Journal of Southwest Petroleum University(Science & Technology Edition) ›› 2023, Vol. 45 ›› Issue (5): 1-13.DOI: 10.11885/j.issn.1674-5086.2021.04.21.01

• GEOLOGY EXPLORATION •     Next Articles

Reservoir Characteristics and Formation Mechanism of Sangonghe Formation in the Sag West of Well Pen-1

MA Cong1,2,3, ZHOU Junjun4, HU Liang1,2,3, QI Jing1,2,3, WU Haiguang4   

  1. 1. Key Laboratory of Conglomerate Reservoir Exploration and Development, CNPC, Karamay, Xinjiang 834000, China;
    2. Key Laboratory of Conglomerate Reservoir in Xinjiang, Karamay, Xinjiang 834000, China;
    3. Experiment and Testing Institute, Xinjiang Oilfield Company, CNPC, Karamay, Xinjiang 834000, China;
    4. School of Geosciences, Northeast Petroleum University, Daqing, Heilongjiang 163318, China
  • Received:2021-04-21 Published:2023-10-28

Abstract: In this study, the sedimentary characteristics and the formation mechanism of the high-quality reservoir of the sandy debris flow sandbody were investigated. The systematic core, ordinary section and cast section observation, scanning electron microscopy (SEM) and electron probe analysis, and carbon and oxygen isotope measurement were carried out. The results show that the J1s2 sandy debris flow in the sag west of Well Pen-1 contains six different lithologies: Massive fine conglomerate with mud-gravel, massive coarse sandstone with gravel, massive coarse sandstone, massive medium-fine sandstone, stratified fine sandstone and mudstone (or argillaceous siltstone). The physical properties of massive coarse sandstone with gravel, massive coarse sandstone, and massive medium-fine sandstone are the best because they contain a large number of residual intergranular pores and dissolution pores. The “clay mineral coating” composed of single chlorite and the “composite mineral coating” composed of both chlorite and siderite are generally developed in the high-quality reservoirs, which effectively inhibits the secondary increase of quartz and preserves the primary pores in the deep burial process. The dissolution of organic acids and other fluids in the late period also has some positive significance for the improvement of reservoir quality.

Key words: Sangonghe Formation, deep high particle content density flow, sedimentary characteristics, formation mechanism, Junggar Basin

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