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| Physical characteristics of coalbed methane reservoir in Heshun Area of Qinshui Basin |
| Li Qiong1,2, He Jianjun1,3, Cao Jun3 |
1. Key Laboratory of Earth Exploration and Infor-mation Techniques of the Ministry of Education,Chengdu University of Technology, Chengdu, Si-chuan 610059, China;
2. College of Ueophysics, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
3. Chengdu University of Technology, Chengdu, Sichuan 610059, China |
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Abstract Aiming at a favorable coalbed methane area in Heshun region of Qinshui Basin,we obtain and analyze the related geological data in different coal mines.We also collect coal samples and roof rock samples in downhole.Including to coal samples collection,preparation,testing and analysing technotogy.A basic rock physical parameter experiment testing technology under strata temperature and pressure is initially formed by ultrasonic testing.Using MTS(a rock mechanics test system), we obtain rock physical parameter data in favorable coalbed methane zones,the distribution of coalbed density,and the distribution of P-wave and S-wave velocities.According the analysis,we find a good linear relationship between P-wave velocity and Swave velocity of coal samples.There are some differences in terms of the P-wave and S-wave attenuations between coal samples and roof samples. Between coal seam and cap rock,elastic characteristics are obviously different with stronger anisotropy.These characteristics may lay a foundation for numerical simulations of the rock physical model and wave field characteristics analysis.It may also provide a tool to predict coalbed methane.
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Received: 30 October 2012
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2013, Vol. 48 
