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首页> 外文期刊>Energy Exploration & Exploitation >Differential hydrocarbon enrichment in deep Paleogene tight sandstones of the Dongpu Depression in Eastern China
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Differential hydrocarbon enrichment in deep Paleogene tight sandstones of the Dongpu Depression in Eastern China

机译：中国东浦坳陷深古古代砂岩的差分碳氢化合物富集

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摘要

To clarify the characteristics and enrichment rules of Paleogene tight sandstone reservoirs inside the rifted-basin of Eastern China, the third member of Shahejie Formation (abbreviated as Es3) in Wendong area of Dongpu Depression is selected as the research object. It not only clarified the geochemical characteristics of oil and natural gas in the Es3 of Wendong area through testing and analysis of crude oil biomarkers, natural gas components and carbon isotopes, etc.; but also compared and explained the types and geneses of oil and gas reservoirs in slope zone and sub-sag zone by matching relationship between the porosity evolution of tight reservoirs and the charging process of hydrocarbons. Significant differences have been found between the properties and the enrichment rules of hydrocarbon reservoirs in different structural areas in Wendong area. The study shows that the Paleogene hydrocarbon resources are quasi-continuous distribution in Wendong area. The late kerogen pyrolysis gas, light crude oil, medium crude oil, oil-cracked gas and the early kerogen pyrolysis gas are distributed in a semicircle successively, from the center of sub-sag zone to the uplift belt, that is the result of two discontinuous hydrocarbon charging. Among them, the slope zone is dominated by early conventional filling of oil-gas mixture (at the late deposition period of Dongying Formation, about 31-27 Ma ago), while the reservoirs are gradually densified in the late stage without large-scale hydrocarbon charging (since the deposition stage of Minghuazhen Formation, about 6-0 Ma). In contrast, the sub-sag zone is lack of oil reservoirs, but a lot of late kerogen pyrolysis gas reservoirs are enriched, and the reservoir densification and hydrocarbon filling occur in both early and late stages.
机译：为了澄清中国东部五裂盆地古雄性砂岩水库的特点和丰富规则，选择了东浦坳陷文正区沙河杰形成（缩写为ES3）的第三次成员作为研究对象。它不仅通过试验和分析原油生物标志物，天然气组分和碳同位素等，不仅阐明了WENDONG地区ES3的石油和天然气的地球化学特征。而且还通过匹配紧密储存器的孔隙演化与烃的充电过程之间的关系来比较和解释了斜坡区和子凹槽区域中的油气储存器和亚下凹槽的类型和基因。文东地区不同结构区域的碳氢化合物储层的性质与富集规则之间已经发现了显着差异。该研究表明，古雄烃资源是文东地区的准连续分布。晚期性热解气，浅原油，中质原油，油裂气体和早期的激素热解气体连续分布在半轴上到隆起带的中心，这是两个的结果不连续的碳氢化合物充电。其中，斜坡区是通过早期传统的油气混合物填充（在东营地层晚期沉积期间，约31-27mA前）主导，而储存器在没有大规模的烃的后期逐渐致密化充电（由于Minghuazhen形成的沉积阶段，大约6-0 mA）。相比之下，亚落下区域缺乏储油液，但富含了许多晚期的激素热解气体储层，并且在早期和晚期阶段发生储层致密化和烃填充物。

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