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根据莺山断陷深层天然气组成及轻烃指纹、组分碳同位素、烃源岩等地球化学分析资料,对天然气和烃源岩评价认为,营城组和沙河子组天然气主要是腐殖型和腐泥型的混合成因气,具有高—过成熟演化特征;沙河子组为好—中等烃源岩,营城组为中等—好烃源岩,有机质类型以Ⅲ型为主、Ⅰ型和Ⅱ型为辅;侏罗系为好烃源岩或非—差烃源岩,有机质类型为Ⅲ型,处于过成熟演化阶段。根据莺山断陷深层天然气和烃源岩空间分布及地球化学特征,选择营城组、沙河子组、侏罗系丰度高的烃源岩样品,利用烃源岩吸附气轻烃指纹分析及特征参数表征深层各套烃源岩,通过化学模型和智能神经网络数学模拟方法建立烃源岩贡献模板,测试了深层3套烃源岩对每口井天然气的定量贡献,沙河子组烃源岩贡献大于50%,首次认识了莺山断陷深层天然气的定量来源及各套烃源岩的贡献。
According to the composition of deep natural gas and light hydrocarbon fingerprinting, carbon isotope composition and source rock geochemical data in the Yingshan Fault Depression, the evaluation of natural gas and source rock shows that the natural gas in Yingcheng Formation and Shahezi Formation is mainly humic and Sapropel type mixed gas, with high-maturity evolution characteristics; Shahezi Formation is good-medium source rock, Yingcheng Formation is middle-good source rock, and the organic matter types are mainly type Ⅲ, type Ⅰ and Ⅱ Type; the Jurassic is good source rock or non-poor source rock, and the organic matter type is Type III, which is in the stage of over-maturation. According to the spatial distribution and geochemical characteristics of deep natural gas and hydrocarbon source rocks in the Yingshan Fault Depression, the source rocks of Yingcheng Formation, Shahezi Formation and high Jurassic abundance are selected. Characteristic parameters are used to characterize each set of source rock. The contribution model of hydrocarbon source rock is established by chemical model and intelligent neural network mathematical simulation method. The quantitative contribution of three deep source rocks to each well is tested. The source rocks of Shahezi Formation The contribution of more than 50%, for the first time to understand the quantitative natural source of deep natural gas in the Yingshan fault depression and the contribution of various sets of source rocks.