Lithologic Reservoirs ›› 2011, Vol. 23 ›› Issue (5): 69-72.doi: 10.3969/j.issn.1673-8926.2011.05.014

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Fracture prediction of Daanzhai member in Langzhong-Nanbu area, northern Sichuan

WANG Shilin1，QIN Qirong1，SU Peidong1，FAN Xiaoli2，LI Le3   

  1. 1. College of Resources and Environment， Southwest Petroleum University， Chengdu 610500， China； 2. Research Institute of Petroleum Exploration and Development， Zhongyuan Oilfield Company， Sinopec， Puyang 457001， China； 3. Geophysical Exploration Company， Chuanqing Drilling Corporation， PetroChina， Chengdu 610500， China
  • Online:2011-10-20 Published:2011-10-20

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Abstract:

The geological condition in Langzhong-Nanbu area in northern Sichuan is complex. The reservoir of Daanzhai member is thin and super tight with its pores, holes and fractures as main storage and permeation spaces. The development of the fractures is the main factors for controlling the reservoir productivity. The great differences in reservoir productivity among the adjacent wells in the same set of reservoir reflect that the reservoir heterogeneity is strong and it is mainly controlled by the development of fractures. Based on core, logging and oil testing, the method of rock fracturing approximation degree, curvature method and seismic trace discontinuity detection method are used to predict the fractures, and the accuracy of fracture prediction which is depended on the 2D seismic data is well enhanced. The quantitative study by using the weight value to judge the fracture development is carried out, which provides basis for seeking the favorable reservoir and deploying drilling site.

Key words: three-parameter AVO, waveforminversion, modified Cauchy distribution, high resolution

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