摘要
通过对川西坳陷新场气田上三叠统须家河组须四段和须二段储集层成岩作用类型及其特征的研究,认为储集层主要经历了压实压溶作用、自生矿物胶结作用和溶蚀作用3种成岩作用类型。储集层成岩-储集相可以划分成5种,即强溶蚀成岩-储集相、绿泥石衬边粒间孔成岩-储集相、压实压溶成岩-储集相、碳酸盐胶结成岩-储集相和石英次生加大成岩-储集相。不同的储集层成岩-储集相由于经历了不同的成岩演化序列,使得储集层中的残余原生粒间孔和次生溶孔的形成条件各不一样,储集层中孔隙的保存主要决定于孔隙被压实、自生矿物的充填、多期的溶蚀作用等因素,并与孔隙中发育的绿泥石衬边有紧密联系。在上述5种成岩-储集相中,有效的成岩-储集相只有2种,即强溶蚀成岩-储集相和绿泥石衬边粒间孔成岩-储集相,它们对须家河组须四段和须二段优质储集层的形成起着至关重要的作用,而其他几种成岩-储集相对优质储集层的形成是无效的。
Based on the studies of reservoir diagenesis types and their characteristics of the Members 4 and 2 of the Upper Triassic Xujiahe Formation in the Xinchang Gasfield, it is concluded that the reservoir diagenesis mainly includes the pressolution, the authigenic mineral cementation and the dissolution. The diagenetic-reservoir facies is divided into 5 types, namely as, the intense dissolution diagenetic-reservoir facies, the chlorite lining intergranular pore diagenetic-reservoir facies, the pressolution diagenetic-reservoir facies, the carbonate cementation diagenetic-reservoir facies and the quartz secondary overgrowth diagenetic-reservoir facies. The formation conditions of the relic primary intergranular pores and secondary dissolution pores in the reservoirs are different due to their different diagenetic evolutionary sequences. The preservation of pores in reservoir is mainly controlled by the compaction of pores, the filling of authigenic minerals and the multi-stages dissolution, as well as the chlorite lining developed in the pores. The effective diagenetic-reservoir facies of the 5 types are respectively the intense dissolution diagenetic-reservoir facies and chlorite lining intergranular pore diagenetic-reservoir facies. They play an important role in the formation of the reservoir of the Members 4 and 2 of the Xujiahe Formation, while the other diagenetic reservoir facies are ineffective for the formation of high quality reservoir.
出处
《古地理学报》
CAS
CSCD
2008年第5期447-458,共12页
Journal of Palaeogeography：Chinese Edition
基金
中国石油天然气集团公司石油科技中青年创新基金(编号:07E1002)资助
关键词
川西坳陷
新场气田
上三叠统
须家河组
低渗储集层
成岩-储集相
western Sichuan Depression, Xinchang Gasfield, Upper Triassic, Xujiahe Formation, low-permeable reservoir, diagenetic-reservoir facies
