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《Earth Science Frontiers》 2009-01
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Present research status of the deep fluid and their effectiveness on oil/gas generation

Wu Minghui1,3 Zhang Liuping2 1.School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China2.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China3.Research Institute of Petroleum Exploration and Development, SINOPEC, Beijing 100083, China  
The understanding of the formation of petroleum is deepened as the study of the sedimentary basin is advanced from its framework into its interior fluids and their interactions between different layers. The deep fluid is an important factor influencing the formation of petroleum. Based on the isotopic characteristics of the deep fluid that entered into the basin, two different kinds of style can be recognized. Under the high oxygen fugacity condition, the fluid is composed of CO2+H2O (rich CO2 fluid); under the low oxygen fugacity, the fluid is composed of CH4+H2+H2O(rich H2 fluid). The formation of hydrocarbon from organic matter degradation is a lacking hydrogen process; the H2 rich fluid can compensate the hydrogen in this process, and increase the production rate of hydrocarbon. The CO2 rich fluid can rebuild the pore space forming a mixed pore network composed of both original and derived pores and improving the physical properties of the reservoir.
【Fund】: 国家自然科学基金项目(40373029);; 国家重点基础研究发展计划“973”项目(2004CB720503)
【CateGory Index】: P618.13
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