Chang 8 member reservoir is feldspar sandstone and lithic-feldspar sandstone with good sorting and subangular grain. The reservoir property are mainly ultra-low porosity with the average porosity of 8.5%, ultra-low permeability reservoir with the average permeability of 0.42×10^-3μm^2.The average original porosity of Chang 8 member reservoir is 38.03%, the average porosity is 21.58% after compaction, the average porosity is close to 6.89% after cementing, the average porosity increase in 2.04%-6.56% later dissolution, the average porosity of close to 10.77%. Porosity evolution of quantitative calculation are consistent with core physical property analysis of the results, at the same time, the Chang 8 member reservoir density period mainly occurred in the early compaction and cementation, and dissolution of the late great improved the physical property of reservoir.

关 键 词：多旋回叠合盆地 陕北地区 长8油层组 成岩作用 孔隙定量演化 

分 类 号：TE122[石油与天然气工程—油气勘探]