柴达木盆地北缘马北地区古近系辫状河微相特征及沉积模式

吴志雄，史基安，张永庶，邹开真，王牧，王大成，孙国强

doi:10.11764/j.issn.1672-1926.2012.05.849

天然气地球科学 >

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

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

天然气地质学

柴达木盆地北缘马北地区古近系辫状河微相特征及沉积模式

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1.中国科学院油气资源研究重点实验室，甘肃兰州 730000；2.中国科学院研究生院，北京 100049；
3.中国石油青海油田勘探开发研究院，甘肃敦煌 736202；4.甘肃省科学技术厅培训中心，甘肃兰州 730030

吴志雄(1984-)，男,四川三台人，博士研究生，主要从事储层地质学研究.E-mail:wzx19842003@163.com.

收稿日期: 2012-03-27

修回日期: 2012-08-15

网络出版日期: 2012-10-10

基金资助

中国科学院油气资源研究重点实验室开放基金（编号:KFJJ2012-05）资助.

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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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摘要

通过岩心观察、薄片分析，结合测井和录井资料及粒度分析等化验资料，对柴达木盆地北缘马北地区古近系下干柴沟组下段砂砾岩的沉积环境和沉积序列进行了深入研究，认为该区古近系主要为辫状河沉积，并详细讨论了研究区辫状河各微相特征。研究区古近系岩性主要以砾岩、砂岩和泥岩沉积为主，砾岩所占比例不高，具有正旋回沉积序列特征。根据辫状河沉积环境特征和沉积序列建立了研究区辫状河沉积模式。通过对研究区储层物性和沉积微相的关系分析，认为沉积微相为研究区储层的主控因素。
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关键词： 沉积特征; 辫状河; 下干柴沟组; 柴达木盆地

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吴志雄，史基安，张永庶，邹开真，王牧，王大成，孙国强 . 柴达木盆地北缘马北地区古近系辫状河微相特征及沉积模式[J]. 天然气地球科学, 2012 , 23(5) : 849 -855 . DOI: 10.11764/j.issn.1672-1926.2012.05.849

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

参考文献

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