Sedimentary Features and Facies of&nbsp; Paleogene Braided River in Mabei Area

WU Zhi-xiong, SHI Ji-an, ZHANG Yong-shu, ZOU Kai-zhen, WANG Mu, WANG Da-cheng, SUN Guo-qiang

doi:10.11764/j.issn.1672-1926.2012.05.849

Natural Gas Geoscience >

2012 , Vol. 23 >Issue 5: 849 - 855

DOI: https://doi.org/10.11764/j.issn.1672-1926.2012.05.849

Sedimentary Features and Facies of Paleogene Braided River in Mabei Area

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1.Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences, Lanzhou 730000,China；
2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China；
3.Exploratory Development Institute of PetroChina Qinghai Oilfield Company, Dunhuang 736202, China;
4.Training Center of Gansu Provincial Science and Technology Department, Lanzhou 730030, China

Received date: 2012-03-27

Revised date: 2012-08-15

Online published: 2012-10-10

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Abstract

Based on outcrop observation,core description,well logging and analysis assay data,the sedimentary features and sequence of lower Ganchaigou Formation in Mabei area, western segment of northern margin of Qaidam basin is analyzed.The results indicate that it develops braided deposition.And a detailed description of the sedimentary microfacies characteristic of braided deposit is given.Conglomerates,sandstones,mudstones are the main lithology type,and the percentage of conglomerates is low.And it is a normal grading change from coarse to thin.Based on this conclusion,sedimentary features and sequence of braided river are established.With the deep research on sedimentary sequence and the physical properties characteristics,the sedimentary microfacies are the main controlling factors of reservoir.

Key words： Sedimentary characteristics;Braided river;Lower Ganchaigou Formation; Qaidam basin

Cite this article

WU Zhi-xiong, SHI Ji-an, ZHANG Yong-shu, ZOU Kai-zhen, WANG Mu, WANG Da-cheng, SUN Guo-qiang . Sedimentary Features and Facies of Paleogene Braided River in Mabei Area[J]. Natural Gas Geoscience, 2012 , 23(5) : 849 -855 . DOI: 10.11764/j.issn.1672-1926.2012.05.849

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