Reservoir characteristics of Chang 2 Member of Yanchang Formation in Area A, Ordos Basin

¹ Zhidan Oil Production Plant, Shaanxi Yanchang Petroleum (Group) Co. Ltd., Yan’an, Shaanxi, 716000, China
² Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, XiJing University, Xi’an, Shaanxi, 710123, China

^* Corresponding author: 20190100@xijing.edu.cn

Abstract

With the continuous enhancement of exploration and development in the Ordos Basin, in-depth research has been carried out on the petrological and reservoir characteristics of Chang 2 reservoir in Area A, which provides a geological basis for the efficient development of oil reservoirs. Comprehensive use of reservoir sandstone thin section identification casting analysis, mercury intrusion analysis, logging analysis and other methods to systematically study the petrological characteristics, pore characteristics and reservoir physical properties of Chang 2 reservoir in Area A. The results show that the reservoirs in the study area are dominated by fine-grained sandstones, with low component maturity and high structural maturity. They are all medium-low porosity, low-permeability and ultra-low permeability reservoirs. Primary intergranular pores and residual intergranular pores are developed, the reservoir drainage pressure is low, which is good-medium, and the mercury removal efficiency is high, indicating that the reservoir has good storage performance and seepage properties.