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鄂尔多斯盆地西峰油田延长组长81低渗透储层成岩作用
李红 柳益群 刘林玉
摘 要:鄂尔多斯盆地西峰油田延长组长81砂岩储集层主要由岩屑质长石砂岩和长石质岩屑砂岩组成,平均孔隙度8.32%,平均渗透率1.33 ×10-3μm2,属低孔低渗型储集层.储集层经历了成岩作用及交代作用、溶解作用、破裂作用的改造,目前处于晚成岩A期-B期.其中,早成岩阶段的机械压实作用和晚成岩阶段含铁碳酸盐的胶结作用是造成储集层物性差的主要原因.根据成岩作用特点,在研究区辫状河三角洲前缘砂体中划分出压实压溶成岩相、弱压实-碳酸盐胶结相、弱压实-绿泥石膜胶结相和绿泥石膜胶结-长石溶蚀相4个成岩相带.其中,主砂体核部的弱压实-绿泥石膜胶结相和绿泥石膜胶结-长石溶蚀相的砂岩物性好、含油性好,是油气富集的有利相带.
关键词:成岩相;成岩作用;低渗透储集层;西峰油田;鄂尔多斯盆地
分类号:TE112.2 文献标识码:A
文章编号:0253-9985(2006)02-0209-09
Diagenesis of Chang 81 reservoir with low permeability in Xifeng oilfield, Ordos basin
Li Hong Liu Yiqun Liu Linyu
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基金项目:国家重点基础研究发展计划(973)项目(2003CB2146000);长江学者和创新团队计划资助项目(IRT0559)
作者简介:李红(1975-),女,博士生,油气储层地质学
作者单位:李红(西北大学,地质学系,陕西,西安,710069)
柳益群(西北大学,地质学系,陕西,西安,710069)
刘林玉(西北大学,地质学系,陕西,西安,710069)
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