Geochemical characterization of Lucaogou Formation and its correlation of tight oil accumulation in Jimsar Sag of Junggar Basin, Northwestern China.
Geochemical characterization of Lucaogou Formation and its correlation of tight oil accumulation in Jimsar Sag of Junggar Basin, Northwestern China.
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DOI：
10.1007/s13202-017-0335-1
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发表时间：
2017
影响因子：
2.2
通讯作者：
Wang Z
中科院分区：
文献类型：
--
作者：
Qu J;Ding X;Zha M;Chen H;Gao C;Wang Z
随着常规油气资源的不断消耗，致密油等资源潜力巨大的非常规油气资源逐渐受到重视，成为新的勘探领域。吉木萨尔凹陷是准噶尔盆地致密油勘探开发的重点区块。根据地质、试油、测井、岩石薄片、地球化学等资料，研究了二叠系芦草沟组烃源岩的地球化学特征及其与致密油成藏的关系。烃源岩有机质丰度高，有机质类型以I型和II型为主，有机质成熟度处于低成熟-成熟阶段。油源对比结果表明，低硫区原油主要来自低硫区内部的烃源岩。LCG致密油主要分布在烃源岩厚度大、有机碳含量大于3.5%的平面上。表明烃源岩对致密油的形成和聚集具有明显的控制作用。
With the constant consumption of conventional oil and gas resources, unconventional oil and gas resources with great resource potential such as tight oil have gradually been valued and become the new exploration area. Jimsar Sag is the key tight oil exploration and development block in Junggar Basin of Northwestern China. Based on the data sets of geology, oil production test, logging, rock thin section, and geochemistry of Permian Lucaogou Formation (LCG), we studied the geochemical characteristics of hydrocarbon source rocks and their relation to the tight oil accumulation. Organic matter abundance of source rocks is high, the types of organic matter are mainly type I and type II, and the organic matter maturation is in the low mature stage to mature stage. Results of oil source correlation showed that the crude oil of sweet spots was mainly derived from the source rocks in the interior of the sweet spots. The LCG tight oil is mainly distributed in the plane where the source rocks have great thickness and the TOC is higher than 3.5%. It shows that the source rocks have obvious controlling on the occurrence and accumulation of tight oil.