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Sun Z.,Chinese Academy of Geological Sciences | Yang Z.,Chinese Academy of Geological Sciences | Mei H.,AE and E Geomicrobial Technologies Beijing Inc. | Qin A.,Chinese Academy of Geological Sciences | And 4 more authors.
Journal of Geochemical Exploration | Year: 2014

In this study, the Muli gas hydrate reservoir in the Qilian Mountains was chosen as a test area for the geochemical exploration of gas hydrates in mid-latitude regions. Soil headspace gases, acid-extracted hydrocarbons and stable carbon isotopes of methane, and soil magnetic susceptibility as well as microbes were tested. The results show that the distribution of geochemical anomalies can be well correlated with the underlying gas hydrate reservoir. Acid-extracted hydrocarbons, soil headspace gases, and the stable carbon isotopes of methane can be considered as major indicators for geochemical exploration of gas hydrates, whereas magnetic susceptibility and microbes served as complementary indicators. The stable carbon isotopes of methane and the hydrocarbon composition of the surface geochemical anomalies indicated a thermogenic origin, which shows that the gas source of the potential gas hydrate reservoir in this area may be contributed by deep oil and coal-formed gases. An accumulation model for the gas hydrate reservoirs was also developed and an integrated exploration project for gas hydrate, oil and coal bed methane is also proposed for the Muli area. © 2013 Elsevier B.V. Source

Zhang C.,China University of Petroleum - Beijing | Zhang C.,AE and E Geomicrobial Technologies Beijing Inc. | Pang X.,China University of Petroleum - Beijing | Mei H.,AE and E Geomicrobial Technologies Beijing Inc. | And 5 more authors.
Shiyou Kantan Yu Kaifa/Petroleum Exploration and Development | Year: 2010

To effectively detect lithologic biogas reservoirs in the Sanhu Depression, an experimental investigation of Microbial Oil Surveying Technique (MOST) was conducted in the Tainan-Taidong area. Samples were from 156 sampling stations located 150 m apart in a near straight line of 24 km and extending from the west to the east of the investigated area, 200 g of soil from each sample site was taken at depth of 20 cm, and GMT Inc. of U.S.A. completed the analysis of soil methanotrophs. The result shows that moisture of soil at depth of 20 cm can maintain the growth of methanotrophs; The average of soil pH is 8.20, which does not inhibit the growth of methanotrophs; The salinity of many samples are more than 20%, the high salinity decreases methanotrophs concentrations, but the difference of methanotrophs concentrations between gas reservoirs and background areas is obvious, and the samples above gas reservoirs whose salinity are more than 50% still have microbial anomaly; Gas well testing production shows a significant positive correlation with methanotrophs concentrations of soil above the well, indicating the MOST is applicable to the Sanhu Depression. According to the microbial anomaly, two favorable exploration targets were identified in the eastern side of Well Tainan 9 and the western side near the limits of the Tainan gas field, their gas bearing abundance is better than the Well Tainan 9. Source

Mei B.-W.,AE and E Geomicrobial Technologies Beijing Inc. | Wu M.,AE and E Geomicrobial Technologies Beijing Inc. | Sun Z.-J.,Chinese Academy of Geological Sciences | Yang Z.-B.,Chinese Academy of Geological Sciences | And 4 more authors.
Geological Bulletin of China | Year: 2011

The gas hydrate-discovering well in the Muli coalfield was chosen as the analog model in this test to study the applicability and reliability of the microbial geochemical (MGCE) detection method in exploring onshore natural gas deposits. A positive correlation was detected between the surface soil microbial anomaly of the permafrost zone and the abundance of the subsurface gas hydrate deposit. Therefore, this method could sensitively and effectively predict the distribution of gas hydrate accumulations. In the exploration block, a mixed gas source was detected. The gas is dominantly thermogenic and subordinately of biogas source. The result of the test proves that the microbial geochemical exploration method is a sensitive, fast and cost-effective technique for exploring gas hydrate and petroleum reservoirs in Tibetan Plateau permafrost region and therefore could be widely employed in this region. Source

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