多目标地球化学勘查数据在油气化探中的应用——以宁夏盐池地区油气田为例

Application of Multi-objective Geochemistry Data to Oil and Gas Exploration:A Case Study of the Oil Field in Yanchi County of Ningxia

多目标地球化学勘查数据是在全国范围内对土壤的地球化学元素进行全面调查分析的大型数据库,若能将多目标地球化学勘查数据应用于油气化探中,将是一件非常有意义的研究。本文选择对盐池县油气田区域的多目标地球化学勘查数据进行分析,发现油田区土壤中部分元素的含量值出现异常,并且元素的异常与油气田的存在密切相关。通过对元素的平均含量、相关性及其对油气田的反映分析,发现异常元素Cu、Fe、Mn、V、Cl、S是该油区有效的化探指标。本研究有利于扩大多目标地球化学勘查数据的应用范围,使其不仅用于评价生态环境,还可以应用于油气资源的远景评价。

The data of multi-objective geochemical survey is a large-scale database resulted from a comprehensive geochemical analysis to soil all over the country. It will be of great significance if these data can be applied to oil and gas geochemical exploration. In this study, multi-objective geochem- ical data in the oil field of the Yanchi area in Ningxia are analyzed. It is found that the contents of some elements in soil are abnormal, and these anoma- lies in the upper soil are closely related with the presence of the oil and gas field. The analysis of average contents of some elements and their relation to the oil and gas field reveals that the elements of Cu, Fe, Mn, V, CI and S are effective geochemical indices directing to oil field. This would help expand the application range of multi-objective geochemical data. It can be applied to both ecological environment evaluation and prospect assessment of oil and gas resources.