1 China University of Petroleum（Beijing）, Beijing 102249
2 State Key Laboratory of Petroleum Resource and Prospecting ,China University of Petroleum( Beijing）, Beijing 102249
3 Research Institute of Exploration and Development, SINOPEC Southwest Company,Chengdou 610016,Sichuan
Abstract Based on the studies of reservoir diagenesis types and their characteristics of the Members 4 and 2 of Upper
Triassic Xujiahe Formation in 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 lape 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 conditione of the relic primary intergranular pores and secondary dissolution pores in the reservoirs are different due to tneir different diagenetic evolutionary sequences. The preservation of pores in reservoir is mainly controlled by the burial, compaction, filling of authegenic minerals and the multi-stages dissolution, as well as the chlorite laping developed in the pores. The effective diagenetic-reservoir facies in the 5 types are respectively the intense dissolution diagenetic-reservoir facies and chlorite lape intergranular pore diagenetic-reservoir facies. They play an important role in the formation of the reservoir of Members 4 and Member 2 of Xujiahe Formation , while the other diagenetic facies are ineffective for the high quality reservoir formation.
About author: Xu Zhangyou,born in 1964,is an associate professor. He obtained his Ph.D.degree from China University of Petroleum(Beijing) in 1997 and is mainly engaged in studies of reservoir geology and reservoir description.tel:010-89731949;E-mail:xzy@cup.edu.cn.
Cite this article:
. Diagenetic-reservoir facies and their evolutionary sequences of the Upper Triassic Xujiahe Formation in Xinchang Gasfield, estern Sichuan Depression[J]. JOURNAL OF PALAEOGEOGRAPHY, 2008, 10(5): 447-458.
. Diagenetic-reservoir facies and their evolutionary sequences of the Upper Triassic Xujiahe Formation in Xinchang Gasfield, estern Sichuan Depression[J]. JOPC, 2008, 10(5): 447-458.
