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沉积学报  2015 

库车坳陷DB气田白垩系砂岩胶结作用及其与构造裂缝关系

DOI: 10.14027/j.cnki.cjxb.2015.04.014, PP. 754-763

Keywords: 胶结作用,构造裂缝,砂岩,气田,白垩系,库车坳陷

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Abstract:

以普通薄片和铸体薄片观察与鉴定为基础,辅以岩芯精细观察、阴极发光显微镜分析、扫描电镜分析、黏土矿物X衍射分析、包裹体分析、油层物性分析等技术手段,结合区域储层地质研究成果,系统研究塔里木盆地库车坳陷DB气田白垩系巴什基奇克组砂岩储层胶结作用特征及其发育期次,并剖析其与构造裂缝的关系.结果表明,DB气田白垩系砂岩为裂缝—孔隙型特低孔—特低渗储层,构造裂缝发育是储层高产的主要因素;储层胶结作用强烈,尤其以碳酸盐胶结为主,与黏土矿物转化有明显的因果关系,共发育“6Ma之前”、“6~5Ma”和“3~2Ma”三期主要的胶结作用;多期次胶结作用与该区三期构造裂缝的有效性关系密切,只有错过主要胶结作用时期的第三期(N2末)构造裂缝才是最有效的储集空间.

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