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On abiogenic natural gas

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Chinese Science Bulletin 1997年第16期42卷 1327-1337页

作者： Wang, XB Li, CY Chen, JF Xia, XY Guo, ZQ Xie, HS Chinese Acad Sci Lanzhou Inst Geol Lanzhou 730000 Peoples R China Daqing petr explorat bur Daqing Inst Petr Explorat & Dev Daqing 163000 Peoples R China Chinese Acad Sci Inst Geochem Guiyang 550002 Peoples R China

NATURAL gases usually refer to the inflammable gases dominated by methane from the angle of research on energy gases. Three genetic types of natural gases can be recognized according to the process of methane generation: (ⅰ) biogenic (bacterial) gas, mainly the gas formed by the decomposition of organic matter in sediments under the action of anaerobic bacteria; (ⅱ) thermogenic gas, mainly the gas formed by the degradation of organic matter in sediments under the action of certain temperature and pressure; (ⅲ) abiogenic gas, mainly the

关键词： abiogenic natural gas.

Deep seismic reflection profiling revealing the complex crustal structure of the Tongling ore district

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Science China Earth Sciences 2004年第3期47卷 193-200页

作者： L5 Qingtian1, HOU Zengqian1, ZHAO Jinhua1, SHI Danian1, WU Xuanzhi1, CHANG Yinfo1, PEI Rongfu1,HUANG Dongding2 & KUANG Chaoyang2 1. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China 2. The Sixth Geophysical exploration Brigade, petroleum bureau of East China, Nanjing 210009, China Chinese Acad Geol Sci Inst Mineral Resources Beijing 100037 Peoples R China petr bur E China Geophys Explorat Brigade 6 Nanjing 210009 Peoples R China

The deep seismic profiling across the Tongling ore district reveals a complex crustal structure. Strong contrasting dipping layered reflections (4—11 s, TWT),which dominate the lower crust of the northern part of the profile, are interpreted as the underplating of the basalt related to extensional tectonism. In the south of the profile, the Yangtze craton is characterized by strong reflections in the middle crust, showing a distinct two-layer crustal structure. Over the region of the Tongling uplift, there appear the complex arc shape reflections, suggesting folded, faulted and intruded structures, and the transparent zone below them reveals the existence of batholith. The south dipping strong reflections between the upper crust and lower crust (4—7 s, TWT) suggest a detachment between them. The detachment provided space for the magma intrusion, and caused the formation of the batholith. The Yangtze craton has a clear Moho re-flection, while the Tongling uplift has a weak Moho, whereas below the reflective lower crust in the northern part of the profile, there are sub-Moho reflections. The abrupt variation of the Moho characteristics within a short distance indicates the complexity of magmatic activity.

关键词： metallogenic belt, ore district, deep seismic profiling, crustal structure.

A model for carbon isotope distribution of methane duringdiagenesis

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Chinese Science Bulletin 1998年第7期43卷 576-578页

作者： Ping Guan Yongchang Xu Wenhui Liu Darui Wang Peking Univ Dept Geol Beijing 100871 Peoples R China Chinese Acad Sci Lanzhou Inst Geol Lanzhou 730000 Peoples R China Res Inst petr explorat & Dev Beijing 100083 Peoples R China

The evolution of methane carbon isotope with depth has been discussed based on diagenetic reaction kinetics and isotopic Rayleigh fractionational theory. A mathematical model to describe data of methane carbon isotope... 详细信息

关键词： methane carbon isotope maturity Rayleigh fractionation.