吉林大学学报(地球科学版) ›› 2019, Vol. 49 ›› Issue (2): 294-309.doi: 10.13278/j.cnki.jjuese.20170274
李欢, 王清斌, 庞小军, 冯冲, 刘晓健
Li Huan, Wang Qingbin, Pang Xiaojun, Feng Chong, Liu Xiaojian
摘要: 研究砂砾岩储层成岩演化及优质储层成因机理对中深层油气勘探意义重大。综合运用铸体薄片、扫描电镜、泥岩X衍射(黏土和全岩)、包裹体、常规测井、核磁共振测井和埋藏史等资料,系统研究了渤海湾盆地辽东凹陷旅大29构造沙二段砂砾岩体成岩演化、裂缝特征及作用、优质储层成因及控制因素等内容。结果表明:沙二段储层处于欠压实带、弱胶结、局部溶蚀增孔以及非构造缝的发育,是形成优质储层的成因;沙二段砂砾岩发育原生缝和成岩缝两类裂缝,原生缝提供了重要的储集空间,裂缝极大改善了储层的孔隙结构和物性;源-汇过程控制了原生缝形成,贫K+泥岩与砾石原生缝的组合促进了构造抬升过程中收缩缝的形成,而缺少Ca2+、Mg2+、Fe2+、Fe3+等离子的岩石组分使大面积胶结物难以出现,保留了孔缝的有效性。对储层孔隙演化进行了恢复,认为沙二段储层在演化为低孔储层后才成藏。
中图分类号:
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