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Application of Cross-Plotting Techniques for Delineation of Coal and Non-Coal Litho-Units from Well Logs

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Author(s): Rima Chatterjee | Suman Paul

Journal: Geomaterials
ISSN 2161-7538

Volume: 02;
Issue: 04;
Start page: 94;
Date: 2012;
Original page

Keywords: Jharia Coalfield | Cross-Plot | P-Wave Impedance | CBM Reservoir

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.
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