CAJ | 학술논문

对南海珠江口盆地 Site4B 站位柱状沉积物可溶有机质中正构烷烃进行详细分析，结果显示海底以下65～70 cm、80～85 cm 和85～90 cm 存在明显的似成熟烃类分布。在气相色谱质谱图上（GC-MS），该处存在明显的 UCM 分布；在烃类分布上，该处以可溶有机质中高碳数正构烷烃奇偶优势趋于消失为特征，CPI 为1．15～1．45。同时，整个剖面其他层段沉积有机质中可溶烃类仍以典型的近/现代沉积有机质输入为标志。结合区域地质背景，以及该区域天然气水合物的勘探发现事实，推断Site4B 站位海底以下65～70 cm、80～85 cm 和85～90 cm 烃类异常可能系深部烃类微渗漏所致。
대남해주강구분지 Site4B 참위주상침적물가용유궤질중정구완경진행상세분석，결과현시해저이하65～70 cm、80～85 cm 화85～90 cm 존재명현적사성숙경류분포。재기상색보질보도상（GC-MS），해처존재명현적 UCM 분포；재경류분포상，해처이가용유궤질중고탄수정구완경기우우세추우소실위특정，CPI 위1．15～1．45。동시，정개부면기타층단침적유궤질중가용경류잉이전형적근/현대침적유궤질수입위표지。결합구역지질배경，이급해구역천연기수합물적감탐발현사실，추단Site4B 참위해저이하65～70 cm、80～85 cm 화85～90 cm 경류이상가능계심부경류미삼루소치。
N-alkane components are studied in Site4B profile sediment from the Pearl River Mouth Basin,northern South China Sea,and the results reveal that “similar mature hydrocarbon”distribution is exhibited from 65 cm to 70 cm,80 to 85 cm and 85 cm to 90 cm below the sea floor.An unresolved complex mixture (UCM)of compo-nents dominates the gas chromatography mass spectrum (GC-MS)and high molecular weight n-alkanes trend to show no odd predominace with CPI from 1.15 to 1.45 in these layers.Meanwhile,in other layers,alkanes are char-acteristic of modern/recent organic matter inputs in the profile.Combined with regional geological background and the exploration of gas hydrate in this area,we may conclude that unusual distribution of alkane from 65 cm to 70 cm,80 to 85 cm and 85 cm to 90 cm below the sea floor is resulted by deep hydrocarbon microleakage.