Characteristics of subsalt Jurassic faults and the influence on natural gas enrichment in the eastern part of the right bank of Amu Darya River

doi:10.3969/j.issn.1672-7703.2022.02.007

Abstract

Abstract: Natural gas resources are abundant in Amu Darya Basin in the Central Asia, and faults play an important role in subsalt Jurassic gas enrichment. By analyzing 3D seismic data, core samples and production performance in the eastern part of the right bank of Amu Darya River, the control effects of faults with different scales on the reservoir development and gas enrichment in the Callovian-Oxfordian carbonate reservoirs are systematically studied. The result shows that two groups of reverse faults in NE and NEE directions and four groups of strikeslip faults in NWW, EW, NNW and SN directions are developed in subsalt carbonate rocks, with structural types characterized by reverse faults related folds involved by basement and the compression-torsion related positive-flower structures. Faults were mainly formed in the Neogene,of which the NEE direction reverse faults were developed by the compression in the early Himalayan stage, and the NE direction reverse faults and strike-slip faults were formed in compression-torsion stress field in the middle-late Himalayan movement. Faults are distributed in zones in N-S direction bounded by A-Gao sinistral strike-slip fault belt. Among them, reverse faults are dominated by NE direction in the south side, while they gradually change to NEE direction in the north side. The SN trending strike-slip faults are mainly distributed to the east of Ma-Huo fault belt. Based on the scale, faults are divided into four categories, i.e., fault controlling structural belts, fault controlling traps, secondary fault in structures and micro fault. Faults of the first three categories mostly extend from basement to salt-gypsum rocks and control the development of fractured-vuggy reservoirs and the migration of natural gas. The higher the activity intensity of faults, the more developed the fracturedvuggy reservoir and the higher degree of gas enrichment. Three types of favorable zones are classified according to fault characteristics. Type Ⅰ is the large-scale fractured-vuggy gas reservoir development zone with strong gas-charging adjacent to fault controlling structural belts and fault controlling traps. Type Ⅱ is the fractured-vuggy gas reservoir development zone with partial weak gas-charging adjacent to the secondary faults in structures. Type Ⅲ is the fractured-porosity type or fractured gas reservoir development zone adjacent to micro faults. Among them, Type Ⅱ gas reservoir development zone is the key exploration target in the near further.

CLC Number:

TE111.2

Zhang Liangjie, Wang Hongjun, Cheng Muwei, Gong Xinglin, Xing Yuzhong, Jiang Lingzhi, Zhang Hongwei, Wu Defeng, Wang Lixin. Characteristics of subsalt Jurassic faults and the influence on natural gas enrichment in the eastern part of the right bank of Amu Darya River[J]. China Petroleum Exploration, 2022, 27(2): 71-83.

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