王秀平,牟传龙
WANG Xiu-ping,MOU Chuan-long
摘要:
通过借助偏光显微镜、扫描电镜、阴极发光等分析测试手段,结合流体包裹体的分析测试结果,以前人的研究为依据,对苏里格气田东二区盒8段储层成岩作用和成岩相进行研究。通过对成岩序列和孔隙演化的分析,将成岩演化划分为4个阶段6个期次,其中早成岩B晚期—中成岩B早期的酸性溶蚀、溶解作用促使次生孔隙发育,是形成建设性成岩相的关键时期。综合岩石学和成岩作用特征,将苏里格气田东二区盒8段储层成岩相划分为:低孔渗净砂岩不稳定组分溶蚀相、特低孔渗净砂岩不稳定组分溶蚀—胶结相、特低孔渗净砂岩不稳定组分溶蚀—较强压实相、致密净砂岩胶结相与致密中细粒(杂)砂岩压实相5种成岩相类型,并建立了每种成岩相的测井曲线特征。通过单井成岩相分析,成岩相在垂向上表现为以下部溶蚀相,上部压实相为主的特征;在平面上表现为其分布受控于沉积相的展布。低孔渗净砂岩不稳定组分溶蚀相作为最有利的成岩相类型,呈孤岛状分布。
中图分类号:
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