Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (2): 110-119.doi: 10.12108/yxyqc.20180212

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Accumulation conditions and seismic identification techniques of shallow gas in the Bay of Bengal

ZUO Guoping, FAN Guozhang, LYU Fuliang, SHAO Dali   

  1. PetroChina Hangzhou Research Institute of Geology, Hangzhou 310023, China
  • Received:2017-07-04 Revised:2017-09-18 Online:2018-03-21 Published:2018-03-21

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Abstract: In order to identify and predict the distribution of shallow gas effectively in the Bay of Bengal, this paper demonstrated the genesis, features, and accumulations conditions of shallow gas, such as the type of shallow gas, source rocks, reservoirs and seals. According to the 3D seismic data interpretation and analysis of seismic characteristics of shallow gas, three typical characteristics of shallow gas were drawn:(1)Bright spot characteristics. It has "double track" seismic reflection and middle-high amplitude characteristics. (2)Phase reversal characteristics. It represents obvious polarity reversal phenomenon in the shallow gas boundary. (3)Low frequency. It has low frequency phenomenon in the shallow gas interval. A set of technical methods was formed to identify shallow gas, including bright spot technology, amplitude comparison method, phase attribute, frequency attribute, pre-stack AVO, etc. It provides a technical support to identify the shallow gas quickly and efficiently, and plays an important role in the shallow gas prediction and offshore geologic hazard prevention, and achieves good results in the Bay of Bengal.

Key words: shallow gas, structural-lithologic reservoirs, deep-water sediments, seismic response characteristics, the Bay of Bengal

CLC Number: 

  • P631.4
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