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柴达木盆地西部古近系(E)—新近系(N)盐湖相烃源岩有机质丰度偏低,而且非均质性严重,利用有限的岩心岩屑实验室分析资料很难对其作出客观评价。为此综合有机地球化学和测井信息,建立了一套测井评价方法,得到了海量的烃源岩评价参数。分析这些数据后发现:与膏盐或芒硝互层的泥页岩和含膏盐泥页岩有机质丰度高(TOC>1.0%)、类型好,是该区的优质烃源岩;还分析了不同层系优质烃源岩分布规律:其中,E32优质烃源岩是主力生烃灶,其次是E31,而N11和N12中优质烃源岩则不太发育。
Organic matter abundance is low in the Paleogene (E) -New Member (N) salt lake facies in the western Qaidam Basin, and its heterogeneity is serious. It is difficult to use limited laboratory core analysis data objective comment. Therefore, based on the integrated organic geochemistry and well logging information, a set of logging evaluation methods was established and a large number of evaluation parameters of source rocks were obtained. After analyzing these data, it was found that the shale with mud salt or glauberite has high organic matter abundance (TOC> 1.0%) and good type, which is a good source rock in this area. The distribution pattern of high-quality source rocks in different strata: Among them, E32 high-quality source rock is the main hydrocarbon generating stove followed by E31, whereas the high-quality source rocks in N11 and N12 are less developed.