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FUNCTION OF DISCORDOGENIC FAULTS DURING FORMING OF HYDROCARBON POOLS

Guo Zhanqian; Xiao Deming; Tang Jinsheng(Research Institute of Petroleum Exploration and Development, Daqing)  
Generally viewing, in important hydrocarbon-bearing basins, such as Songliao, Bohai Gulf,Jianghan ,and Nanhai basins in rift system of eastern China ,distributions of oil and gas fields are associated with the discordogenic faults of rift basement of basin ,the Earth's crust or lithosphere. By analyzing the correlativity of discordogenic faults with deposition ,tectonic ,geothermal field and pressure field, it is found that discordogenic faults control the distribution of depositional systems and sedimentary facies zones, and control the distribution of geothermal field. Thus ,discordogenic faults control the generating ,reservoir and capping factors in forming of hydrocarbon pools. Discordogenic faults also control the distribution of structural zones in basins ,and the distribution of flowing fluid pressure field. Thus ,also control the migration and accumulation factors for forming of hydrocarbon pools. So discordogenic faults control the distribution of hydrocarbon pools in hydrocarbon-bearing basins. Discordogenic fault is important for predicting distribution of oil and gas fields. To find out the distribution of discordogenic faults is an important way for improving the successful rate of exploration
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