济阳坳陷义和庄—大王庄地区二叠系储集层成岩作用及孔隙演化

doi:10.7657/XJPG20210604

摘要/Abstract

摘要：

济阳坳陷二叠系上石盒子组油气资源十分富集,为丰富砂岩储集层孔隙成因的认识,以济阳坳陷义和庄—大王庄地区二叠系上石盒子组砂岩储集层为例,利用岩心观察、薄片鉴定、扫描电镜、阴极发光、电子探针及孔渗测试等,对储集层成岩作用及孔隙成因进行深入探讨。认为济阳坳陷义和庄—大王庄地区二叠系上石盒子组砂岩储集层整体为低孔低渗储集层,通过对研究区储集层成岩作用定量研究,明确储集层压实作用与胶结作用强度都以中等到强为主,不同取心井略有不同,但总体上压实作用为储集层孔隙破坏主要因素,胶结作用为储集层孔隙破坏的次要因素。通过分析储集层孔隙演化差异性,将研究区储集层总体上分为“先破坏,再溶蚀”和“破坏后,未溶蚀”2种类型,前者储集层物性明显较好,形成济阳坳陷义和庄—大王庄地区二叠系砂岩储集层甜点段,得益于发育广泛的裂缝与凝灰质杂基溶蚀,其形成的次生孔隙保存较好;后者储集层物性较差,缺少裂缝沟通,可溶物质未发生大规模溶蚀,次生孔隙发育差。

关键词: 济阳坳陷, 二叠系, 上石盒子组, 凝灰质溶蚀, 成岩作用, 压实作用, 胶结作用, 孔隙演化

Abstract:

The Permian Shangshihezi formation in the Jiyang depression has rich oil and gas resources. To understand the diagenesis and pore evolution of the sandstone reservoir, many means like core observation, thin section identification, scanning electron microscope, cathodoluminescence, electron probe and porosity and permeability test are used. The results show that the sandstone reservoir of the Permian Shangshihezi formation in Yihezhuang-Dawangzhuang area in the Jiyang depression is of low porosity and low permeability. The compaction and cementation to the reservoir is medium to strong, which have been confirmed by quantitative study on the diagenesis in the study area. Generally, compaction is the primary factor in destructing the reservoir pores and cementation is the secondary factor. Analysis of the difference in the reservoir pore evolution divides the reservoirs generally into two types. The first type is the reservoir which was “first destroyed and then dissolved”. The second type is the reservoir which is “destroyed but not dissolved”. The reservoir of the first type has better physical properties and sweet spot intervals are found in the Permian sandstone reservoirs in the Yihezhuang-Dawangzhuang area of the Jiyang depression due to extensively developed fractures, dissolved tuffaceous matrix and well-preserved secondary pores. In comparison, the reservoir of the second type has worse physical properties shown as less fractures, not dissolved soluble matrix, and poorly developed secondary pores.

Key words: Jiyang depression, Permian, Shangshihezi formation, dissolved tuffaceous matrix, diagenesis, compaction, cementation, pore evolution

中图分类号:

TE122.23

王晔磊, 邱隆伟, 杨勇强, 吴宛秋, 杨保良, 乔雨鹏. 济阳坳陷义和庄—大王庄地区二叠系储集层成岩作用及孔隙演化[J]. 新疆石油地质, 2021, 42(6): 676-682.

WANG Yelei, QIU Longwei, YANG Yongqiang, WU Wanqiu, YANG Baoliang, QIAO Yupeng. Diagenesis and Pore Evolution of Permian Reservoirs in Yihezhuang-Dawangzhuang Area, Jiyang Depression, Bohai Bay Basin[J]. Xinjiang Petroleum Geology, 2021, 42(6): 676-682.

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