Xinjiang Petroleum Geology ›› 2020, Vol. 41 ›› Issue (5): 542-549.doi: 10.7657/XJPG20200505

• OIL AND GAS EXPLORATION • Previous Articles     Next Articles

Distribution and Genesis of Abnormal Bodies in Maokouzu Sag in Kaijiang Area, Northeastern Sichuan Basin

YANG Liu1(), ZANG Dianguang1, XU Baoliang1, DENG Shaoqiang1, CHEN Hongfan1, YANG Rongrong1, CHEN Wei2   

  1. 1. Southwest Geophysical Research Institute, BGP, CNPC, Chengdu, Sichuan 610213, China
    2. Exploration Division, Southwest Oil and Gas Field Company, PetroChina, Chengdu, Sichuan 610041, China
  • Received:2020-03-24 Revised:2020-07-10 Online:2020-10-01 Published:2020-10-10

Abstract:

Based on 3D seismic data and high-precision seismic curvature, the distribution and genesis of the abnormal bodies on seismic sections are analyzed in the Maokouzu sag in the Kaijiang area, northeastern Sichuan basin. It is found that the abnormal bodies are widely distributed in the Kaijiang area and mainly located near the NWW-SEE strike-slip faults developed during the Emei taphrogenesis. The strike-slip faults provide good channels for the migration of hydrothermal fluid which erodes the limestone of the Maokou formation, and consequently creates good reservoirs. Joint analysis of seismic and geological data found that it was hydrothermal dissolution that caused the formation of abnormal bodies in the Maokouzu sag. It is of great significance to make clear the distribution and genesis of the abnormal bodies in expanding the exploration field and increasing the reserves and production in the northeastern Sichuan basin.

Key words: northeastern Sichuan basin, Maokou formation, abnormal body, distribution, genesis, strike-slip fault, hydrothermal dissolution

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