摘要
调查区位于南黄海北部盆地(34°54′～36°30′N、122°～124°E),本次调查对79个站位进行了地球化学柱状取样,获取各类指标分析测试数据134组,其中包括酸解烃、ΔC、荧光光谱、紫外吸收光谱、蚀变碳酸盐(ΔC)、甲烷碳同位素和粒度等指标。酸解烃指标与整个中国陆上盆地和东海陆架盆地相比,属中等偏低丰度,呈现弱地球化学场特征。N38 5和N38 36两个柱状样的AC1、AC2、AC3含量在垂向上具有相同的变化规律,均表现为向下增高的趋势。酸解烃和ΔC各指标等值线图显示在调查区的西北部和东北部分布有两个地球化学异常区。地球化学异常与区域构造关系密切,与高资源量坳陷、模拟生烃中心位置相符合。烃类属性的判别结果表明,烃类异常最可能属热成因烃,而且气藏的可能性大于油藏。
The survey area (34°54′～36°30′N,122°00′～124°00′E) is located in the northern South Yellow Sea basin.134 groups of samples from 79 cores gave their acid hydrocarbon, ΔC, fluorescence spectrum, ultraviolet absorption spectrum,methane carbon isotope and grain size to measurement. The yields of acid hydrocarbon belong to medium to low abundance compared with those of the subaerial basins and the East China Sea shelf basin,and show weak geochemical field features. AC1,AC2 and AC3 yields of cores N385 and N386 have the same vertical changes,both increasing upwards.The isogram of acid hydrocarbon and ΔC show two geochemical anomaly areas,respectively in the northwest and northeast of the survey areas. The geochemical anomaly areas are closely related with regional structures and in accordance with highresource sags and modeling hydrocarbon centers,indicating that hydrocarbons were formed thermally from the organic carbon of deep source rocks and then migrated to the surface. According to hydrocarbon groups and δ13AC1, the hydrocarbon is of thermal generation, and gas is more possibly to have been formed than oil.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2003年第4期39-44,共6页
Marine Geology & Quaternary Geology
基金
地质大调查项目"南黄海选定海域1:50万油气地球化学勘查
关键词
表层沉积物
烃类
地球化学探测
南黄海
surface sediments
hydrocarbon
geochemical exploration
the South Yellow Sea
