东营凹陷深层沙河街组天然气生成动力学研究

对东营凹陷北部的民丰、胜坨和利津等地区深部地层的地球化学特征进行了分析,结果表明该地区发现的天然气可能来源于沙河街组沙四段高成熟烃源岩在渐新世形成的"古油藏".根据各深洼和"古油藏"埋藏史特征,利用烃源岩和原油生气模拟实验得到的活化能等动力学参数,给出了天然气生成量与地质年代的数量关系,明确了民丰洼陷天然气藏的形成过程.鉴于中国东部断陷盆地的深层天然气勘探潜力大,因而该文对深层天然气勘探具有一定的指导意义.

Study on kinetics for generating natural gas of Shahejie Formation in deep-buried sags of Dongying Depression

The investigation on geologic and geochemical characteristics of deep-buried sags such as the Minfeng, Shengtuo and Lijin in Dongying Depression showed that the discovered natural gases might come from the lower part of the Shahejie Formation and the “ancient oil reservoir” generated in the Oligocene epoch. A series of thermal simulations on the gaseous hydrocarbon generated from source rocks were conducted. The activation energy for different gaseous component reactions was calculated. The activation energy of gaseous hydrocarbon generated from source rock or oil was used to describe the quantitative relations of gas production from source rock or oil with geological time. A reasonable explanation to origin of gas pools found in the Minfeng area was given. Because gas exploration in the deep-buried sags of East China is perspective for sufficient gas reserves, it is important to assess gas accumulation in this area.