摘要
本文通过对东海陆架盆地平湖地区表层沉积物的系统应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粗的假单畴／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间接手段。在平湖地区，指示磁铁矿晶粒大小的磁性参数与化探数据具有最好的相关性。因此，运用磁性测量进行油气勘探，不应仅局限于检测磁性强弱形成的异常，而应通过系统的磁性参数测量，根据磁性矿物在类型、含量、晶粒等方面的变化特征，充分揭示烃类渗漏信息。
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.
出处
《华东师范大学学报（自然科学版）》
CAS
CSCD
北大核心
1998年第1期76-81,共6页
Journal of East China Normal University(Natural Science)
基金
国家自然科学基金!49771064
关键词
烃类微渗漏
磁性测量
沉积物
油气勘探
hydrocarbon microseepage magnetic measurement magnetite grain size
