苏丹裂谷盆地原油轻烃地球化学特征

Mango发现4个C₇的异构化合物相对组成有显著的不变性，并提出了稳态催化轻烃成因 模式，推导出K₁值、环优势和原油生成温度等参数，这些参数适用于原油分类和成熟 度 指标，为研究原油轻烃地球化学特征提供了新思路。以苏丹裂谷盆地为例，计算了原油的Ma ngo轻烃参数，发现K₁的平均值为1.05，与Mango提出的K₁值相对稳定的观点吻 合该 盆地6区Moga\|22井、Fula N-6井和Fula C-1井原油具六元环优势，而6区Naha-1井和4区 Balome-1井原油具三元环优势，表示其母质类型有异，3区和7区原油成熟度最低，4区原油成熟度最高，而6区原油成熟度位于7区和4区原油的该值之间。

GEOCHEMICAL CHARACTERISTICS OF LIGHT HYDROCARBONS FOR CRUDE OILS FROM RIFT BASINS IN SUDAN

Mango discovered that the relative composition of 4 isomer of C₇ has c onspicuous invariance. Thus the steady-state catalytic model for the formationof light hydrocarbons was proposed, and parameters of K-1, crude oil generation te mperature and ring preference, which adapt to oil classification and maturity c alculation, were deduced. These parameters provided new insight for the research of light hydrocarbons in crude oil. This article take the rift basins in Sudan as an example, and Mango's light hydrocarbon parameters of crude oil are calcula ted. As a result, the mean value of K1 is 1.05, which is in accordance with thehypothesis proposed by Mango. The crude oil from Moga-22 well, Fula N-6 well an d Fula C-1 well in block 6 has six-membered ring preference，however, the cru de oil from Naha-1 well in block 6 and Balome-1 well in block 4 has three-membe red ring preference, showing the diversity of their parent material types. The oil maturity of block 3 and block 7 is the lowest, while the value of block 4 is thehighest, and the value of block 6 is between them.