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| PHYSICAL CHARACTER ANALYSIS OF LOGGING DATA FOR NATURAL GAS HYDRATE IN QILIN MOUNTAIN PERMAFROST AREA |
| LIN Zhen-zhou1, LI Yang1, GAO Wen-li1, KONG Guang-sheng1, SUN Shang-zhe2 |
1. Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, China;
2. No. 145 Geological Party, Bureau of Coal Geology of Gansu Province, Zhangye 734000, China |
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Abstract This paper aims at obtaining a calculation equation for the formation porosity and natural gas hydrate content applied to Qilian Mountain permafrost area. Based on the laboratory test data of two cores, the authors adopted the multiple linear regression to get the porosity calculation equation applicably. And by referring to the relevant data obtained both in China and abroad, the mofified Archie Equation was employed to calculate the hydrate concentration and to get the concentration values of five hydrate formations with log data. A comparison with the value obtained from the univariate equation shows that the value from the ternary linear regression porosity equation can achieve better accuracy (up to 85%) with the test data of the core. The value range of the hydrate concentration is between 11.47% and 81.61%. The results obtained by the authors can provide valuable reference for the evaluation of the natural gas and hydrate in this area.
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Received: 09 October 2012
Published: 10 October 2013
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