歧口凹陷歧北斜坡沙三段成岩作用及其对储层影响分析

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根据常规薄片、铸体薄片、扫描电镜、X-衍射、阴极发光等资料分析,对歧口凹陷歧北斜坡沙三段岩石学特征、成岩作用类型、成岩阶段划分及其对孔隙的影响进行了研究。结果表明:研究区沙三段储层岩石类型为长石岩屑砂岩、岩屑长石砂岩。现今主要处于早成岩 B 期、中成岩期,部分埋深较大地区进入晚成岩期。经历的成岩作用有压实作用、胶结作用、交代作用、溶蚀作用、破裂作用。其中,压实作用、胶结作用是主要的破坏性成岩作用,而溶蚀作用是主要的建设性成岩作用,特别对长石、岩屑和碳酸盐胶结物的溶蚀是储层物性变好的重要的成岩控制因素。
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