天然气地球科学 ›› 2022, Vol. 33 ›› Issue (2): 233242.doi: 10.11764/j.issn.1672-1926.2021.08.018
Jiaying YANG1(),Youlu JIANG1(),Guogang CAI2,Chengjin ZHAO1,Dongwei ZHANG2
摘要:
辽河坳陷东部凹陷牛居—长滩洼陷深层沙三上亚段沉积体系复杂、储层横向变化大,深层探井少,储层成岩作用研究程度较低。利用铸体薄片、扫描电镜、X?射线衍射、流体包裹体等多种技术手段,对沙三上亚段储层性质、成岩演化特征进行了分析,划分了成岩相类型,并对比了不同类型储层成岩差异演化过程。结果表明,沙三上亚段储层岩性为中—细粒岩屑砂岩,以低孔、特低渗为主,储集空间主要为次生溶蚀孔隙,储层经历了压实减孔、早期胶结减孔、有机酸溶蚀增孔、晚期胶结减孔4个阶段。不同类型储层成岩演化过程具有明显差异,强压实相和强钙质胶结相砂岩致密化时间最早,中等成岩相砂岩次之,强溶蚀相砂岩最晚。强压实相和强钙质胶结相砂岩受高杂基含量和高碳酸盐胶结含量的影响,成岩早期孔隙度快速减少,导致晚期有机酸溶蚀的范围和强度有限;而强溶蚀相砂岩由于早期压实程度相对较弱,保留一定粒间孔隙,受有机酸溶蚀作用的影响较大,储层物性得到良好改善。
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