南海北部边缘盆地非烃气分布及形成的地质条件与控制因素  

NON-HYDROCARBON GAS DISTRIBUTION AND ITS GEOLOGICAL CONDITIONS AND CONTROLLING FACTORS IN THE MARGINAL BASIN OF NORTHERN SOUTH CHINA SEA

作　　者：何家雄[1] 马文宏 陈胜红 龚晓峰[1] 

机构地区：[1]中国科学院边缘海地质重点实验室,广州510640 [2]中海石油有限公司湛江分公司,湛江524057 [3]中海石油有限公司深圳分公司研究院,广州510240

出　　处：《海洋地质与第四纪地质》2011年第2期95-104,共10页Marine Geology & Quaternary Geology

基　　金：国家重点基础研究发展规划项目(2007CB41170501;2009CB219501)

摘　　要：南海北部边缘盆地迄今勘探发现的非烃气主要为不同成因类型的CO2和N2,这些非烃气的形成主要取决于具体的地质条件与成藏控制因素。壳源型及壳幔混合型CO2和壳源型有机成因及壳源型有机—无机混合成因N2主要富集于西北边缘走滑伸展型的莺歌海盆地中央泥底辟带浅层,受控于海相含钙砂泥岩与泥底辟热流体上侵活动的物理化学综合作用;而火山幔源型CO2则主要展布于东北边缘断陷裂谷型的琼东南盆地东部及珠江口盆地凹陷与凸起边缘的深大断裂带附近,其火山幔源岩浆脱排气活动与深大断裂导气输送作用的配置,控制了这种类型CO2的运聚乃至富集成藏过程。Non-hydrocarbon gases,such as CO2（carbon dioxide） and N2（nitrogen）,have been discovered in the marginal basin of northern South China Sea.The formation and accumulation of these gases require some specific geological conditions and controlling factors.The CO2 of Crustal type and crust-mantle mixed type and the N2 of crustal organic type and crustal organic-inorganic hybrid type are mainly enriched in the shallow part of the central diapir area of the Yinggehai basin along the northwest strike-slip extensional edge of the northern South China Sea,under the joint control of marine calcareous shale and the physical and chemical activities caused by the heat flow derived from mud diapiric intrusion;and the mantle-type volcanic CO2 is mainly distributed around the deep faults on the borders of the depressions in the eastern Qiongdongnan basin and along the salients in the Zhujiangkou basin.The degasification of the volcanic mantle provided the gas sources and the deep faults were the path for gas migration to traps.

关 键 词：盆地结构类型 非烃气分布 形成地质条件 主要控制因素 南海北部 

分 类 号：P744.4[天文地球—海洋科学]