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民丰地区裂解气藏形成于超压环境,但后期泄压过程使现今气藏基本处于静水压力状况,对气藏超压释放机理进行深入研究有助于油气运聚及分布的研究。研究认为,研究区超压释放机理主要包括饱和天然气藏深埋、轻烃扩散作用、热流值降低、地质体较致密时的沉积深埋、渗析作用。其中,饱和天然气藏的深埋和轻烃扩散是导致研究区裂解气藏超压释放的关键因素。
The pyrolysis gas pool formed in overpressure environment in Minfeng area, but in the late stage of pressure relief process, the current gas reservoirs are basically in hydrostatic pressure condition. The in-depth study on the mechanism of overpressure release in gas reservoirs contributes to the study of hydrocarbon migration and accumulation. The study shows that the mechanism of overpressure release in the study area mainly includes deep buried natural gas reservoirs, light hydrocarbon diffusion, lower heat flux, deeper sedimentation and dialysis when geologic bodies are denser. Among them, the deep buried and light hydrocarbon diffusion of saturated natural gas reservoirs are the key factors leading to the overpressure release of pyrolyzed gas reservoirs in the study area.