鄂尔多斯盆地西缘奥陶系拉什仲组深水水道沉积类型及演化

李华; 何幼斌; 冯斌; 郝烃; 苏帅亦; 张灿; 王季欣

doi:10.3799/dqkx.2018.568

Volume 43 Issue 6

Jun. 2018

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Article Navigation > Earth Science > 2018 > 43(6): 2149-2159

Li Hua, He Youbin, Feng Bin, Hao Ting, Su Shuaiyi, Zhang Can, Wang Jixin, 2018. Type and Evolution of Deep-Water Channel Deposits of Ordovician Lashizhong Formation in Western Margin of Ordos Basin. Earth Science, 43(6): 2149-2159. doi: 10.3799/dqkx.2018.568

Citation:

Li Hua, He Youbin, Feng Bin, Hao Ting, Su Shuaiyi, Zhang Can, Wang Jixin, 2018. Type and Evolution of Deep-Water Channel Deposits of Ordovician Lashizhong Formation in Western Margin of Ordos Basin. Earth Science, 43(6): 2149-2159. doi: 10.3799/dqkx.2018.568

Citation:

Li Hua, He Youbin, Feng Bin, Hao Ting, Su Shuaiyi, Zhang Can, Wang Jixin, 2018. Type and Evolution of Deep-Water Channel Deposits of Ordovician Lashizhong Formation in Western Margin of Ordos Basin. Earth Science, 43(6): 2149-2159. doi: 10.3799/dqkx.2018.568

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Type and Evolution of Deep-Water Channel Deposits of Ordovician Lashizhong Formation in Western Margin of Ordos Basin

doi: 10.3799/dqkx.2018.568

Li Hua^{1,2,3
,},
He Youbin^{1,2,3
,
,},
Feng Bin¹,
Hao Ting¹,
Su Shuaiyi¹,
Zhang Can¹,
Wang Jixin¹

1.
School of Geosciences, Yangtze University, Wuhan 430100, China
2.
Research Center of Sedimentary Basin, Yangtze University, Wuhan 430100, China
3.
Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan 430100, China

Received Date: 2017-12-11
Publish Date: 2018-06-15

Abstract

Abstract

The deep-water channel sedimentary type is one of important sedimentary types in the deep-water zone. Research on the mechanism of deep-water channel not only can improve acquaintance of deep-water deposits, but also is helpful to oil and gas exploration. Mechanism of the deep-water channel of the Ordovician Lashizhong Formation in western margin of the Ordos basin was detailedly worked based on outcrop. The lithology of Lashizhong Formation consists of greyish-green mudstone and sandstone and few siltstone and conglomeration with flute cast, cross bedding, graded bedding and deformation structure, which suggests deep-water environment. Gravity flow deposits are well developed. The deep-water channel deposits are also typical. It is found in this study that the deep-water channel deposits could be divided into confined and non-confined channels, based on the morphology, structure, and sedimentary style. The former includes complex and vertical aggradation channel deposits. The latter can be subdivided into migrational channel and isolated small channel deposits. The lithology of complex channel deposits is coarse sandstone and conglomeration in the bottom, containing channel axis deposit, secondary channel and channel-levee system deposits, with 7.5 m in width, which could be divided into developmental, mature and decline phases. The vertical aggradation channel deposits are bedded medium and fine sandstone, with 12.4 m in width, 1.3 m in thickness, and the width-to-thickness ratio of 9.54. The migrational channel is medium to fine sandstone with northwestward migration. The width is 6.9-12.3 m, the thickness is 0.23-0.73 m, and width-to-thickness ratios range from 14.11-53.48. The isolated small channel deposits consist of fine sandstone and siltstone, lenticular shaped, small scale with 0.5-0.6 m in width, 0.15-0.25 m in thickness, and the width-to-thickness ratios of 2.4-3.33. The complex and vertical aggradation channel deposits develop when gravity flow outbreaks. Its energy is usually high with strong erosive power. The migrational channel deposits develop when gravity flow is in middle to later phases when their energy is damped. And the isolated small channel deposits develop during last phase of gravity flow. Its energy further decreases. In the spatial position, the complex and vertical channel deposits usually develop in the middle-upper part of slope. Migrational channel deposits form in the middle-lower slope, and isolated small channel deposits commonly grow in toe of slope and deep-water basin.
- channel,
- turbidity current,
- Lashizhong Formation,
- Ordovician,
- Ordos basin,
- petroleum geology

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Type and Evolution of Deep-Water Channel Deposits of Ordovician Lashizhong Formation in Western Margin of Ordos Basin

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