1887

Abstract

Summary

A workflow for recovering fracture network characteristics from seismic data is considered. First, the presented discrete fracture modeling technique properly describes fracture models on the seismic scale. The key procedure of the workflow is 3D diffraction imaging based on the spectral decomposition of different combination s of selective images. Selective images are obtained by the prestack asymmetric migration procedure, while spectral decomposition occurs in the Fourier domain with respect to the spatial dip and the azimuth angles. At the final stage, we propose a topological analysis based on the construction of a merge tree from the obtained diffraction images. The results of the topological algorithm are modeling parameters for the discrete fractures. To analyze the effectiveness of the proposed workflow, a statistical comparison of the recovered parameters and true model parameters are provided. We use the Kolmogorov -Smirnov test for a statistical analysis of the fracture lengths, while the behavior of the Morisita index shows the statistical distribution of the modeled fracture corridors. Numerical examples with synthetic realistic models demonstrate a detailed, reliable reconstruction of the statistical characteristics of the fracture corridors.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201902217
2019-09-02
2020-07-06
Loading full text...

Full text loading...

References

  1. Ayers Jr, W. B., & Kaiser, W. A.
    (Eds.) (1994). Coalbed methane in the Upper Cretaceous Fruitland Formation San Juan Basin, Colorado and New Mexico. Report of Investigations, 218 (216 p.). Austin Tx: Texas Bureau of Economic Geology.
    [Google Scholar]
  2. Ayers, W. B.
    (2002). Coalbed gas systems, resources, and production and a review of contrasting cases from the San Juan and Powder River Basins. AAPG Bulletin, 86 (11), 1853–1890.
    [Google Scholar]
  3. Ayers, W. B., & Ambrose, W. A.
    (1990). Geologic controls on the occurrence of coalbed methane in Fruitland Formation in San Juan Basin. In J. B.AyresJr. et al. (Eds.) Geologic evaluation of critical production parameters for coalbed methane resources: Part 1 (pp. 9–72). Tuscon Az: Gas Research Institute, Annual Report GRI-9010014.1.
    [Google Scholar]
  4. Ayers Jr, W. B., Ambrose, W. A., & Yeh, J.
    (1991). Depositional and structural controls on coalbed methane occurrence and resources in the Fruitland Formation, San Juan basin. In Geologic and hydrologic controls on the occurrence and producibility of coalbed methane, Fruitland Formation, San Juan Basin (pp. 9–46). Chicago Ill: Gas Research Institute Topical Report GRI-91/0072.
    [Google Scholar]
  5. Combes, J. M.
    (1997). The Southern Boundary of the San Juan Basin Coalbed Methane High-Production Fairway, New Mexico, USA Proc. In 1997 International Coalbed Methane Symposium, Tuscaloosa, Alabama, May1997 (pp. 567–575).
    [Google Scholar]
  6. Kaiser, A., & Ayres, W. B.Jr.
    (1994). Geologic and hydrologic characterization of coalbed-methane reservoirs in the San Juan Basin. SPE Formation Evaluation, 9 (3), 175–184.
    [Google Scholar]
  7. Li, G.
    (2009). Theoretical research and practice on coal mine methane extraction and ground development design. Procedia Earth and Planetary Science, 1 (1), 94–99.
    [Google Scholar]
  8. Ma, X., Song, Y., Liu, S., Jiang, L., & Hong, F.
    (2013). Origin and evolution of waters in the Hancheng coal seams, the Ordos Basin, as revealed from water chemistry and isotope (H, O, 129I) analyses. Science China Earth Sciences, 56 (11), 1962–1970.
    [Google Scholar]
  9. Pashin, J. C.
    (1991). Regional analysis of the Black Creek-Cobb coalbed-methane target interval, Black Warrior basin, Alabama (No. 145, 127 p.). Tuscaloosa Alabama: Geological Survey of Alabama.
    [Google Scholar]
  10. Qin, Y.
    (2005). Advances in overseas geological research on coalbed gas: Origin and reservoir characteristics of coalbed gas. Earth Science Frontiers, 12 (3), 289–298.
    [Google Scholar]
  11. Song, Y., Qin, S.H., & Zhao, M.
    (2007). Two key geological factors controlling the coalbed methane reservoirs in China. Natural Gas Geoscience, 18 (4), 545–552.
    [Google Scholar]
  12. Yang, Q., & Tang, D.
    (2000). Effect of coal metamorphism on methane content and permeability of coal in north China. Earth Science-Journal of China University of Geoscience, 25 (3), 273–278.
    [Google Scholar]
  13. Yao, Y., Liu, D., Tang, D., Tang, S., Che, Y., & Huang, W.
    (2009). Preliminary evaluation of the coalbed methane production potential and its geological controls in the Weibei Coalfield, Southeastern Ordos Basin, China. International Journal of Coal Geology, 78 (1), 1–15.
    [Google Scholar]
  14. Yao, Y., Liu, D., & Qiu, Y.
    (2013). Variable gas content, saturation, and accumulation characteristics of Weibei coalbed methane pilot-production field in the southeastern Ordos Basin, China. AAPG Bulletin, 97 (8), 1371–1393.
    [Google Scholar]
  15. Zhang, X.
    (2002). Coalbed methane resource assessment in China.Beijing, China: Science Press.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201902217
Loading
/content/papers/10.3997/2214-4609.201902217
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error