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| Study on coalbed methane reservoir strata characteristics of X block in Santang syncline of Guizhou Zhina coalfield |
| Zhao Hengyi1,2, Zou Jianghai1,2, Yang Yongyu1,2 |
| 1. Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Structural Area, Ministry of Natural Resources, Guiyang 550081， China; 2. Guizhou Institute of Petroleum Exploration and Development Engineering, Guiyang 550081， China |
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Abstract In order to find out the reservoir strata characteristics of coalbed methane in Santang syncline of Zhina coalfield in Guizhou, the comprehensive analysis of indoor experiment and logging curve analysis was carried out by outcrop, logging, well test and other data. The research showed that the main coal bearing strata in Santang syncline was Longtan Formation, the number of coal strata was many and thin, the coal body structure was mainly cataclastic coal and primary structural coal, the gas content of the main coal seam was 8.98 ~ 18.05 m3/t, the porosity was 1.47% ~ 7.67 %, the permeability was 0.027 1 ~ 0.21 mD, the joint fracture connectivity was good, and the micro-fracture was developed and partially filled. The result obtained in this study provided a reference for the selection of fracturing geological strata in the subsequent large-scale development of coalbed methane in Santang syncline, which had certain guiding significance.
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