GM  Vol.2 No.4 , October 2012
Application of Cross-Plotting Techniques for Delineation of Coal and Non-Coal Litho-Units from Well Logs
Abstract: Well log responses can be used to delineate coal and carbonaceous shale from other non-potential litho-units by cross-plotting technique. The cross-plotting between gamma ray and density had been carried out for 15 wells of Jharia coalfield, India. Through these different cross-plots across the study area, different litho-units like; coal, shaly coal, carbonaceous shale, shale, sand/sandstone, shaly sand, jhama and igneous intrusion (mica peridotite) have been identified. Clustering of points for different lithologies in the above cross-plots indicate that the different trends with marginal overlap between carbonaceous shale/shaly coal and shale as well as shaly sand and shale. The coal horizons are mostly overlain and underlain by shale or sandstone. Cross-plot analysis indicates the various coal lithologies which will play important role in CBM exploration and exploitation strategy.
Cite this paper: R. Chatterjee and S. Paul, "Application of Cross-Plotting Techniques for Delineation of Coal and Non-Coal Litho-Units from Well Logs," Geomaterials, Vol. 2 No. 4, 2012, pp. 94-104. doi: 10.4236/gm.2012.24014.

[1]   W. B. Ayers Jr., “Coalbed Gas Systems, Resources, and Production and a Review of Contrasting Cases from the San Juan and Powder River Basins,” AAPG Bulletin, Vol. 86, No. 11, 2002, pp. 1853-1890.

[2]   S. Bachu and K. Michael, “Possible Controls of Hydroge- ological and Stress Regimes on the Producibility of Coalbed Methane in Upper Cretaceous—Tertiary Strata of the Alberta Basin, Canada,” AAPG Bulletin, Vol. 87, No. 11, 2003, pp. 1729-1754. doi:10.1306/06030302015

[3]   J. S. Bell and S. Bachu, “In Situ Stress Magnitude and Orientation Estimates for Cretaceous Coal-Bearing Strata Beneath the Plains Area of Central and Southern Alberta,” Bulletin of Canadian Petroleum Geology, Vol. 51, No. 1, 2003, pp. 1-28. doi:10.2113/gscpgbull.51.1.1

[4]   T. Gentzis, “Review of Mannville Coal Geomechanical Properties: Application to Coalbed Methane Drilling in the Central Alberta Plains, Canada,” Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, Vol. 32, No. 4, 2009, pp. 355-369. doi:10.1080/15567030802466110

[5]   H. E. Ross and M. D. Zoback, “Sub-Hydrostatic Pore Pressure in Coalbed and Sand Aquifers of the Powder River Basin, Wyoming and Montana, and Implications for Dis- posal of Coalbed-Methane-Produced Water through Injection,” Rocky Mountain Geology, Vol. 43, No. 2, 2008, pp. 155-169. doi:10.2113/gsrocky.43.2.155

[6]   S. Hunze and T. Wonik, “Lithological and Structural Characteristics of the Lake Bosumtwi Impact Crater, Ghana: Interpretation of Acoustic Televierwe Images,” Meteoritics & Planetary Science, Vol. 42, No. 4-5, 2007, pp. 779- 792. doi:10.1111/j.1945-5100.2007.tb01074.x

[7]   M. G. Lamont, T. A. Thompson and C. Bevilacqua, “Drilling Success as a Result of Probabilistic Lithology and Fluid Prediction: A Case Study in the Carnarvon Basin, WA,” APPEA, 2008, pp. 1-12.

[8]   P. F. Anderson and F. D. Gray, “Using LMR for Dual Attribute Lithology Identification,” Expanded Abstracts, SEG, San Antonio, 2001.

[9]   F. D. Gray and E. C. Andersen, “Case Histories: Inversion for Rock Properties,” EAGE 62nd Conference and Technical Exposition, 2000.

[10]   X. G. Chi and D. H. Han, “Lithology and Fluid Differentiation Using a Rock Physics Template,” The Leading Edge, Vol. 28, No. 1, 2009, pp. 60-65. doi:10.1190/1.3064147

[11]   L. M. Gochioco, “Recent role of Geophysics in US Coal and CBM Development,” The Leading Edge, Vol. 21, No. 5, 2002, pp. 452-455. doi:10.1190/1.1885502

[12]   D. Chandra, “Jharia Coalfield,” Mineral Resources of India, Geological Society of India, Bangalore, 1992.

[13]   Y. Yang, T. A. Cloud and C. W. Van Kirk, “New Applications of Well Log Parameters in Coalbed Methane (CBM) Reservoir Evaluation at the Drunkards Wash Unit, Uinta Basin, Utah,” SPE Eastern Regional Meeting, Morgantown, 14-16 September 2005, Paper ID: SPE 97988.