Strategic breakthrough in Gaoquan anticline and exploration assessment on lower assemblage in the southern margin of Junggar Basin

doi:10.3969/j.issn.1672-7703.2019.02.001

Abstract

Abstract: The southern margin of the Junggar Basin is a strategic successor for oil and gas exploration, and the strategic breakthrough in exploration well Gao 1 further proved the promising future of the lower assemblage in the southern margin. According to the results of sectional structural modeling, structural analysis of the trap and the matching between accumulation conditions, the controlling factors of hydrocarbon accumulation in the lower assemblage was identified. The study results indicate (1) the lower Jurassic is primary source rock which has a large potential; the Cretaceous Qingshuihe Formation, Jurassic Toutunhe Formation and Khalza Formation are effective reservoirs with a certain scale; and the regional thick mudstone of the Cretaceous Tugulu Group at higher pressure is effective caprock with good sealing ability; (2) static elements (i.e. source, reservoir and cap rocks and traps) matched well in space, and dynamic elements matched well in time:the traps developed earlier, the forming of the structure was well consistent with the generating of hydrocarbon, later reconstruction was weak and the preservation conditions were good, which are good conditions for large-scale accumulation. Base on the comprehensive analysis above,near-source anticlinal traps, such as the Tugulu anticline, the Hutubi anticline and the Dongwan anticline, are proposed to make breakthrough to gas exploration in the southern margin of the Junggar Basin.

Key words: southern margin of Junggar Basin, lower assemblage, anticline, accumulation condition, exploration breakthrough

CLC Number:

He Haiqing, Zhi Dongming, Lei Dewen, Yang Disheng, Xiao Lixin, Yuan Bo, Qi Xuefeng, Zhao Jinyong. Strategic breakthrough in Gaoquan anticline and exploration assessment on lower assemblage in the southern margin of Junggar Basin[J]. China Petroleum Exploration, 2019, 24(2): 137-146.

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