岩性油气藏 ›› 2021, Vol. 33 ›› Issue (4): 2940.doi: 10.12108/yxyqc.20210404
柴毓1, 王贵文2, 柴新3
CHAI Yu1, WANG Guiwen2, CHAI Xin3
摘要: 为了研究四川盆地金秋区块三叠系须二段储层非均质性及成因,以分析其微观驱替效率和剩余油分布、制定合理的开发方案、提高开发效率,开展了岩心观察、薄片鉴定、扫描电镜分析、压汞测试、核磁共振和常规测井分析等。结果表明:①四川盆地金秋区块三叠系须二段在多期构造运动和后期成岩改造作用下,孔隙类型多样、喉道普遍较细,孔喉结构和物性在各地区表现出较大的差异性,非均质性强。②须二段储层储集空间以次生孔隙为主,原生孔隙较少,表明沉积物进入埋藏成岩环境后,主要受后期成岩作用、成岩环境和成岩演化阶段的影响,形成了现今储层非均质性强的特点,并根据成岩作用类型、强度和对储层物性的建设或破坏作用将须二段储层划分为4种成岩相类型。③须二段储层物性和非均质性受构造、沉积、成岩作用共同影响,特定构造和沉积背景为储层非均质性的形成奠定了基础,溶蚀、破裂作用等建设性成岩作用及其强度是决定储层非均质性的关键因素。该研究成果可为四川盆地金秋区块三叠系须二段油气勘探提供借鉴。
中图分类号:
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