Differences and Genesis of Upper Wuerhe Formation Reservoirs in Mahu Sag and Shawan Sag

doi:10.7657/XJPG20230103

Abstract

Abstract:

By means of thin section observation，scanning electron microscope (SEM) analysis，X-ray diffraction (XRD) analysis of clay minerals，and cathodoluminescence experiment，the diagenesis of the Upper Permian upper Wuerhe formation in the Mahu and Shawan sags in the Junggar basin were analyzed and compared，and the types of diagenetic products and pore evolution process were clarified. Compaction，carbonate mineral cementation and zeolite cementation are the main factors controlling the differences in reservoir physical properties in the study area. The compaction in the Mahu sag is relatively weak，while the dissolution in the Shawan sag is relatively strong. There are differences in diagenesis and pore evolution of sand bodies in the two sags. The reservoirs in the Mahu sag are dominated by feldspar particles and dissolved tuff debris pores，and the reservoirs in the Shawan sag are dominated by feldspar particles，dissolved tuff debris pores，and dissolved zeolite pores. There are a few primary pores developed in the reservoirs in both Mahu sag and Shawan sag. The differences between the reservoirs in the two sags are mainly caused by the different properties of diagenetic fluids and rock components. Specifically，the rock components represent the main cause for the differences in pore structure characteristics in the sandy conglomerate reservoirs in the Mahu sag and the Shawan sag.

Key words: Junggar basin, Mahu sag, Shawan sag, upper Wuerhe formation, reservoir characteristic, differential genesis, diagenesis, diagenetic evolution

CLC Number:

TE122

KUANG Hao, ZHOU Runchi, WANG Junmin, LIU Hao, TAN Xianfeng, CAI Xinyong, XIAO Zhenxing. Differences and Genesis of Upper Wuerhe Formation Reservoirs in Mahu Sag and Shawan Sag[J]. Xinjiang Petroleum Geology, 2023, 44(1): 18-24.

Figures/Tables 5

References 27

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