东海外陆架残留沉积中硫复铁矿的发现及其油气指示意义

王张华; 陈中原

东海外陆架残留沉积中硫复铁矿的发现及其油气指示意义

华东师范大学地理系、教育部城市与环境开放实验室!上海200062

基金项目: 华东师范大学青年科研创新基金资助项目

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出版历程
- 收稿日期: 2000-10-20
- 修回日期: 2001-02-26

Greigite in relict sediments, East China Sea continental shelf:implication for hydrocarbon seepage

Urban & Environmental Open Laboratory, Ministry of Education, East China Normal University, Shanghai 200062, China

摘要

摘要: 1994～1995年间在东海外陆架获取370个柱状样,每个样长约为2～4m.对其底部沉积物作了磁性测试,发现局部地区存在SIRM异常高现象.由磁参数推断导致SIRM异常的矿物为硫复铁矿.将磁性异常地区沉积物作矿物磁选,对磁选所得矿物做扫描电镜、电子探针和能谱、X衍射及穆斯堡尔谱测试,证实了次生硫复铁矿的存在.结合本区新生代油气构造圈闭和残留沉积物可溶铁Fe³⁺/Fe²⁺比值异常的分布,用油气渗漏解释了SIRM异常及硫复铁矿的成因,从而认为SIRM异常对深部油气藏具有指示意义.
- SIRM异常 /
- 硫复铁矿 /
- 油气渗漏 /
- 残留沉积 /
- 东海外陆架
Abstract: Three hundred and seventy vibrocores were obtained from the East China Sea continental shelf during 1994~1995,aiming at surface geochemical exploration for oil and gas.Samples from the bottom o f each vibrocore were tested for magnetic properties.The result demonstrates there exist SIRM anomalies in the study area.It is suggested that greigite is the mineral causing the SIRM highs according to the magnetic properties.Magnetic minerals were separated from the high SIRM sediments to further identify them.Analyses conducted by scanning electron microscopy attached with energy dispersive X-ray analysis,X-ray diffracto grams,and Mssbauer spectrum prove that the magnetic separations are predominantly greigite and pyrrhotite.Distribution of SIRM highs in the study area coincides with that of the tectonic contr olled hydrocarbon traps and surface geochemical anomalies.This suggests that the greigite generating the SIRM anomalies of the study area is products of hydrocarbon seepage.It is thus proposed that SIRM can be selected as a proper parameter for magnetic detection of oil fields in the study area.
- SIR Manomaly /
- greigite /
- hydrocarbon seepage /
- relict sediments /
- East China Sea continental shelf

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参考文献(16)

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