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

• 作者: Rima Chatterjee Suman Paul
• 来源期刊: 地质材料(英文)
• 学科: 医学
• 关键词: Jharia Coalfield Cross-Plot P-WAVE Impedance CBM Reservoir
• 年，卷（期）: 2012,（4）
• 页码范围: 94-104
• 页数: 11页
• 分类号: R73

摘要

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.