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0 20221013 - 20221013

DOI: https://doi.org/10.11698/PED.20220103

Characteristics, origin and controlling effect on hydrocarbon accumulation of overpressure in foreland thrust belt of southern margin of Junggar Basin, NW China

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  • 1. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China;
    2. Key Laboratory of Basin Structure and Hydrocarbon Accumulation, CNPC, Beijing 100083, China;
    3. School of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an 710065, China

Received date: 2022-02-09

  Revised date: 2022-06-10

  Online published: 2022-07-27

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Abstract

Abnormal high pressure is common in the foreland thrust belt in the southern margin of Junggar Basin. Analysis of the overpressure development patterns in the main formations especially in the middle and lower assemblages, and its controlling effects on the formation and distribution of hydrocarbon accumulations is of important guiding significance for petroleum exploration. Based on the measured formation pressure, mud weight, and well logging data, overpressure origin identification and overpressure evolution simulation techniques are used to analyze the vertical and lateral distribution patterns of overpressure, genetic mechanisms of overpressure in different structural belts and causes of the differential distribution of overpressure, and the controlling effects of overpressure development and evolution on the formation and distribution of oil and gas reservoirs. The research shows that overpressure occurs in multiple formations in the southern Junggar foreland thrust belt, the deeper the formation, the bigger the scale of the overpressure is. Laterally, overpressure is least developed in the mountain front belt, most developed in the fold anticline belt, and relatively developed in the slope belt. The differential distribution of overpressure is mainly controlled by the differences in disequilibrium compaction and tectonic compression strengths of different belts. The vertical overpressure transmission caused by faults connecting the deep overpressured system has an important contribution to the further increase of the overpressure strength in this area. The controlling effect of overpressure development and evolution on hydrocarbon accumulation and distribution shows in the following aspects: overpressure maintains the physical properties of deep reservoirs to some extent, expanding the exploration depth of deep and ultra-deep reservoirs; reservoirs below the E2-3a and K1tg overpressure mudstone cap rocks are main sites for oil and gas accumulation; under the background of overall overpressure, both overpressure strength too high or too low are not conducive to hydrocarbon enrichment and preservation, and the pressure coefficient between 1.6 and 2.1 is the best.

Key words： abnormal high pressure; overpressure origin; tectonic compression; overpressure transmission; hydrocarbon accumulation; foreland thrust belt; Junggar Basin

Cite this article

LU Xuesong, ZHAO Mengjun, ZHANG Fengqi, GUI Lili, LIU Gang, ZHUO Qingong, CHEN Zhuxin . Characteristics, origin and controlling effect on hydrocarbon accumulation of overpressure in foreland thrust belt of southern margin of Junggar Basin, NW China[J]. Petroleum Exploration and Development, 0 : 20221013 -20221013 . DOI: 10.11698/PED.20220103

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