摘要
下扬子黄桥地区二叠系龙潭组砂岩储层物性总体较差,属于致密砂岩储层。通过对该地区多口钻井岩心的观察研究,并对岩石薄片进行鉴定、电镜扫描及黏土矿物X-射线衍射分析,认识和恢复储层成岩作用及孔隙演化过程。研究结果表明:龙潭组砂岩主要成岩作用有压实作用、胶结作用、交代作用、溶蚀作用和压溶作用,它们对孔隙发育的影响很大。压实作用和胶结作用是导致储层致密化的主要因素。长石、岩屑、杂基及石英的溶蚀作用是形成次生孔隙的主要因素,明显提高了致密砂岩的储集性能。
Sandstone reservoir of the Permian Longtan formation in Huangqiao area, lower Yangtze region has poor properties and belongs to tight sandstone reservoir. Through the observation of the cores of multiple wells, the identification of rock slices, scan- ning electron microscopy and X-ray diffraction analysis of clay mineral, the reservoir diagenesis and the pore evolution process were recognized and restored. The research results show that the diagenesis of sandstone of Longtan formation are compaction, ce- mentation, metasomatism, denudation and pressolution, which affect a lot on pore development. The compaction and cementation are the main factors which cause the densification of the reservoir. The denudation of feldspar, clastic debris, matrix and quartz is the main factor to form the secondary pore, which obviously improves the storage performance of the tight sandstone.
出处
《油气藏评价与开发》
2013年第6期10-14,共5页
Petroleum Reservoir Evaluation and Development
关键词
成岩作用
孔隙演化
致密砂岩储层
下扬子黄桥地区
diagenesis, pore evolution, tight sandstone reservoir, Huangqiao area of Lower Yangtze
