Coalbed Methane Reservoir Evaluation from Wireline Logs in TS District, Southern Qinshui Basin

Abstract

Abstract:

Coalbed methane (CBM) is an unconventional natural gas which is generated and stored in coalbeds.Unlike conventional natural gas, the parameters of proximate analysis components, matrix porosity, fractural permeability and gas content and so on, should be paid more attention in the evaluation of coalbed methane reservoir. In this paper, geophysical logging data are used to evaluate the parameters of coalbed methane reservoir in the TS District of Southern Qinshui Basin. First the responses were analyzed from the geophysical logging data, and then the proximate analysis components of coal were calculated by regression analytical method and its application condition was studied.Considering the variety and complexity of the factors of CBM content, the Langmuir rank equation method, which is based on the isotherm adsorption equation, was introduced to estimate the CBM gas content through combining the analysis results of the correlation region coal samples.By analyzing the dual porosity characters of coalbeds, the total porosity can be calculated by density porosity formula of variable matrix density, while using the dual lateral logging data, the fracture porosity can be calculated by iteration approximation method.At last, according to the well developed face cleat but the little developed butt cleat in the coalbeds, the fractural permeability of CBM reservoir can be calculated by a simplified single group plate crack model. The calculation result of well TSA show that the proximate analysis components and CBM gas content are with high precision, meanwhile, the total porosity is about 55%, the fracture porosity is mostly less than 05%, and the fracture permeability is about 0.001×10-3 μm2 to 10×10-3 μm2.These poroperm characteristics matched well with the data of adjacent area.These means the certain parameters of CBM reservoir can be estimated accurately by geophysical logging data.

Key words: coalbed methane (CBM), geophysical logging data, proximate analysis components, Langmuir rank equation, fractural permeability, gas content

HUANG Zhao-Hui, JU Chang-Chun, YANG Yu-Qing, ZHANG Guo-Hua, WANG Wen-Wen. Coalbed Methane Reservoir Evaluation from Wireline Logs in TS District, Southern Qinshui Basin[J]. Geoscience, 2012, 26(6): 1275-1282.

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