Mango轻烃参数的开发与应用

通过对塔里木盆地５４０个原油样品轻烃资料的系统研究，发现石油中４个异庚烷的比值（Ｋ１）不是一个常数，其变化范围在０．７４０～１．５４０之间，导致Ｋ１值变化的主要原因可能是烃源岩沉积介质中酸性催化剂催化作用的强弱。探讨了２，３二甲基戊烷／２，４二甲基戊烷比值与常用成熟度参数（庚烷值、甲基菲指数１、甲基菲指数２、Ｃ２９甾烷异构化比值）之间关系，结果表明２，３二甲基戊烷／２，４二甲基戊烷比值是一个有效的成熟度参数。利用Ｍａｎｇｏ提出的Ｃ７烃类形成动力学模式关系图及环优势参数，对塔里木盆地原油进行了对比与成因分类。图５表１参１２（邓春萍摘

Development and application of Mango's light hydrocarbon parameters.

Light hydrocarbons of 540 oils in Tarim basin are studied systematically. The results show the ratio values of four isoheptanes (K 1) in petroleum are variant, ranging from the lowest of 0.740 up to highest of 1.540. The K 1 value variance of crude oils can suggest the difference of acid catalysis in depositional environment for source rocks. In this paper, the relationship between the ratio of 2,3 dimethylpentane over 2,4 dimethylpentane and maturity parameters, including Heptane value, Methylphenanthrene index 1, Methylphenanthrene index 2, the ratio of C 29 20S/(20S 20R) are studied. The results suggest the ratio of 2,3 dimethylpentane over 2,4 dimethylpentane can be a efficient maturity parameter. Therefore, based on the kinetic model for C 7 light hydrocarbons formation and ring preference, oil oil correlation and genetic classification of crude oils in Tarim basin are performed.