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江汉盆地下第三系潜江组沉积时期为一盐湖,因此,其油气生成的有机地球化学特征有别于我国东部其它陆相沉积盆地。本文以有机地球化学资料为主,结合地质、古生物资料,阐述了盐湖相沉积的油气生成特征。它主要表现为有机质的低丰度、高转化率和正构烷烃中明显的偶奇优势。同时主要依据总烃/有机碳,将有机质演化划分为四个阶段,确定了油、气生成的起始门限:深度2200米,温度90℃。利用埋深图解法,研究了生油岩的埋藏史,确定了主要生油期。
The sedimentary period of the Qianjiang Formation, a member of the Lower Tertiary in the Jianghan Basin, is a salt lake. Therefore, the organic geochemical characteristics of hydrocarbon generation are different from other continental sedimentary basins in eastern China. In this paper, organic geochemical data-based, combined with geological and paleontological data, described the salt lake sedimentary hydrocarbon generation characteristics. It is mainly manifested as the low abundance of organic matter, high conversion and the obvious even odd advantages in n-alkanes. At the same time, based on the total hydrocarbon / organic carbon, the evolution of organic matter was divided into four stages, and the initial threshold for the formation of oil and gas was determined: a depth of 2200 meters and a temperature of 90 ° C. Using buried depth graphic method, the burial history of source rock was studied and the main oil producing period was determined.