摘要
微磁测量是80年代出现的一种成功的非常规油气勘探方法,它所检测的是与油气渗漏相关的次生磁性矿化作用。近期的大量研究表明,油气田上方的微磁乒常具有复杂多样的成因:(1)从烃类获得代谢能的硫酸盐还原茵的作用;(2)烃类的微生物降解作用;(3)硫化环境中形成的磁黄铁矿;(4)泥质岩中富铁粘土的自生菱铁矿化;(5)与油气源岩露头或油气藏渗漏有关的自燃变质带。此外,烃类在陆相红层中的磁效应可以受到赤铁矿溶离的干扰,使其磁化强度出现数量级的下降。
Micromagnetics is a successful unconventional method for oil and gas exploration which detects secondary magnetic mineralizations associated with hydrocarbon seepages. A lot of recent research suggests that micromagnetic anomalies above oil and gas pools may result from (1) sulfate reducing bacteria deriving metabolic energy from hydrocarbon; (2) biodegradation of hydrocarbon; (3) pyrrhotite in sulfidic environments; (4 ) sideritization of iron-rich clay minerals in argillaceous rocks; (5) spontaneous combustion-metamorpohsed zones associated with source crops and seepages of hydrocarbon. Moreover, magnetic effect of hydrocarbon in red beds can be disturbed by removal of dissolved hematite.
出处
《地质科技情报》
CAS
CSCD
北大核心
1992年第1期49-55,共7页
Geological Science and Technology Information
关键词
油田
气田
磁异常
成因
性能
secondary magnetic mineralizations, mechanism of micromagnetic anomalies, unconventional method for oil and gas exploration, micromagnetics'hydrocarbon
