东海陆架表层沉积物的磁性测量及其油气勘探意义

本文通过对东海陆架盆地平湖地区表层沉积物的系统磁性测量和化探指标分析，揭示烃类微渗漏对沉积物磁性特征的影响，探讨磁性测量方法在表层油气勘探中的应用前景。研究表明，平湖地区表层沉积物中主要的磁性矿物为磁铁矿，一般磁性较弱沉积物中磁铁矿晶粒以单畴（ＳＤ）为主，而磁性较强的沉积物中以较烃的假单畴／多畴（ＰＳＤ／ＭＤ）为主，磁性参数与化探数据酸解烃，蚀变碳酸盐存在明显的相关性，表明磁性测量可作为油气勘探的

Magnetic Measurements on Surface Sediments from East China Sea Continental Shelf and Its Potential Application in Oil and Gas Exploration

Based on the combined magnetic measurements and geochemical analyses on the surface sediments from the continental shelf of East china Sea, this paper aims to reveal the impactof hydocarbon microseepage on the magnetic properties of surface sediment, and demonstrate the potential use of magnetic measurement in oil and gas exploration. It's revealed that the magnetic mineral is dominated by magnetite, with SD magnetic dominant in weak magnetic samples and PSD/MD strong magnetic samples in general. There is obvious correlationship between magnetic parameters and the geochemical indexes of acid - extracted hydrocarbons and delta carbonate, suggesting magnetic measurement can be used as indirect tool in oil and gas exploration. It is found that the parameters indicating the grain size of magnetite have the best correlation coefficients with geochemical indexes. Therfore the application of magnetic measurements in oil and gas exploration should not be limited to the detection of magnetization anomaly.An integrated study of the change on magnetic mineral type, content and grain size should be carried out to reveal the evidence of hydrocarbon microseepage thoroughly.