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油溶释放气是济阳坳陷中浅层天然气的重要来源。文中应用盆地模拟技术 ,确定了济阳坳陷烃源岩大约在 390 0m进入大量生气窗。该坳陷烃源岩埋深较浅 ,以生油为主 ,仅在洼陷的中心进入大量生气窗 ,在此基础上阐明了油溶释放气是济阳坳陷中浅层天然气的重要来源。并从油溶解气的模型出发 ,结合油气藏实测数据 ,确定了油溶解气起始脱气点的计算方法 ,建立了典型的脱气模式。认为济阳坳陷油溶解气的起始脱气深度大约在 170 0～ 2 0 0 0m之间 ,埋深小于起始脱气深度 ,可形成气层气、气顶气和夹层气等天然气藏 ;埋深在起始脱气深度至 390 0m之间 ,气藏在油中处于欠饱和状态 ,以溶解气赋存形式为主 ;深度大于 390 0m ,烃源岩才开始进入大量游离气生成阶段 ,可形成深层原生气藏
Oil-released gas is an important source of mid-shallow natural gas in Jiyang depression. In this paper, basing on the basin simulation technology, it is confirmed that the source rock in Jiyang depression enters into a large number of gas windows at about 390 0m. The source rock of the depression is shallow in depth and mainly produces oil, and only enters a large number of gas-generating windows in the center of the depression. On this basis, it is clarified that oil-dissolved release gas is an important source of medium and shallow natural gas in the Jiyang depression . Based on the oil dissolved gas model and the measured data of oil and gas reservoir, the calculation method of initial degassing point of oil dissolved gas was established, and a typical degassing mode was established. It is considered that the initial deglazing depth of oil-dissolved gas in Jiyang Depression is about 170 0 ~ 200 000 m, and the burial depth is less than the initial degassing depth to form natural gas reservoirs such as gas capitals, capitals and mezzanine gas ; The depth of buried gas is between 390 0 m and the initial gas reservoir is in a state of under-saturation in the oil, mainly in the form of dissolved gas; when the depth is more than 390 0 m, the source rocks begin to enter a large amount of free gas generation phase , Can form a deep primary gas reservoir