天然气地球科学 ›› 2022, Vol. 33 ›› Issue (10): 15971610.doi: 10.11764/j.issn.1672-1926.2022.06.007
陈少云1(),杨勇强1,2(),邱隆伟1,2,王小娟3,关旭3,梁炜煜1,刘剑忠1
Shaoyun CHEN1(),Yongqiang YANG1,2(),Longwei QIU1,2,Xiaojuan WANG3,Xu GUAN3,Weiyu LIANG1,Jianzhong LIU1
摘要:
四川盆地中部地区侏罗系沙溪庙组浅水三角洲砂体是致密气勘探的重要领域,有利储层的成因是制约高效勘探的关键问题。综合岩心和薄片资料,采用扫描电镜、阴极发光和地球化学等测试手段分析了沙溪庙组成岩演化序列,从沉积和成岩两方面探讨了储层的控制因素。沙溪庙组储层以长石砂岩为主,平均孔隙度、渗透率分别为10.34%、1.75×10-3 μm2,属于(中)低孔—低渗储集层。储层总体处于中成岩 A 期,依次经历了早期绿泥石形成、长石早期溶蚀→方解石、浊沸石沉淀→有机酸溶蚀、贴粒缝形成、钠长石形成→浊沸石溶蚀→石英溶蚀、晚期方解石、浊沸石、绿泥石充填的成岩过程。高能环境中沉积的水下分流河道砂体粒度粗、杂基少是优质储层形成的有利微相。压实作用、胶结作用是2种主要的减孔机制,浊沸石与自生绿泥石对储层物性的影响有着两面性。原生孔隙大量保存、溶蚀作用强烈,胶结作用弱等多方面制约着优质储层的发育,且原生孔隙的保存与绿泥石薄膜有关。浊沸石胶结物充填导致储层孔隙度较低,大量微裂缝的出现是提高砂体渗透率的关键。
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