岩性油气藏 ›› 2024, Vol. 36 ›› Issue (2): 136146.doi: 10.12108/yxyqc.20240213
张文播1, 李亚2, 杨田1, 彭思桥2, 蔡来星1, 任启强1
ZHANG Wenbo1, LI Ya2, YANG Tian1, PENG Siqiao2, CAI Laixing1, REN Qiqiang1
摘要: 火山碎屑岩油气藏作为重要的非常规油气藏,对油气增储上产具有重要的意义。通过岩心观察,综合薄片鉴定、QEMSCAN扫描、X射线衍射、物性分析、包裹体测温及碳氧同位素分析等资料,系统分析了四川盆地简阳地区二叠系火山碎屑岩储层特征及其成岩演化过程。研究结果表明:①简阳地区二叠系火山碎屑岩储层岩石类型主要包括火山角砾熔岩、凝灰熔岩和熔结火山角砾岩,整体物性都较好,孔隙度为0.78%~32.00%,平均为16.67%,渗透率为0.001~2.680 mD,平均为0.125 mD,属于高孔低渗储层,储集空间以次生孔隙和裂缝为主,包括脱玻化孔、基质溶蚀孔及溶蚀缝等类型。②研究区发育多种成岩作用,主要有熔结、压实、脱玻化、胶结及溶蚀作用等。③研究区经历了同生成岩、表生成岩与埋藏成岩3个阶段,成岩演化受深部热液、大气淡水及有机酸流体的共同影响,一方面流体活动造成热液矿物或碳酸盐胶结物的沉淀对储层物性起破坏性作用;另一方面热液流体促进油气运移,酸性流体的溶蚀改造作用对储层孔隙发育起建设性作用。
中图分类号:
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