论文部分内容阅读
以川东北地区飞仙关组高效气藏为例,通过能量场的数值模拟,定量-半定量地分析油气成藏关键时刻能量场控制下所发生的烃类生成、运移和聚集及储层等要素演化以及其相互作用、相互影响.指出晚三叠世—早侏罗世是二叠系烃源岩大量成油期,断层沟通油源,油气在飞仙关组古构造圈闭内聚集成大型古油藏;晚侏罗世—白垩纪大巴山前陆盆地巨厚堆积,导致古油藏被深埋,古温度达到170~210℃,古油藏发生裂解成气,古油藏成为高效气源灶;与此同时,高温环境下发生的硫酸盐热还原作用,产生大量H2S等酸性气体,使得古油藏范围内的白云岩储集层发生深部溶蚀作用,储层物性得以改善与保持;喜马拉雅运动,在大巴山前缘产生强烈变形,古气藏发生调整、降温与降压,形成现今气藏分布状态.
Taking Feixianguan Formation high-efficiency gas reservoir in northeastern Sichuan Province as an example, through numerical simulation of energy field, the hydrocarbon generation, migration and accumulation and reservoir It shows that the Late Triassic-Early Jurassic is a large amount of oil-producing period of Permian hydrocarbon source rocks, and the faults communicate with oil source and oil and gas accumulate in the ancient structural traps of Feixianguan Formation Into large-scale paleo-oil reservoirs. The late Jurassic-Cretaceous Dabashan foreland basin accumulated a huge thickness, resulting in the deep buried ancient reservoirs. The ancient temperature reached 170-210 ℃. The paleo-reservoirs were cracked into gas and the paleo-reservoirs became Efficient gas source stove; meanwhile, the sulfate thermal reduction that occurs in high temperature environment produces a large amount of acid gas such as H2S, deep dissolution of dolomite reservoirs within the paleo-oil reservoir and improvement of reservoir physical properties Maintain; Himalayan movement, produced a strong deformation in the Daba Mountains front, the ancient gas reservoir adjustment, cooling and depressurization, the formation of today’s gas reservoir distribution.