Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (4): 1011-1020.doi: 10.13278/j.cnki.jjuese.201504105

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Lower Physical Property Limit and Controlling Factors on Deep Effective Clastic Reservoirs in Kelasu Structure Zone

Pan Rong1,2, Zhu Xiaomin1,2, Zhang Jianfeng2, He Min3, Di Hongli4   

  1. 1. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China;
    2. College of Geosciences, China University of Petroleum, Beijing 102249, China;
    3. Chongqing Gas District, PetroChina Southwest Oil and Gas Company, Chongqing 400021, China;
    4. PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China
  • Received:2014-11-14 Published:2015-07-26

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Abstract:

The Cretaceous Bashijiqike Formation is a high-quality sandstone reservoir and a primary oil/gas-producing bed in Kelasu structure zone. As its burial depth is between 2 300 m to 7 900 m, and cores are relatively limited, and the prediction of effective reservoirs is considerably difficult. Based on the comprehensive application of the core, well logging data, mercury injection data, and oil production test, the lower physical property limit of deep clastic reservoirs in Kelasu structure zone is determined by the distribution function curve method, the upper limit of water saturation method, the lowest effective pore throat radius method, and the entry pressure method. The functional equation between lower physical property limit and depth is obtained. The lower porosity limit of effective reservoirs is 2.63%. The lower burial depth limit of effective reservoirs is predicted to be about 8 320 m, which indicates a bright exploration prospect. The lower porosity limit and the lower burial depth limit would be 1.69% and 9 860 m in theory. On the basis of the research of lower physical property limit, combining the analysis of the sedimentary characteristics, buried depth, reservoir pressure, and diagenesis characteristics of Bashijiqike Formation sandbodies, the controlling factors of effective reservoirs are discussed. The main controlling factors of the effective reservoir include buried depth, dissolution and fissure.

Key words: Kelasu structure area, effective reservoir, lower physical property limit, controlling factors, Bashijiqike Formation, Kuqa depression

CLC Number: 

  • TE122.23

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