Geologic Manual for the Evaluation and Development of Coalbed Methane. TopicalReport, January 1992. 1.1.4 Coalbed Methane Multiple Coal Seam, Project 305

摘要

Analysis of geologic conditions is critical in the evaluation and development ofa coalbed methane prospect. In the exploration phase, the first objective is to evaluate available geologic data with emphasis on coal thickness, gas content, gas composition, distribution and depth of coalbed, permeability, reservoir pressure, and local structure. The second objective, if warranted, is to collect new data with a corehole and logging program and/or by monitoring and testing production wells during the development phase. Also, analysis of the geology and hydrology of an area can play a major role in the development of a prospect by identifying permeable zones. These permeable zones can be inferred by field studies, photogeology, and hydrologic testing. Optimum production can be achieved by selecting well locations where the greatest permeabilities occur and by using the geologic characterization of an area in determining optimum completion and production techniques. Experience and insight from conducting research and producing gas at GRI's Rock Creek site in Alabama provided some of the knowledge base included in the topical report.