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天然气成藏过程的有效性受成藏动力、输导体系和盖层封闭条件等主要地质因素的控制,对中国主要大中型气藏的解剖和统计分析表明,源储剩余压力差、输导体系的输导系数以及盖层厚度或排替压力可以作为评价天然气成藏过程有效性的主要指标,并建立了评价标准.利用上述评价指标对库车坳陷天然气成藏过程有效性进行了定量评价.根据库车坳陷天然气主要成藏期的源储剩余压力差、断裂输导体系的输导系数和盖层厚度等主要因素的叠合,做出了库车坳陷成藏过程有效性综合评价图.评价结果表明,吐北-大宛、克拉苏中部和东秋东-迪那地区是库车坳陷内3个高效成藏过程发育区,为天然气成藏的有利部位.
The effectiveness of natural gas accumulation process is controlled by major geological factors such as hydrocarbon-generating motivation, transport system and confinement of cap rocks. Anatomical and statistical analysis of major and medium-sized gas reservoirs in China shows that the residual pressure difference between source and reservoir, And the thickness of cover or displacement pressure can be used as the main index to evaluate the effectiveness of natural gas accumulation process and establish the evaluation criteria.The effectiveness of natural gas accumulation process in the Kuqa Depression has been quantitatively evaluated by using the above evaluation indexes According to the superposition of the main factors such as the residual pressure difference of source reservoir, the conductivity of fault system and the thickness of caprock in the main reservoir during natural gas accumulation in Kuche Depression, the effectiveness of reservoir formation in Kuqa Depression The evaluation results show that the three high-efficiency reservoir-forming development zones in Kuche Depression are the northern part of Dukun-Dawan, central Kerasu and Dongqiundong-Dina area, which are favorable sites for gas accumulation.