reservoirs in marginal reefs of carbonate tableland

Abstract

Abstract: In Junngar Basin, a series of large anticliens and faulted anticlinal structures are developed in Carboniferous and Lower Permian in Mahu sag and its periphery. They are distributed at the center of of high-quality hydrocarbon kitchen of the Lower Permian Fengcheng Formation and its perihery in Mahu sag, where the conditions of resrvoir formation superior, so they are important exploration areas of deep oil and gas in Junggar Basin. Due to the deeper burial depth of these structures, however, the exploration and development potential in these areas is mainly affected by the following two aspects. The first is whether effetive reservoirs are developed in a large scale in the target layers. And the second is whether it is gas-phase hydrocarbon. It is indicated from comprehensive analysis of aeromagnetic anomaly processing and interpretation, seismic horizon velocity analysis, source rock evolution and natural gas genetic classification that volcanic weathering crust reservoirs are developed at Mabei anticline, Well Da 1 anticline and central-northern Mahu anticline. Based on evolution stages of Fengcheng Formation source rocks, spatial locations of anticlinal structures and oil cracking depth, it is predicted that the hydrocarbon phase is kerogencracking gas in Mabei and Mahu anticlines, oil-gas paragenesis in Well Da 1 anticline and dominantly gas in Manan anticline.

Key words: hydrocarbon phase, Junggar Basin, Mahu sag, discordogenic structure, effective reservoirs, hydrocarbon phase, Junggar Basin, Mahu sag, discordogenic structure, effective reservoirs

Wei Yanzhao, Chen Gangqiang, Wang Feng, Bian Baoli, Wu Aicheng, Yang Fan, Yang Chun, Yang Hui. reservoirs in marginal reefs of carbonate tableland[J]. China Petroleum Exploration, 2016, 21(1): 53-60.

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