Oil & Gas Geology ›› 2020, Vol. 41 ›› Issue (3): 627-637.doi: 10.11743/ogg20200318

• Methods and Technologies • Previous Articles     Next Articles

An approach to 3D geological modeling of multi-scaled fractures in tight sandstone reservoirs

Dong Shaoqun1,2, Lyu Wenya1,3, Xia Dongling4, Wang Shijia5, Du Xiangyi1,3, Wang Tao6, Wu Yue4, Guan Cong1,3   

  1. 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
    2. College of Science, China University of Petroleum(Beijing), Beijing 102249, China;
    3. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China;
    4. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China;
    5. No.2 Gas Production Plant, Qinghai Oil Field Branch Company Ltd., PetroChina, Dunhuang, Gansu 736202, China;
    6. Chinese Academy of Geological Sciences, Beijing 100037, China
  • Received:2019-07-20 Revised:2020-03-05 Published:2020-06-16

RichHTML

31

PDF (PC)

301

Abstract: The fracture system in a tight sandstone reservoir is composed of multi-scaled fractures,Fractures of each scale play a different role in oil and gas recovery.Multi-scaled fracture modeling is crucial for the development of tight reservoirs.However,there are still problems in multi-scaled fracture modeling in terms of multi-scaled fractures' coupling,determination of simulation termination conditions,and efficiency improvement of constrained modeling algorithm.To solve these problems,we discuss the three-dimensional (3D) geological modeling of multi-scaled fractures in tight sandstone reservoirs in H oilfield,Ordos Basin,based on common fracture network modeling,with a view to improving the efficiency and accuracy of multi-scaled fracture modeling.The proposed multi-scaled fracture modeling method in the study includes 4 steps,namely identification of large-scaled fractures with a deterministic method,multi-scaled coupling through distribution function matching for determining the parameters required for small-scaled fracture modeling,generation of medium- and small-scaled fracture networks by an improved method of discrete fracture network modeling constrained by fracture density,and superimposition of multi-scaled fracture networks.To verify the efficiency of the proposed method,we compare the built fracture model with single-well fracture interpretation,production data,etc.in the study area,and the results indicate that the multi-scaled fracture model established by the proposed method coincides with actual geological understanding.

Key words: multi-scaled information coupling, discrete fracture network modeling, multi-scaled fracture, tight sandstone reservoir, Ordos Basin

CLC Number: