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| An exploration model of gas hydrate in Sanlutian permafrost region, Qilian Mountain |
| SUN Zhong-Jun1, 2, FANG Hui1, 2, LIU Jian-Xun1, 3, ZHANG Shun-Yao1, 2, 3 |
1. National Modern Geological Exploration Technology Research Center, Langfang 065000, China;
2. Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, China;
3. Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China |
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Abstract Gas hydrate in Sanlutian area of Qilian Mountain is different from that of marine gas hydrate, and hence it is very urgent to study geosicience and exploration model. According to the theory of petroleum system and the achievements of geology, geography, geochemistry and drilling, the authors created a four-in-one geological model for gas hydrate deposit. Based on the summary of geophysical and geochemical exploration in recent years, the authors further established a model of gas hydrate exploration in permafrost region. Various geochemical indicators show top anomaly, annular anomaly and negative anomaly. Continuous distribution of high resistance was detected by audio magnetotelluric survey (AMT), the feature of ground penetrating radar is high-speed electromagnetic wave, slow attenuation and obvious reflected signal along bottom boundary of permafrost. The seismic indicators of ore-controlling fault find expression in such phenomena as faulting, termination, distortion, mutation or bifurcation in accordant axis of reflection wave, and the feature of AMT is electrical discontinuity. The reflected signal in gas hydrate bed is low velocity, high frequency and weak amplitude. The logging response is high resistivity, low acoustic time, low natural gamma and low density.
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Received: 08 September 2017
Published: 20 December 2017
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