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| 湖缘峡谷及其含油性 | |
| 引用本文： | 姜在兴,杨伟利,于雯泉,王卫红,李守军,李丕龙,张善文.湖缘峡谷及其含油性[J].地学前缘,2005,12(3):186-194. |
| 作者姓名： | 姜在兴 杨伟利 于雯泉 王卫红 李守军 李丕龙 张善文 |
| 作者单位： | 1. 中国地质大学(北京)能源学院,北京,100083 2. 中国科学院,广州地球化学研究所,广东,广州,510640 3. 中国科学院,青岛海洋研究所,山东,青岛,266071 4. 中国石油大学(华东)山东,东营,257061 5. 胜利石油管理局,山东,东营,257060 |
| 基金项目： | 国家重点基础研究发展计划(973计划);国家科技攻关项目 |
| 摘 要： | 在陆相断陷湖盆陡坡带,控盆断裂的剧烈活动导致在相对较短时期内形成盆地的快速沉降,与湖盆边缘地形形成巨大高差。沿此边缘,经过早期阵发性洪水及河流的强烈下蚀,并不断向源侵蚀,在古断面上形成宽达数km,深达上km的深切谷,称之为湖缘峡谷。东营凹陷北部陡坡带的Y921峡谷即为湖缘峡谷,其现今形态为长7000m、宽3500m、深3500m、剖面呈“U”型的特征。古构造及古生物分析认为,在古新世至渐新世时期,陈南断层剧烈活动,使断层两侧形成较大的高差,在干旱、阵发性洪水侵蚀下逐渐形成Y921峡谷,并在其底部形成侵蚀面。孢粉分析认为,仅沙四上段沉积时期就有近1000m的高差。后期,随湖平面上升,峡谷逐渐充填了古近系沙河街组四段、三段和部分二段地层,主要为辫状河粗碎屑砂砾岩、扇三角洲相交错层理砂岩和滨浅湖相泥岩、粉砂岩。这种峡谷的特点是短、宽、深,其充填模式主要为辫状河-扇三角洲-湖泊相沉积体系。由于峡谷前缘为深湖相泥岩作为生油岩,陈南断层和峡谷内的冲刷面作为油气运移通道,峡谷内砂砾岩作为储层,因此在峡谷内形成了多种非构造油气藏类型。 |
| 关 键 词： | 湖缘峡谷 断陷湖盆 陡坡带 控盆断层 洪水侵蚀 含油性 |
| 文章编号： | 1005-2321（2005）03-0186-09 |
| 收稿时间： | 2005-05-24 |
| 修稿时间： | 2005-06-17 |
The lake-margin canyon and its hydrocarbon potential |
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| JIANG Zai-xing,YANG Wei-li,YU Wen-quan,WANG Wei-hong,LI Shou-jun,LI Pi-long,ZHANG Shan-wen.The lake-margin canyon and its hydrocarbon potential[J].Earth Science Frontiers,2005,12(3):186-194. | |
| Authors: | JIANG Zai-xing YANG Wei-li YU Wen-quan WANG Wei-hong LI Shou-jun LI Pi-long ZHANG Shan-wen |
| Institution: | 1. School of Energy Resources. China University of Geosciences. Beijing 100083, China; 2. Guangzhou Institute of Geochemistry. Chinese Academy of Sciences, Guangzhou 510640, China; 3. Qingdao Institute of Oceanology , Chinese Academy of Sciences, Qingdao 266071. China;4. China University of Petroleum( Huadong |
| Abstract: | In a half-graben, the early-stage movement of the basin-controlling fault results in a great height difference along the lake margin. In an arid to semi-arid climate condition, spasmodic floods intensively eroded the fault's footwall basement so that an elongate incised valley, called the lake-margin canyon, is formed . The Y921 canyon in the northern steep slope of Dongying depression is such a canyon. In plane view, the 7 000-meter-long Y921 canyon cuts into the northern Chenjiazhuang footwall uplift and terminates at the Chennan fault in the south. In vertical profiles it is incised as deeply as 1 350 meters into the uplifted granite-gneiss footwall and has a “U”-shaped cross-section. The Y921 canyon is filled with conglomerate, arkose, lithic sandstone, mudstone, and carbonaceous shale of the Tertiary Shahejie Formation. The canyon was filled with braided river coarse-grained clastics, followed by cross-stratified sandstones of fan delta facies, and finally with shore-shallow-lake siltstone and mudstone.The paleotectonic analysis reveals that the Chennan fault's movement formed a large elevational difference, which led to incisement of the Y921 canyon. As the Dongying lake level rose with respect to the canyon bottom, the canyon filled until the differential elevation ceased. Black mudstones in the front of the lake margin canyon served as source rocks, and clastic deposits in the canyon served as reservoirs. In addition,the Chennan fault and the bedrock floor of the filled canyon served as conduits for hydrocarbon migration. Accordingly, many types of non-structural traps can be formed in such canyons as Y921. |
| Keywords: | lake margin canyon fault basin steep slope basin-controlling fault flooding incision hydrocarbon potential |
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