SDG地区致密砂岩气藏储层孔隙演化定量分析  

Microstructure Characteristics and Quantitative Analysis on Porosity Evolution of Ultra-low Permeability Tight Sandstone Gas Reservoir

作　　者：陈佩佩[1] 胡望水[1] CHEN Peipei;HU Wangshui(The Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, College of Geoscieuces, Yangtze University, Wuhan, Hubei 430100, China)

机构地区：[1]长江大学地球科学学院油气资源与勘探技术教育部重点实验室,湖北武汉430100

出　　处：《中国锰业》2018年第2期138-140,共3页China Manganese Industry

基　　金：国家自然科学基金项目(40872099)

摘　　要：为探讨SDG地区储层孔隙演化,在对储层特征、储集空间及成岩作用研究的前提下,结合薄片鉴定成果,采用定性分析与定量计算的方法分析孔隙演化过程。研究区蓬二气藏储层孔隙以粒间溶蚀孔隙为主,其次为次生粒内溶孔,微裂缝的发育具有改善储层的渗透性的作用。根据原始孔隙度与分选系数的关系恢复出研究区储层初始孔隙度为39.6%,成岩初期压实损失23.7%的孔隙度;石英加大和高岭石沉淀,白云石胶结交代方解石,造成15.9%的孔隙度损失,并形成交代残余;区内溶蚀作用发育程度中等,长石、岩屑等不稳定颗粒溶蚀,形成次生孔隙,贡献了3.07%的孔隙度,改善了储层的渗透性。通过10个样品计算目前研究区蓬二气藏孔隙度平均值为7.7%,样品物性分析孔隙度平均值为7.72%,总体分析误差为0.26%,具有较高的吻合性,说明研究方法可行,计算结果较符合实际,可用于对类似储层孔隙演化的研究。In order to explore the reservoir pore evolution of the SDG district,we used the method of qualitative analysis and quantitative calculation for research,on the premise of reservoir characteristics and diagenesis research combined with a large number of microscopic thin section identification results. The reservoir pore is mainly intergranular dissolution pore,secondary is intergranular dissolved pore,the development of micro cracks have a advantage on improving the permeability of the reservoir. According to the relationship of original prosity and sorting coefficient recovering the initial porosity of the reservoir in the studied area is 39. 6%,the early compaction loss 23. 7%porosity. Then Quartz increase and kaolinite precipitation,dolomite cementation and replace calcite,which causing loss to the porosity of 15. 9%,forming metasomatism residual. Unstable feldspar and rock debris particle dissolution whose dissolution degree is medium,forming the secondary pore,contributed 3. 07% of the porosity. Calculate the average porosity was 7. 7%,the average porosity of the samples analysis physical properties is 7. 72%,the overall analysis of error was 0. 26%,which is of higher anastomotic,and at the same time means that the research methods and conclusions are reliable,on a degree which has reference significance for similar reservoir pore evolution research.

关 键 词：孔隙演化 孔隙结构 成岩作用 特低渗 蓬二气藏 

分 类 号：TE122.2[石油与天然气工程—油气勘探]