Micro-Pore Characteristics and Influencing Factors of Fengcheng Formation Shale in Well Maye-1

doi:10.7657/XJPG20220101

Abstract

Abstract:

Less researches have been carried out on the microscopic pore characteristics of the Fengcheng formation shale in the Mahu sag. In order to determine the influence of pores on the occurrence and enrichment of shale oil, taking Well Maye-1 in the northwestern slope of the Mahu sag as a case, the characteristics of nano-pores and influencing factors in the continental shale were analyzed through X-ray diffraction, SEM, liquid nitrogen adsorption, high-pressure mercury intrusion, etc. The shale in the Fengcheng formation is mainly composed of felsic rock and carbonate rock. In the two kinds of rocks, the types, shapes and sizes of the pores are almost similar. There are inorganic pores, organic pores and micro-fractures, of which dissolution pores and micro-fractures are dominant. In addition, there are parallel plate-shaped fractures, wedge-shaped pores and ink-bottle-shaped pores. The pores are mainly small ones. The distribution of the pore size shows three peaks and the main peak ranges from 30 nm to 60 nm, and the pore connectivity is poor. The porosity of the felsic rock is higher than that of the carbonate rock, and macro-pores develop better in the felsic rock. So the felsic rock is more favorable for exploration. Quartz, feldspar and dolomite are controlling factors on pore development, and they have a balanced contribution to the pores of various sizes. Clay minerals are favorable for the development of micropores and small pores, but have a weaker impact on mesopores. Organic matter has a little effect on pore development. Both inorganic minerals and organic matter are favorable factors for the increase of shale porosity.

Key words: Mahu sag, Well Maye-1, Fengcheng formation, shale, microscopic pore, influencing factor, lithofacies, mineral composition

CLC Number:

TE122.23

YANG Fan, MENG Xin, WANG Xianhu, YU Peirong, SHAO Guanghui, CHEN Huohong. Micro-Pore Characteristics and Influencing Factors of Fengcheng Formation Shale in Well Maye-1[J]. Xinjiang Petroleum Geology, 2022, 43(1): 1-10.

Figures/Tables 10

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