Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (6): 138-145.doi: 10.12108/yxyqc.20200613

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Gas-bearing property evaluation of tight sandstone reservoir based on Xu-White model

ZHANG Peng1,2, YANG Qiaoyun3, FAN Yiren3, ZHANG Yun1,2, ZHANG Haitao4   

  1. 1. No.1 Gas Production Plant, PetroChina Changqing Oilfield Company, Xi'an 710021, China;
    2. Project Group for Evaluation and Excavation of Qiankou Gas Well, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    3. School of Geosciences, China University of Petroleum(East China), Qingdao 266580, Shandong, China;
    4. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China
  • Received:2020-03-20 Revised:2020-05-10 Online:2020-12-01 Published:2020-10-30

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Abstract: The tight sandstone reservoir in eastern Ordos Basin is a typical lithologic gas reservoir,with poor physical properties,limited reservoir space and complex pore structure. The conventional logging data is easily influenced by rock matrix, pore fluid makes little contribution to its response characteristics, and well logging curve is difficult to highlight the information of pore fluid effectively,which leads to gas identification difficultly. In order to solve this problem effectively,a new method for identifying gas-bearing tight sandstone gas reservoir was proposed by obtaining gas-bearing indicator factor and gas-bearing sensitive parameters such as P-S-wave velocity ratio difference,bulk modulus difference,which is based on Xu-White model,array acoustic logging data,BiotGassmann equation and fluid replacement model. The results show that array acoustic logging can get real acoustic information reflecting the real framework and fluid characteristics of the formation,so it is an effective method for gas-bearing property evaluation of tight sandstone reservoirs. The accuracy of identification of tight sandstone gas reservoir by bulk modulus difference and gas-bearing indicator factor is high,and the gas-bearing property evaluation effect is good,while the evaluation effect of P-S velocity ratio difference is poor. According to actual data processing and gas test data,this method achieved good results in gas-bearing property evaluation of tight sandstone reservoir in eastern Ordos Basin,meanwhile it can provide some technical support for gas-bearing property evaluation of similar tight sandstone reservoirs in other areas.

Key words: Xu-White model, Biot-Gassmann equation, array acoustic logging, tight sandstone reservoirs, gas reservoir identification

CLC Number: 

  • P631.81
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