| 渤海海域辽东南洼斜坡带旅大29油田原油地球化学特征与油源对比 |
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| 引用本文： | 田德瑞,牛成民,王德英,潘文静,张如才.渤海海域辽东南洼斜坡带旅大29油田原油地球化学特征与油源对比[J].高校地质学报,1997,25(4):527. |
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| 作者姓名： | 田德瑞 牛成民 王德英 潘文静 张如才 |
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| 摘 要： | 辽东凹陷南洼斜坡带旅大29油田在沙河街组二段获得了高产轻质原油和天然气，展现了良好的勘探潜力。为了进一
步明确其原油母质来源、沉积环境和烃源岩层位，对原油、油砂样品和围区烃源岩样品进行了系统的地球化学分析和油源
对比。研究结果表明，原油为低硫（0.0733%）、高蜡（20.77%） 的轻质成熟原油。原油样品饱和烃色谱完整，主峰碳为
C19，显示未遭受明显生物降解作用。油砂样品埋藏较浅，部分遭受生物降解等的影响，饱和烃色谱基线呈现明显的
“UCM”鼓包现象。原油和油砂样品具有低C19 三环萜烷/C23 三环萜烷（0.10~0.18）、低C24 四环萜烷/C26 三环萜烷（0.49~
0.53）、低C27重排甾烷/C27甾烷（0.30~0.43）、中等伽马蜡烷指数（0.14~0.17） 和中等-高4-甲基甾烷参数（0.30~0.36），且
具有相对较重的全油碳同位素值（-27.1‰）。原油母质形成于淡水—微咸水的湖泊沉积环境，母源有机质以藻类等低等水
生生物为主，陆源有机质输入较少。旅大29油田原油主要来源于辽中凹陷和辽东凹陷沙三段烃源岩，同时有少量辽中凹陷
沙四段烃源岩的贡献。研究区高蜡轻质原油的形成主要受控于烃源岩母质来源，藻类等低等水生生物是高蜡轻质原油形成
的重要母质。
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Geochemistry and Oil-Source Correlation of Crude Oil in the LD29 Oilfield,Slope Belt in the Southern Sag of the Liaodong Depression,Bohai Sea |
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| TIAN Derui,NIU Chengmin,WANGDeying,PAN Wenjing,ZHANG Rucai.Geochemistry and Oil-Source Correlation of Crude Oil in the LD29 Oilfield,Slope Belt in the Southern Sag of the Liaodong Depression,Bohai Sea[J].Geological Journal of China Universities,1997,25(4):527. |
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| Authors: | TIAN Derui NIU Chengmin WANGDeying PAN Wenjing ZHANG Rucai |
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| Abstract: | High-yield light crude oils and natural gases were produced in the second member of the Shahejie Formation in the LD 29
oilfield on the slope belt in the southern sag of the Liaodong Depression, showing great exploration potential. In order to clarify oil
source, depositional environment and source rock ages, systematic geochemical analyses and oil-source correlation on crude oil, oil
sands and source rock samples were carried out. Results show that the crude oils have low sulfur (0.0733%) and high wax contents
(20.77%), and are light and mature. The saturated hydrocarbon chromatograms of the crude oils have a complete distribution with the
major peak carbon at C19, indicative of non-biodegradation. In contrast, the oil sand samples which were shallowly buried are partially
affected by biodegradation, as indicated by the UCM in the chromatographic baseline. The crude oils have low C19/C23TT (0.10-0.18),
low C24 Tet/C26TT (0.49-0.53), low C27Dia/C27ST (0.30-0.43), medium Ga/C30h (0.14-0.17) and medium-high 4-MSI(0.30-0.36), and are
characterized by relatively heavy carbon isotopic compositions (-27.1‰). Organic matter is dominated by lower aquatic organisms with
minor terrigenous inputs, which was deposited under fresh-brackish lacustrine depositional environment. The crude oils in the LD 29
oilfield are mainly originated from the third Member of the Shahejie Formation in the Liaozhong depression and Liaodong depression,
with a little contribution from the fourth Member of the Shahejie Formation in the Liaozhong depression. The formation of light oil with
high wax content in the study area is mainly controlled by the organic precursors of source rock, i.e., alginite and lower organisms |
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