Characteristics and exploration potential of Jurassic oil and gas reservoirs in Mahu sag of the Junggar Basin

doi:10.3969/j.issn.1672-7703.2019.03.007

Abstract

Abstract: Many wells have achieved new breakthrough in Jurassic in Mahu sag of the Junggar Basin. The characteristics and favorable conditions of Jurassic hydrocarbon accumulation in Mahu sag were studied systematically based on the geological, core, experimental analysis and seismic data of existing exploration wells. Then, based on the main factors controlling hydrocarbon accumulation, the favorable areas for hydrocarbon accumulation were predicted. Finally, the following exploration directions and deployment suggestions of Jurassic in Mahu sag were proposed. It is indicated that two kinds of oil and gas reservoirs (i.e., primary and secondary oil and gas reservoirs) are developed in Jurassic in Mahu sag, and secondary faulted block and fault-lithologic oil and gas reservoirs are dominant. The oil reservoirs are characterized by small burial depth, moderate thickness and moderate physical properties. The conditions of fault controlling migration, nose-like salient controlling accumulation, sufficient sources and developed reservoirs are favorable for Jurassic hydrocarbon accumulation in Mahu sag. It is concluded from the comprehensive evaluation that the favorable areas for the Jurassic oil and gas reservoirs in Mahu sag are mainly distributed in the nose-like salient developed in the slope around the sag and they are superimposed with the favorable areas of the principal producing formations in Permian and Triassic, Mahu sag. It is recommended to take Jurassic as the shallow efficient field for concurrent exploration.

Key words: Junggar Basin, Mahu sag, Jurassic, oil reservoir characteristics, exploration potential

CLC Number:

Song Tao, Huang Fuxi, Wang Shaoyong, Yang Fan, Lv Weining, Liu Ce, Jia Peng, Fan Jingjing. Characteristics and exploration potential of Jurassic oil and gas reservoirs in Mahu sag of the Junggar Basin[J]. China Petroleum Exploration, 2019, 24(3): 341-350.

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