Productivity Evaluation of Coalbed Methane Well with Geophysical Logging-Derived Tectonically Deformed Coal
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 researc...
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MDPI AG
2019-09-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/12/18/3459 |
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| author | Qiang Chen Jin Jing Jun Liu Jianhui Long Sheng Zhang |
| author_facet | Qiang Chen Jin Jing Jun Liu Jianhui Long Sheng Zhang |
| author_sort | Qiang Chen |
| collection | DOAJ |
| description | 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<sup>3</sup>/d) and low-yield one (<750 m<sup>3</sup>/d). The development of granulated and mylonitized coals mainly exerts negative influence on CBM well production. |
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| format | Article |
| id | doaj.art-ebcdeb345b8741278c2db55f3796ca26 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-14T02:17:07Z |
| publishDate | 2019-09-01 |
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| series | Energies |
| spelling | doaj.art-ebcdeb345b8741278c2db55f3796ca262022-12-22T02:18:09ZengMDPI AGEnergies1996-10732019-09-011218345910.3390/en12183459en12183459Productivity Evaluation of Coalbed Methane Well with Geophysical Logging-Derived Tectonically Deformed CoalQiang Chen0Jin Jing1Jun Liu2Jianhui Long3Sheng Zhang4Department of Earth Science & Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaDepartment of Earth Science & Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaShanxi Coal Geological Prospecting Institute of Hydrology, Taiyuan 030006, ChinaDepartment of Earth Science & Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaDepartment of Earth Science & Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaTectonically 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<sup>3</sup>/d) and low-yield one (<750 m<sup>3</sup>/d). The development of granulated and mylonitized coals mainly exerts negative influence on CBM well production.https://www.mdpi.com/1996-1073/12/18/3459tectonically deformed coalCBMproductivity evaluationgeophysical logging |
| spellingShingle | Qiang Chen Jin Jing Jun Liu Jianhui Long Sheng Zhang Productivity Evaluation of Coalbed Methane Well with Geophysical Logging-Derived Tectonically Deformed Coal Energies tectonically deformed coal CBM productivity evaluation geophysical logging |
| title | Productivity Evaluation of Coalbed Methane Well with Geophysical Logging-Derived Tectonically Deformed Coal |
| title_full | Productivity Evaluation of Coalbed Methane Well with Geophysical Logging-Derived Tectonically Deformed Coal |
| title_fullStr | Productivity Evaluation of Coalbed Methane Well with Geophysical Logging-Derived Tectonically Deformed Coal |
| title_full_unstemmed | Productivity Evaluation of Coalbed Methane Well with Geophysical Logging-Derived Tectonically Deformed Coal |
| title_short | Productivity Evaluation of Coalbed Methane Well with Geophysical Logging-Derived Tectonically Deformed Coal |
| title_sort | productivity evaluation of coalbed methane well with geophysical logging derived tectonically deformed coal |
| topic | tectonically deformed coal CBM productivity evaluation geophysical logging |
| url | https://www.mdpi.com/1996-1073/12/18/3459 |
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