Field scale coal permeability modeling and sweet-spotting using seismic attributes
Krishanu Bandyopadhyay1
Jyotirmoy Mallik2
Sushree Suman2
Rajib Dhar3
Nasif Ahmed Shaik4
Nimisha Vedanti4
1.Indian Institute of Science Education and Research Bhopal,Bhopal,Madhya Pradesh 462066,India;BP,Pune,Maharashtra 411014,India2.Indian Institute of Science Education and Research Bhopal,Bhopal,Madhya Pradesh 462066,India3.Essar Oil and Gas Exploration and Production Limited,Durgapur,West Bengal 713212,India4.CSIR-National Geophysical Research Institute(NGRI),Hyderabad,Telangana 500007,India;Academy of Scientific and Innovative Research(AcSIR),Ghaziabad 201002,India
摘要：Pre-drill estimation of coal bed permeability is a major challenge for Coal-bed Methane(CBM)extraction and CO2 sequestration in coal beds.Unlike conventional reservoirs,the permeability of coal is solely dependent on fractures,as matrix permeability is negligible.The distribution of primary(face and butt cleats)and secondary fractures(tectonic fractures)imparts significant heterogeneity in coal beds.This remains a challenge for CBM Operators to quantify and map permeability sweet-spots.In this paper,an innovative solution to these is proposed by building permeability models within a sector of the Raniganj coal field,India.Initially,structural realizations are constructed by interpreting thirteen 2D seismic lines over the study area.Thereafter,permeability distribution in these structural models is populated by permeability-depth trends.Separate trends of primary and secondary fractures are derived from literature,field observa-tions,and discrete fracture network(DFN)models of coal samples.The curvature attribute of the interpreted coal beds from seismic reflection surfaces is used as a substitute for the intensity of tectonically controlled fractures.Finally,a workflow of integrating tectonically controlled fracture permeability with cleat-controlled permeability is demonstrated to locate possible permeability sweet-spots.Although the workflow is demonstrated in the Raniganj coalfield,it can be used globally for pre-drill permeability estimation and well-planning during appraisal/development.
机标关键词：permeabilitymodelingscalefieldattributescoalseismicsweet-spotting
论文发表日期：2025-12-31
在线出版日期：2026-01-30（本平台首次上网日期，不代表文献的发表时间）
页数：26( 149-174 )
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