油气化探异常模式

以判断深部油气藏的性质和保存状态,为油气勘探部门提供可靠的地球化学依据。化探是油气勘查的一种手段,它建立在烃类垂向微运移的理论基础之上。通过对油气化探指标的讨论,认为土壤中的次生烃类、热释汞和甲烷同位素是油气化探的有效指标;讨论了油气化探中异常的形成模式,根据地表地球化学异常特征及形态组合可以判断深部油气藏的性质和保存状态,为油气勘探部门提供可靠的地球化学依据。

ANOMALY MODEL FOR OIL AND GAS GEOCHEMICAL EXPLORATION

Geochemical exploration for oil and gas is based on the vertical micro-migration theory of hydrocarbons.Based on a comprehensive discussion of the indexes of oil and gas geochemical exploration,the authors hold that hydrocarbon,pyrolysis-Hg and methane isotope in the soil are effective indexes for oil and gas geochemical exploration.The model of anomaly is also discussed.According to the surface geochemical anomaly characteristics and combined modeling,the property and preservation situation of a deep oil and gas pool can be judged,which provides a dependable geochemical basis for oil and gas exploration.