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| 柴达木盆地西北缘现代冲积扇沉积特征及石油地质意义 | |
| 引用本文： | 王勇,钟建华,王志坤,段宏亮,连承波.柴达木盆地西北缘现代冲积扇沉积特征及石油地质意义[J].地质论评,2007,53(6):791-796. |
| 作者姓名： | 王勇 钟建华 王志坤 段宏亮 连承波 |
| 作者单位： | 1. 中国科学院广州地球化学研究所,广州,510640;中国科学院研究生院,北京,100039 2. 中国科学院广州地球化学研究所,广州,510640;中国石油大学(华东)地球资源与信息学院,山东,东营,257061 3. 中国石油大学(华东)地球资源与信息学院,山东,东营,257061 |
| 基金项目： | 本文为国家自然科学基金（编号405003003）资助项目的成果。 |
| 摘 要： | 柴达木盆地处于古亚洲构造域和特提斯－喜马拉雅构造域的结合部，构造应力大而复杂，导致盆内地势起伏大，加上西南暖湿气流受喜马拉雅山系阻隔难以进入境内，盆内气候干旱，最终导致盆地内冲积扇极为发育。通过对大柴旦地区大头羊煤矿、鱼卡河、波门河和八里沟四个冲积扇的实地考察，共观测到3个亚相8个微相：扇根亚相沉积物最粗，分为古沟道、主水道和主水道间微相；扇中亚相沉积物偏细，成熟度增高，分为辫状水道、辫状水道间和纵坝微相；扇缘亚相沉积物最细，流体能量最低，分为水道径流和片流微相。不同沉积微相其沉积特征差异较大，认为古沟道、主水道和辫状水道微相具有较好的储集性能。勘探表明，冲积扇沉积与储层有着密切的关系，其内形成的油藏具有“自我保护”的能力；另外，冲积扇的形成很可能导致上覆地层形成扇背斜油藏，也可能导致下伏基岩形成基岩风化壳油藏。 |
| 关 键 词： | 冲积扇 微相 储层 风化壳油藏 |
| 收稿时间： | 2007/6/12 0:00:00 |
| 修稿时间： | 2007-06-122007-08-30 |
Sedimentary Characteristics of Modern Alluvial Fans in the Northwest Margin of the Qaidam Basin and Their Significance in Petroleum Geology |
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| WANG Yong,ZHONG Jianhua,WANG Zhikun,DUAN Hongliang,LIAN Chengbo.Sedimentary Characteristics of Modern Alluvial Fans in the Northwest Margin of the Qaidam Basin and Their Significance in Petroleum Geology[J].Geological Review,2007,53(6):791-796. | |
| Authors: | WANG Yong ZHONG Jianhua WANG Zhikun DUAN Hongliang LIAN Chengbo |
| Institution: | 1. Guangzhou Institute of Geochermistry, Chinese Academy of Sciences, Guangzhou, 510640; 2. Graduate School of Chinese Academy of Sciences, Beijing, 100039; 3. Institute of Earth Resources and Information, University of Petroleum (East China |
| Abstract: | The Qaidam basin is located in the superposition area of Pal-Asia tectonic domain and Tethyan Himalayan tectonic domain. Complex tectonic stress results in the great relief in the basin. Southwest warm moist current hindered by Himalayan Mountains caused the climate arid. The alluvial fans were well developed under the special geological background. Four alluvial fans in the Da Qaidam area were investigated, including three subfacies and eight microfacies. According to the depositional environment and sediment characteristics, alluvial fan facies was subdivided into upper fan, middle fan and lower fan subfacies. The upper fan subfacies is composed of coarse sediments, and could be subdivided into channel, main canal and space between canal microfacies. The middle fan subfacies is composed mainly of fine grained sediments of high maturaty and could be subdivided into braided channel, space between channel and vertical-bar microfacies. The lower fan subfacies is composed of the finest grained sediments among the three subfaces with the lowest fluid energy, and could be further subdivided into radial water channel and laminar flow microfaces. There is a great discrepancy of sediments among different kinds of subfacies. The channel, main canal and braided channel microfaces have good reservoir properties. It is proved by exploration that oil pools with self-protection ability could be formed in the Internal of alluvial fan facies; Fan anticline Reservoir above the iacent stratum and base rock weathering crust Reservoir could be formed with alluvial fans formation. |
| Keywords: | Alluvial fans Microfacies Reservoir Weathering crust reservior |
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