PANG Jun-gang, YANG You-yun, TIAN Jian-feng, SHANG Xiao-qing, LI Sai, CHEN Chong, HUANG Xi-yan, ZHANG Chen

School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710065, China

Abstract: The Chang 63 sub-member of the Yangchang Formation is a typical tight sandstone reservoir in the Huaqing Area, Ordos Basin, and it is important to study its formation mechanism and distribution rule of reservoir from the aspects of diagenesis for oil exploration and development. Based on the analyses of provenance and sedimentary facies as well as the data of the cast slice and other tests, it showed that the diagenetic processes mainly include cementation, compaction and dissolition in this area. The analyses included distribution relations between planar distributions of typical diagenetic products, the relationship of diagenetic products with the distribution of primary intergranular pores and dissolved pores, and the causes of diagenetic products. Based on above analyses of the single factor of diagenetic products, it was divided into such seven diagenesis facies of chlorite film cementation residual intergranular pore, and so on. The analysis result, of physical properties of different diagenetic facies, shows that the physical property of chlorite film cementation-residual intergranular pore, chlorite cement intergranular-dissolved pore are best.

Keywords: single factor diagenesis facies Huaqing Area Ordos Basin Yanchang Formation

*Corresponding Author, E-Mail: yyyang@xsyu.edu.cn

Bulletin of Mineralogy, Petrology and Geochemistry Vol. 34, No.2, 2015, page 369-378