| 松辽盆地西部斜坡北段油气成藏特征分析 |
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| 引用本文： | 孙国昕,冯志强,孙效东.松辽盆地西部斜坡北段油气成藏特征分析[J].地质科学,2009,44(2):478-489. |
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| 作者姓名： | 孙国昕 冯志强 孙效东 |
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| 作者单位： | 1. 中国科学院广州地球化学研究所, 广州, 510640;
2. 大庆油田有限责任公司勘探开发研究院黑龙江, 大庆, 163712;
3. 大庆油田有限责任公司, 黑龙江, 大庆, 163453 |
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| 基金项目： | 国家重点基础研究发展规划(973计划) |
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| 摘 要： | 松辽盆地西部斜坡北段油气主要来自齐家-古龙生油凹陷青山口组烃源岩，油气沿着高台子油层和萨尔图二-三油层砂体以狭窄的路径侧向西运.共发育3条运移路径，侧向运移的油气受低幅度构造、断层和地层尖灭遮挡富集成藏.西部斜坡构造幅度较低，断层规模小，平面延伸的距离短，不利于油气大规模聚集成藏，盆地边部的地层超覆带是寻找大规模地层尖灭油气藏和油砂矿的有利地区.斜坡区普遍受大气降水淋滤作用，原油受喜氧细菌的降解作用普遍稠化，沿着大气水下渗方向，原油稠化的程度越米越低，造成自西而东原油性质呈现规律性变化：地层超覆带为严重降解的稠油和油砂，断层遮挡油气聚集带为中等降解的稠油，构造-岩性油气聚集带为轻度降解的稠油和正常原油.
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| 关 键 词： | 油源 侧向运移 聚集条件 稠油 西部斜坡 松辽盆地 |
| 收稿时间： | 2007-12-18 |
| 修稿时间： | 2007-12-18; |
Characteristics of oil-gas accumulation in northern sector of the West Slope, Songliao Basin |
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| Sun Guoxin,Feng Zhiqiang,Sun Xiaodong.Characteristics of oil-gas accumulation in northern sector of the West Slope, Songliao Basin[J].Chinese Journal of Geology,2009,44(2):478-489. |
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| Authors: | Sun Guoxin Feng Zhiqiang Sun Xiaodong |
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| Institution: | 1. Guangzhou Institute of Ceochemistry, Chinese Academy of Sciences, Guangzhou 510640;
2. Exploration and Development Research Institute of Daqing Oilfield Company Gtd., Daqing, Heilongjiang 163712;
3. Daqing Oilfteld Company Ltd., Daqing, Heilongjiang 163453 |
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| Abstract: | The oil and gas in northern sector of the West Slope, Songliao Basin, sourced from Qingshankou Formation in the Qijia-Gulong Sag, Central Depression, which laterally migrated west-wards along 3 narrow pathways, and accumulated by the low-amplitude structures, barrier of faults and stratigraphic pinch outs.In the West Slope, the oil and gas were not favored to enrich in large scale, since the structures' amplitude being usually lower, the scale of the faults being smaller and the stretching distance of the faults being short.The stratigraphic overlap belt along the basin margin might be a favorable area to find large-scale stratigraphic pinch out accumulations and oil sand mines.The atmospheric water eluviation was pervasive in the West Slope, where the crude oils were generally degradated by the aerobic bacteria and the degree of the densification became lower along the direction of the atmospheric water descending, namely, the seriously degradated heavy oil and oil sand developed in the stratigraphic overlap belt along the basin margin, moderately degradated heavy oil developed in the fault barriered oil accumulation belt,while the lightly degradated heavy oil and normal oil occurred in structural-lithologic oil accumulation belt.The oil sand mines in Tumuji and Well Lai D6 showed more prospects to the exploration in the West Slope. |
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| Keywords: | Oil source Lateral migration Accumulative conditions Heavy oil The West Slope The Songliao Basin |
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