Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (1): 120-127.doi: 10.12108/yxyqc.20200113

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Analysis and countermeasures of seismic prediction traps for Xu-2 gas reservoir in central Sichuan Basin: a case study from Longnyusi block

LI Xinyu1, ZHANG Jing1,2, BAO Shihai1, ZHANG Lianqun1, ZHU Qiliang3, YAN Haijun1, CHEN Sheng1   

  1. 1. PetroChina Research Institute of Petroleum Exploration&Development, Beijing 100083, China;
    2. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China;
    3. Downhole Operation Company, Bohai Drilling Engineering Co., Ltd, CNPC, Renqiu 062552, Hebei, China
  • Received:2019-04-09 Revised:2019-07-01 Online:2020-01-21 Published:2019-11-22

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Abstract: The second member of Xujiahe Formation of Upper Triassic in central Sichuan Basin is rich in natural gas resources and has great potential for exploration and development. However,in recent years,there are neither significant exploration discoveries nor good economic benefits. The reason is the unclear understanding of the distribution of the enriched area of Xu-2 reservoir. Based on study,three kinds of fatal prediction traps in the seismic prediction of the Xujiahe gas reservoir enrichment area were summarized:(1) Insufficient understanding of the vertical distribution of the effective reservoir and its corresponding seismic reflection characteristics; (2) the mudstone interlayer in upper Xu-2 were well developed,the reflection characteristics of mudstone interlayer and effective reservoir are similar;(3) the difference of seismic reflection characteristics between gas layer,water layer and dry layer is small. According to the three kinds of prediction traps in the prediction process,some targeted technical countermeasures were formed,such as forward modeling to identify reservoir characteristics,frequency division inversion to identify mudstone,prestack AVO technology to distinguish gas layer,water layer and dry layer,which were applied in the prediction of Xu-2 gas reservoir in Longnyusi block,central of Sichuan Basin,and the new drilling forecast compliance rate was more than 90%. These techniques improve the prediction accuracy of Xu-2 gas reservoir and effectively support the exploration and development of the Xu-2 gas reservoir.

Key words: seismic reflection characteristic, prediction trap, forward modeling, frequency division inversion, prestack AVO technology, the second member of Xujiahe Formation, Sichuan Basin

CLC Number: 

  • P631.4
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