松辽盆地北部徐家围子断陷沙河子组致密气储层成岩作用与成岩相特征

doi:10.13278/j.cnki.jjuese.20190258

摘要/Abstract

摘要： 致密储层成因及有利储层分布预测是制约当前徐家围子断陷沙河子组致密气勘探的关键因素。本次研究综合运用沙河子组普通薄片、铸体薄片、扫描电镜、阴极发光、电子探针、X衍射及物性测试等多种资料，系统分析徐家围子断陷沙河子组致密砂砾岩成岩作用特征。结果表明：研究区沙河子组可划分为强压实泥质杂基充填成岩相、中压实长石岩屑溶蚀成岩相、中压实石英次生加大成岩相、中压实绿泥石环边胶结成岩相和弱压实碳酸盐胶结成岩相等5种成岩相；由沉积作用形成的碎屑矿物组分、结构差异是各成岩相成岩演化的物质基础，决定了其初始孔隙度的差异；强压实和黏土杂基充填是造成砂砾岩储层物性损失的主要原因，长石岩屑溶蚀和绿泥石环边胶结有利于物性保持和改善。不同成岩相中成岩作用类型和强度各不相同导致不同成岩相间宏观物性和微观孔隙结构差异，其中中压实长石岩屑溶蚀成岩相和中压实绿泥石环边胶结成岩相是沙河子组储层最有利的成岩相带。

关键词: 成岩作用, 致密砂岩, 孔隙演化, 沙河子组, 徐家围子断陷

Abstract: The genesis and distribution of tight sandstones are the key factors that restrict the exploration of tight gas in Shahezi Formation. We studied the diagenetic characteristics of tight sandstones in Shahezi Formation and divided it into 5 kinds of diagenetic facies according to the multiple qualitative and quantitative parameters and on the basis of making full use of core, thin-section, SEM, physical properties and X-ray analysis. They are strongly compacted argillaceous filling facies, moderately compacted feldspar detritus dissolution facies, moderately compacted quartz secondary enlargement facies, moderately compacted chlorite rim cementation facies, and weakly compacted carbonate cementation facies. The different mineral constituent and texture of clastic rocks controlled by sedimentation are the material basis and origin of porosity evolution of different diagenetic facies, the compaction and filling of matrix are the material cause that lead to the loss of porosity in early diagenetic system, and the physical properties are retained and improved by the chlorite rim cementation and feldspar detritus dissolution. The type and intensity of diagenesis are different in different diagenetic facies, which results in the difference of macro properties and micro pore structures. The moderately compacted chlorite rim cementation facies and moderately compacted feldspar detritus dissolution facies show the best reservoir quality in Shahezi Formation, which can be taken as the best future exploration target in the study area.

Key words: diagenesis, tight sandstone, porosity evolution, Shahezi Formation, Xujiaweizi falut depression

中图分类号:

P618.13

张大智, 初丽兰, 周翔, 王晓莲, 李鑫. 松辽盆地北部徐家围子断陷沙河子组致密气储层成岩作用与成岩相特征[J]. 吉林大学学报(地球科学版), 2021, 51(1): 22-34.

Zhang Dazhi, Chu Lilan, Zhou Xiang, Wang Xiaolian, Li Xin. Diagenesis and Diagenesis Facies of Tight Gas Reservoir of Shahezi Formation, in Xujiaweizi Fault Depression of North Songliao Basin[J]. Journal of Jilin University(Earth Science Edition), 2021, 51(1): 22-34.

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