Main Controlling Factors and Gas Enrichment Area Selection of Ma55 Gas Reservoir in Eastern Sulige Gas Field

doi:10.7657/XJPG20220303

Abstract

Abstract:

In order to improve the drilling rate of pay zones in the Ma5₅ gas reservoir in eastern Sulige gas field, Ordos basin, using the drilling, logging, core and gas production testing data, and analyzing the main factors controlling pay zones such as sedimentary microfacies, diagenesis and paleotopography, the distribution law of dolomite in the Ma5₅ gas reservoir was clarified. Moreover, the reservoirs were comprehensively classified and evaluated, and the favorable gas enrichment areas in the Ma5₅ gas reservoir were selected. The research results show that the pay zones in the Ma5₅ reservoir are distributed as “lens” in local areas, with poor continuity. The most favorable reservoir rocks are granular dolomite and coarse powder crystalline dolomite, and the main storage space consists of intergranular pores, intergranular dissolved pores and structural fractures. Sedimentary facies and diagenesis are the main controlling factors of the Ma5₅ reservoir, and the grain beach is the most favorable sedimentary microfacies of the Ma5₅ dolomite. The pay zones are mainly controlled by quasi-contemporaneous dolomitization and buried dolomite diagenesis. The paleoslope on the relatively high position is a favorable area for the development of the Ma5₅ gas reservoir.

Key words: Ordos basin, Sulige gas field, Ordovician, Majiagou formation, sedimentary microfacies, diagenesis, paleotopography, reservoir

CLC Number:

TE122.221

BAI Hui, YANG Tebo, HOU Kefeng, MA Zhixin, FENG Min. Main Controlling Factors and Gas Enrichment Area Selection of Ma5₅ Gas Reservoir in Eastern Sulige Gas Field[J]. Xinjiang Petroleum Geology, 2022, 43(3): 271-277.

Figures/Tables 6

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Main Controlling Factors and Gas Enrichment Area Selection of Ma5₅ Gas Reservoir in Eastern Sulige Gas Field

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