| Composite Sand Bodies Architecture of Deep-Water Turbidite Channels in the Niger Delta Basin |
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| 作者姓名： | LIN Yu WU Shenghe WANG Xing LING Yun LU Yao ZHANG Jiajia and YU Zhi |
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| 作者单位： | 1 College of Geosciences, China University of Petroleum, Beijing 102249, China；2 Research Institute, China National Offshore Oil Corp, Beijing 100027, China；3 BGP Inc., China National Petroleum Corporation, Zhuozhou 072750, Hebei, China |
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| 基金项目： | This work is granted by the National Science and Technology Major Project of the Ministry of Science and Technology of China (Grant No.2011ZX05030-005 and No.2011ZX05009-003) and the National Natural Science Foundation of China (Grant No. 40902035). |
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| 摘 要： | Abstract: Deep-water turbidite channels have attracted much attention as a focused issue in petroleum exploration and development. Extensive studies have been performed on the architecture of turbidite channels, and most researches have focused on their geometric shapes, sedimentary processes and controlling factors. However, little attention has been paid to the distribution patterns, distribution laws and quantitative studies of composite sand bodies of turbidite channels. Taken one slope area of the Niger Delta Basin as an example, this study conducted a semi-quantitative to quantitative analysis on architecture of composite sand bodies of turbidite channels based on cores, well logging and seismic surveys. It is shown that turbidite channel systems can be classified as confined and unconfined channel systems. For confined channel systems, the vertical evolution process involves four stages. The sinuosity of a channel system is controlled by slope, with a negative power function relationship between them. When slope gradient reaches four degrees, the channel system is nearly straight. Based on the migration direction and migration amount of single channels within channel complexes, channel composite patterns can be divided into four classes (the lateral composite, en-echelon composite, swing composite and vertical composite) and several subclasses. Various channel composite patterns show specific distribution laws spatially. For meandering channel complexes at the middle-late evolution stage of confined channel systems, the lateral migration amongst single channels shows the features of integrity and succession. The sinuosity of single channels in the late period is greater than that in the early period, and cut-offs may occur locally when the sinuosity is larger than five degrees. This study provides a better understanding for the geological theory of deep-water sedimentary, and also improves exploitation benefits of this type of reservoirs.
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| 关 键 词： | Key words: turbidite channels composite sand bodies architecture Niger Delta Basin quantitative relations |
| 收稿时间： | 2014/1/10 0:00:00 |
| 修稿时间： | 2014/6/12 0:00:00 |
Composite Sand Bodies Architecture of Deep-Water Turbidite Channels in the Niger Delta Basin |
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| Authors: | LIN Yu WU Shenghe WANG Xing LING Yun LU Yao ZHANG Jiajia YU Zhi |
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| Abstract: | Deep-water turbidite channels have attracted much attention as a focused issue in petroleum exploration and development. Extensive studies have been performed on the architecture of turbidite channels, and most researches have focused on their geometric shapes, sedimentary processes and controlling factors. However, little attention has been paid to the distribution patterns, distribution laws and quantitative studies of composite sand bodies of turbidite channels. Taken one slope area of the Niger Delta Basin as an example, this study conducted a semi-quantitative to quantitative analysis on architecture of composite sand bodies of turbidite channels based on cores, well logging and seismic surveys. It is shown that turbidite channel systems can be classified as confined and unconfined channel systems. For confined channel systems, the vertical evolution process involves four stages. The sinuosity of a channel system is controlled by slope, with a negative power function relationship between them. When slope gradient reaches four degrees, the channel system is nearly straight. Based on the migration direction and migration amount of single channels within channel complexes, channel composite patterns can be divided into four classes(the lateral composite, en-echelon composite, swing composite and vertical composite) and several subclasses. Various channel composite patterns show specific distribution laws spatially. For meandering channel complexes at the middle-late evolution stage of confined channel systems, the lateral migration amongst single channels shows the features of integrity and succession. The sinuosity of single channels in the late period is greater than that in the early period, and cut-offs may occur locally when the sinuosity is larger than five degrees. This study provides a better understanding for the geological theory of deep-water sedimentary, and also improves exploitation benefits of this type of reservoirs. |
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| Keywords: | turbidite channels composite sand bodies architecture Niger Delta Basin quantitative relations |
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