陕北高精度磁测找油探讨

在陕北进行高精度磁法找油是非地震方法在此区的一次尝试。通过地面及井中岩石磁化率测定,其地表黄土及侏罗系、三叠系岩石磁性都不强,在富油区40～110m埋深处,岩石磁化率值偏高。为磁法找油的机理研究和富油区上方磁异常模式的建立提供了依据。通过对次生成岩磁铁矿产状分析及已知区实测资料分析总结出陕北富油区上方三种磁异常模式。为了从实测资料中提取这些模式,我们采用了光滑、向上延拓、趋势分析及带通滤波等处理方法。依此对未知区进行了推断,结果与其它物探方法吻合较好。

DISCUSSION ON PROSPECTING OIL FIELDS USINGHIGH-PRECISION MAGNETIC SURVEYING IN NORTHERN SHAANXI

This paper attempts to prospect oil using high - precision magnetic surveying which is one of the non-seismic methods. According to susceptibility of rocks on the ground and in the well, we found that magnetism of Triassic and Jurassic loess and rocks on the ground is weak. Rocks between 40-110 meters under the surface in lirich oil fields have a little high rusceptibility. It provides a basis for origin study of prospecting oil using mahnetic surveying and establishment of magnetic anomalous patterns over rich oil fields. We got three types of magnetic anomalous patterns in the northern Shaanxl by means of analysis of diagenetic-magnetite occurrence and surveying data. In order to get all these patterns from surveying data, we used many data processing methods such as smoothing , upward continuation, trend analysis and band-pass filtering. From these results we interpreted the unknown area and got a good agreement with other geophysical methods.