东营凹陷南斜坡原油生物标志物特征和油源对比  

Biomarkers of Crude Oils and Oil-Source Correlation in the South Slope of the Dongying Depression

作　　者：杨子成[1] 张金亮[1] 

机构地区：[1]中国海洋大学海洋地球科学学院,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2008年第3期453-460,共8页Periodical of Ocean University of China

基　　金：国家高技术研究发展计划项目(2006AA09Z336)资助

摘　　要：对东营凹陷南斜坡沙四段油砂采样和高分辨率的GC-MS分析,研究了南斜坡沙四段原油的生物标志物特征,并且进行了油源对比,分析了原油成因。C29甾烷20S/20(R+S)和C29甾烷ββ/(αα+ββ)参数显示纯化、乐安、广利、金家和王家岗部分样品为低成熟原油。小营、正理庄、高青和王家岗部分地区样品为成熟油原油。C27/C29>1反映广利、纯化和金家母源输入有低等水生生物输入,C27/C29<1反映王家岗、草桥、高青和小营地区母源有高等植物的贡献。原油中正构烷烃主要以奇数碳占优势,碳数分布为nC14-nC34,普遍存在生物降解,个别样品正构烷烃几乎消失殆尽。多数样品Pr/Ph<1,具有明显地植烷优势,伽马蜡烷/C30藿烷分布介于0.15～1之间,说明母源沉积环境为半咸水-咸水还原沉积环境。油源对比表明博兴地区的原油主要来自于博兴洼陷的沙三、沙四上段烃源岩。纯化油田油源主要来自于利津和博兴洼陷沙四上亚段,乐安、八面河、羊角沟、王家岗、广利油田的原油来自牛庄洼陷沙四上亚段。The oil sands from the fourth member of the Shahejie Formation were collected in the south slope of the Dongying Depression. The GC-MS analysis technique was used to study the biomarker characteristics of crude oils and oil-source correlation. The results indicate that the samples in the Chunhua, Lean, Guangli, Jin- jia and Wangjigang areas are immature oils. There are mature oils in the Xiaoying, Zhenglizhuang, Gaoqing and Wangjiagang areas. The source inputs of the Guangli, Chunhua and Jinjia areas mainly came from lower algae while the source inputs of the Wangjiagang, Caoqiao, Gaoqing and Xiaoying areas primarily originated from higher plants. Biodegradation occurred in most of the crude oils, and the normal alkanes of some samples have almost disappeared completely. Odd carbon number C14-nC34 range predominated in normal alkanes. The ratios of Pr/Ph and G/C30 are less than 1 and source rocks deposited in brackish-sallne environment. Oil-source correlation reveals that the oils of the Boxing oil field came from the third and fourth members of the Boxing sag. The oils of the Chunhua oil field generated from the Lijin and Boxing sag. The oils of the Lean, Bamianhe, Yangjiaogou, Wangjiagang and Guangli oil fields mainly originated from the Niuzhuang sag. The third member and the upper part of the fourth member are two sets of source rocks, which supplied abundant hydrocarbon.

关 键 词：原油 生物标志物 油源对比 母源输入 东营凹陷 

分 类 号：P618.13[天文地球—矿床学]