Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (3): 104-116.doi: 10.12108/yxyqc.20220310

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Discrete fracture characterization and modeling of Paleogene in Dina-2 gas field， Tarim Basin

CHEN Yuan1, LIAO Faming1, LYU Bo1, JIA Wei1, SONG Qiuqiang1, WU Yan1, KANG Ju1, XIAN Rangzhi2   

  1. 1. Dina Oil and Gas Development Department, PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China;
    2. Supervision Center, PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China
  • Received:2021-06-28 Revised:2021-09-22 Online:2022-05-01 Published:2022-05-12

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Abstract: Based on the data of core analysis，imaging logging， geophysics，reservoir geology and reservoir performance，the basic parameters of fractures of Paleogene in Dina-2 gas field of Tarim Basin were described. The joint technologies such as structural smoothing，three-dimensional boundary detecting and boundary strengthening were used to identify the multi-scale fracture distribution，and then a three-dimensional geological model of fracture distribution was established by using multi-scale fracture modeling technology. The results show that： （1）The Paleogene fractures in Dina area are mainly high angle oblique fractures and vertical fractures in near EW direction. The true opening of macro fractures is generally less than 0.460 mm，the average linear density is 0.730 pieces per meter，the filling degree is high. The true opening of micro fractures is less than 0.037 mm， the average surface density is 0.031 pieces per square meter，and the filling degree is low. Most of the fractures are shear fractures related to structural deformation and faulting.（2）The three-dimensional minimum curvature seismic attribute is sensitive to faults and fractures. The ant-tracking attribute volumes identified by boundary detecting and three-dimensional boundary strengthening technology has significantly improved the recognition degree of faults and fractures. The sedimentary reservoir and production performance characteristics can be used to predict the distribution of small-scale fractures between wells.（3）The sequential Gaussian random simulation under facies-controlled conditions was adopted for reservoir simulation. The porosity and permeability before and after simulation are basically consistent. The error between the calculated geological reserves and real reserves is small. On the whole，the geological model can objectively reflect the underground geological characteristics of gas reservoir.（4）The weights were analyzed with different attribute volumes of the four groups of fractures in the study area. The attribute volumes were fused with different weight coefficients to establish the fracture density attribute field. By optimizing the fracture modeling method，the corresponding model parameters were set for different fracture groups to complete the three-dimensional geological model of discrete fractures. Through dynamic verification，the overall error of formation coefficient is less than 5%.

Key words: dynamic optimization, fracture modeling, geological modeling, fracture characterization, Paleogene, Dina-2 gas field, Tarim Basin

CLC Number: 

  • TE122.1
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