古陆架砂脊沉积特征及其石油地质意义: 以塔里木盆地志留系柯坪塔格组下段为例

杨帅; 刘晓峰; 陆永潮; 杨素举

doi:10.3799/dqkx.2014.080

Volume 39 Issue 7

Jul. 2014

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Article Navigation > Earth Science > 2014 > 39(7): 858-870

Yang Shuai, Liu Xiaofeng, Lu Yongchao, Yang Suju, 2014. Sedimentary Characteristics and Petroleum Geological Significance of Ancient Shelf Sand Ridges: A Case Study of Lower Member of Silurian Kepingtage Formation in Tarim Basin. Earth Science, 39(7): 858-870. doi: 10.3799/dqkx.2014.080

Citation:

Yang Shuai, Liu Xiaofeng, Lu Yongchao, Yang Suju, 2014. Sedimentary Characteristics and Petroleum Geological Significance of Ancient Shelf Sand Ridges: A Case Study of Lower Member of Silurian Kepingtage Formation in Tarim Basin. Earth Science, 39(7): 858-870. doi: 10.3799/dqkx.2014.080

Citation:

Yang Shuai, Liu Xiaofeng, Lu Yongchao, Yang Suju, 2014. Sedimentary Characteristics and Petroleum Geological Significance of Ancient Shelf Sand Ridges: A Case Study of Lower Member of Silurian Kepingtage Formation in Tarim Basin. Earth Science, 39(7): 858-870. doi: 10.3799/dqkx.2014.080

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Sedimentary Characteristics and Petroleum Geological Significance of Ancient Shelf Sand Ridges: A Case Study of Lower Member of Silurian Kepingtage Formation in Tarim Basin

doi: 10.3799/dqkx.2014.080

Yang Shuai^{1, 2
,},
Liu Xiaofeng^{1, 2
,
,},
Lu Yongchao^{1, 2},
Yang Suju³

1.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
3.
Exploration and Production Research Institute, SINOPEC Northwest Oilfield Branch Company, Urumchi 830011, China

Received Date: 2014-01-15
Publish Date: 2014-07-15

Abstract

Abstract

Ancient shelf sand ridge deposited in Lower member of Silurian Kepingtage Formation of Shuntuoguole uplift, Tarim basin, provides an ideal example to understand its sedimentary formation characteristics. By using well-logging and core data, shelf sand ridge is divided into 6 lithofacies: massive bedding medium-fine sandstone (FA1), hummocky cross bedding medium-fine sandstone (FA2), muddy conglomerate-bearing medium-fine sandstone (FA3), clay layer-bearing bimodal cross bedding fine sandstone (FA4), tidal bedding fine sandstone interbedded with mudstone (FA5), horizontal bedding shelf mudstone (FA6) according to the lithology and sedimentary structure of sediments. In terms of lithofacies association characteristics, shelf sand ridge whose deposits are affected by shelf tide and storm wave is classified into 4 sedimentary microfacies: sand ridge core microfacies (FA1-FA2-FA3), sand ridge inner margin microfacies (FA4), sand ridge external margin (FA5) and shelf mud microfacies (FA6). The plane distribution characteristics of shelf sand ridge along NE-SW and NW-SE are determined through detailed analysis of three-dimensional seismic slice attributes calibrated with well data. Ancient shelf sand ridge reservoir has characteristics of extra low porosity and permeability, in which sand ridge core microfacies is better reservoir with average porosity 6.96%, average permeability 0.34×10^-3 μm², and is mainly industrial oil flow concentrated area. Syndepositional slightly anticline-lithologic traps are often formed since sandstones of shelf sand ridge present ridge or mound shape and draped by thick-layer shelf mudstone.
- ancient shelf sand ridge,
- lithofacies,
- microfacies,
- Kepingtage Formation,
- petroleum geology,
- Tarim basin

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References(43)

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