Productivity Evaluation of Coalbed Methane Well with Geophysical Logging-Derived Tectonically Deformed Coal

Qiang Chen, Jin Jing, Jun Liu, Jianhui Long and Sheng Zhang
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Qiang Chen: Department of Earth Science & Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Jin Jing: Department of Earth Science & Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Jun Liu: Shanxi Coal Geological Prospecting Institute of Hydrology, Taiyuan 030006, China
Jianhui Long: Department of Earth Science & Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Sheng Zhang: Department of Earth Science & Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Energies, 2019, vol. 12, issue 18, 1-15

Abstract: Tectonically deformed coal (TDC) has a significant influence on coalbed methane recovery. Well-logging is a reliable and efficient way to predict the development of TDCs for understanding the role of TDC on the productivity of coalbed methane (CBM) wells. However, there has been insufficient research regarding both the static physical properties and dynamic invasion of mud-filtrate related to TDCs. Therefore, a new TDC-detecting approach using two indicators of the relative physical properties and fluid attributes was proposed. Through the data normalization and optimization of correlation coefficients and factor analysis, five logs were chosen to construct the two indicators, and three types of TDC were recognized: I—undeformed or cataclastic; II—granulated; and III—mylonitized. It was found out that the identification error rate decreased from 30% to 15%. Furthermore, the thickness ratio of a well-preserved coal layer derived from TDC interpretation was adopted to correlate the gas production of a coal seam. An application in the Hancheng block demonstrated that the thickness ratio of 60% is an explicit threshold value to distinguish between high-yield well (>1000 m 3 /d) and low-yield one (<750 m 3 /d). The development of granulated and mylonitized coals mainly exerts negative influence on CBM well production.

Keywords: tectonically deformed coal; CBM; productivity evaluation; geophysical logging (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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