决策分析在油气化探中的应用

决策分析是通过研究模型区各种化探指标间的匹配及相关关系,来确定各指标的权值并形成一个综合化探指标(即关联值),计算各样本点的关联值并与关联临界值对比达到分离背景与异常的目的.它还可以用来筛选有效指标和作为变量组合的参考.在某油气区的应用研究中,异常区与已知油气藏范围基本吻合,并与构造圈闭对应.

THE APPLICATION OF DECISION-MAKING ANALYSIS TO THE GEOCHEMICAL OIL AND GAS EXPLORATION

The decision making analysis means the study of matching relationship and correlation between various geochemical indices in the studied model area for determining weight values of various indices and forming an integrated geochemical index (association value).On such a basis,one can calculate associative values of various sample points and compare them with the associative critical value so as to achieve the aim of separating background from anomalies.It can also be used to sieve effective indices and serve as reference for variable combination.In an application study within a certain oil gas area,the anomalous area is basically consistent with the limits of the oil and gas accumulation and corresponds to the structural closure.