松辽盆地南部油气化探异常成因模型

ABNORMAL GENETIC MODEL IN GEOCHEMICAL EXPLORATION OF OIL AND GAS, SOUTH SONGLIAO BASIN

本文分析了因水土两种介质物态以及其中烃气指标分布特征不同，而导致地表化探指标所反映的油气信息的差异，提出了两种介质中烃异常强度的比值规律，及其与油气藏类型和保存条件的关系；并据此评价了地层超覆带附近高值烃所对应的资源类型。在分析解剖已知油田上方化探指标的分布规律、组合特征与其石油地质特征的基础上，提出了化探异常成因模型。

This paper reveals the difference in hydrocarbon informations due to the different physical states of water and soil and their different existing conditions for hydrocarbon gas index, and presents a ratio rule of hydrocarbon anomaly strength in the two media and its relation to the type of hydrocarbon reservoirs and petroleum preservation conditions. Based on these, correspondent types of resource of high value hydrocarbon near formation overlap zone are evaluated. In the given oil fields, on the bases of analyses on distribution pattern and combination characters of geochemical exploration indices, and their relations to petroleum geological structures, the authors objectively present an genetic model of geochemical exploration abnormality,which can completely explain various patterns of currently presented geochemical exploration anomaly.