Pore Structure and Acoustic Characteristics of Shaximiao Formation in Sichuan Basin Citation: Zhao
Zhao Dan*, Zhang Qingxiu, Guo Jingshu, Li Gang and Zeng Shuti
Published: August 19, 2022
Abstract
With the deepening of exploration and development, the natural gas development in Sichuan Basin has entered the stage of tight gas exploitation. There are significant differences between tight gas and conventional natural gas resources, which are embodied in more complex pore structure and lithology. These differences make it difficult to predict the “dessert” development area of tight rocks. Therefore, it is necessary to study the pore structure characteristics, petrophysical characteristics and formation fluid of tight sandstones. In this paper, through CT scanning and thin section identification, the characteristics of rock micro pore structure in Qiulin area are found, and the petrophysical characteristics of tight rock reservoirs are found through P-S wave experiments. The research shows that the pores of Shaximiao Formation in Qiulin area are large, with pore diameter distribution of 0.05~0.5mm and the pores are relatively developed, with an average porosity of more than 10%. The study of rock physical properties shows that dense rock Poisson is higher than conventional carbonate rock and shale, and has the characteristics of low acoustic wave velocity and low Young’s modulus.