准噶尔盆地玛湖凹陷北部—乌夏断裂带天然气成因与来源

发布时间：2018-05-11 05:53

本文选题：天然气 + 风城组　；参考：《天然气地球科学》2016年04期

【摘要】：针对准噶尔盆地目前勘探程度相对较高的玛湖凹陷北部—乌夏断裂带天然气特征变化较为复杂的实际,通过天然气赋存特征、天然气与相关烃源岩有机地球化学特征的详细分析,对天然气的成因与来源进行了系统的研究。研究发现,该区已有的天然气主要为原油溶解气,少量气层气主要分布在乌夏断裂带的中生界,为原油溶解气溢出而形成的浅层气。天然气以烃类化合物为主要组分,二氧化碳与氮气等非烃含量相对较低。天然气干燥系数介于0.66~0.99之间,主要为湿气,少数干气主要分布在较浅的部位,是运移分异作用较强、保存条件较好的结果。天然气成因类型主要为腐泥型和偏腐泥型的过渡型,未见腐殖型天然气。气源分析表明天然气主要来自风城组湖相腐泥型—混合型母质的烃源岩,乌尔禾组腐殖型母质烃源岩有少量贡献,佳木河组腐殖型母质烃源岩对玛湖凹陷北部斜坡区断裂发育部位的局部天然气有贡献。
[Abstract]:In view of the fact that the natural gas characteristics of the northern Mahu sag and the Wuxia fault zone in Junggar Basin are relatively high at present, the natural gas occurrence characteristics are analyzed. Based on the detailed analysis of the organic geochemical characteristics of natural gas and related source rocks, the origin and source of natural gas are systematically studied. It is found that the existing natural gas in this area is mainly crude oil dissolved gas, and a small amount of gas reservoir gas is mainly distributed in the Mesozoic of the Wuxia fault zone, which is the shallow gas formed by the oil dissolved gas spillover. Natural gas is mainly composed of hydrocarbon compounds, and the content of non-hydrocarbon such as carbon dioxide and nitrogen is relatively low. The drying coefficient of natural gas is between 0.66 and 0.99, which is mainly wet gas, and a few dry gases are mainly distributed in shallow parts, which is the result of strong migration and differentiation and better preservation conditions. The genetic types of natural gas are mainly the transitional type of sapropelic type and the partial type of sapropelic type, but no humic type of natural gas is found. Gas source analysis shows that natural gas mainly comes from the lacustrine sapromud-mixed source rock of Fengcheng formation, and the humic source rock of Wuerhe formation has a little contribution. The humic source rocks of Jiamihe formation contribute to the local natural gas in the fault development area of the northern slope of Mahu sag.
【作者单位】：中国石油大学(北京)油气资源与探测国家重点实验室;新疆油田分公司实验检测研究院;新疆油田分公司勘探开发研究院;
【基金】：国家科技重大专项项目“岩性地层油气藏成藏规律,关键技术及目标评价”(编号:2011ZX05001)下属课题“准噶尔盆地岩性地层油气藏富集规律与目标评价”(编号:2011ZX05001-006) 中国石油第四次油气资源评价项目(编号:2013E)下属课题“准噶尔盆地及外围第四次油气资源评价”(编号:2013E-050206)联合资助
【分类号】：P618.13

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