Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (3): 59-72.doi: 10.12108/yxyqc.20250306

• PETROLEUM EXPLORATION • Previous Articles    

Hydrocarbon accumulation conditions and exploration potential of Triassic Baikouquan Formation in Shawan Sag，Junggar Basin

DENG Gaoshan, DONG Xuemei, YU Haitao, ZHANG Jie, YUE Xiwei, REN Junmin, JIANG Tao   

  1. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Urumqi 830013, China
  • Received:2024-08-23 Revised:2024-12-27 Published:2025-05-10

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Abstract: Based on TOC testing，rock pyrolysis，casting thin section，scanning electron microscope analysis， the source rocks，reservoirs and hydrocarbon accumulation conditions of Shawan Sag in Junggar Basin were comprehensively studied. The results show that：（1）Triassic Baikouquan Formation in Shawan Sag of Junggar Basin is a gentle slope shallow water retrograding fan delta deposits，and develops two types of favorable sand bodies：fan delta front sand body and shore shallow lake facies coastal sand dam sand body，with the distribution characteristics of horizontal connection and vertical superposition. The lithology is a positive cycle of “coarse at the bottom and fine at the top”. The overall physical properties of the reservoir are ultra-low to low porosity permeability，with an average porosity of 7.8% and an average permeability of 2.38 mD. The physical properties gradually improve from bottom to top，the third member of Baikouquan Formation are with the best physical properties，obviously controlled by sedimentary facies. Moreover，the inhibition of cementation by chlorite cladding，the porosity enlargement by albite dissolution，and the overpressure formed by continuous hydrocarbon injection all have important effects on the development of high-quality reservoirs.（2）Baikouquan Formation reservior has continuous hydrocarbon injection from multiple sets of source rocks（mainly of high-quality source rocks in salt lakes of Fengcheng Formation）. The source-reservoir configuration type can be clasified as vertical configuration and lateral configuration，and their tightness controls the degree of oil and gas enrichment. The subfacies reserviors of fan delta front are widely distributed，with a large area and porosity mostly greater than 15%. It also develops efficient transport system such as high-angle deep faults，unconformity surface，sand body. The overlying regional cap rocks provide superior reservoir conditions.（3）A series of nose-bulges developed along NW direction，close to the source，are favorable structure exploration areas，and the slope break zones are favorable exploration area for lithology.

Key words: fan delta, gentle slope shallow water, coastal sand dam, salt lake source rock, nose-bulge, structral trap, lithologic trap, Baikouquan Formation, Triassic, Shawan Sag, Junggar Basin

CLC Number: 

  • TE122
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