柴达木盆地马仙地区下干柴沟组上段辫状河三角洲沉积特征

杜忠明，史基安，孙国强，季赟,吴志雄,唐相路

doi:10.11764/j.issn.1672-1926.2013.03.505

天然气地球科学 >

2013 , Vol. 24 >Issue 3: 505 - 511

DOI: https://doi.org/10.11764/j.issn.1672-1926.2013.03.505

天然气地质学

柴达木盆地马仙地区下干柴沟组上段辫状河三角洲沉积特征

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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.中国科学院大学，北京100049；3.中国石油青海油田公司勘探开发研究院,甘肃敦煌 736202

杜忠明(1986-)，男，山东滕州人，硕士研究生，主要从事沉积学和石油地质学研究.E-mail:duzhongming-dz@163.com.

收稿日期: 2012-09-18

修回日期: 2012-12-07

网络出版日期: 2013-06-10

基金资助

国家重点基础研究发展规划(“973”)项目(编号:2011CB201104)资助.

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The Sedimentary Characteristics of Braided Delta of the Upper Xiaganchaigou Formation in Maxian Region of Qaidam Basin

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1.Key Laboratory of Petroleum Resources Research，Institute of Geology and Geophysics，
Chinese Academy of Sciences，Lanzhou 730000，China; 
2.University of Chinese Academy of Sciences,Beijing 100049，China；
3．Research Institute of Exploration and Development,PetroChina Qinhai Oilfield Company,Dunhuang 736202,China

Received date: 2012-09-18

Revised date: 2012-12-07

Online published: 2013-06-10

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摘要

通过分析岩心、铸体薄片及测井等资料，可知柴达木盆地马仙地区下干柴沟组上段主要为含砾砂岩、砂岩、粉砂岩和泥岩构成的一套碎屑岩组合，发育板状(或槽状)交错层理，碎屑岩粒度粗，成分成熟度和结构成熟度中等，粒度概率曲线为3段式或2段式。研究认为下干柴沟组上段是较强水动力条件下牵引流沉积的产物，沉积环境属于辫状河三角洲。依据水动力特点和岩心相、测井相等相标志，可将其划分为2种亚相和5种微相:辫状河三角洲平原分流河道、分流河道间及辫状河三角洲前缘水下分流河道、水下分流河道间、河口坝。下干柴沟组上段辫状河三角洲沉积经历了1次湖侵—湖退的演化过程，各时期的沉积相展布特点略有不同，辫状河三角洲平原分流河道和辫状河三角洲前缘水下分流河道沉积在研究区内分布广泛，其砂体厚度大，具有广阔的油气勘探前景。

关键词： 柴达木盆地; 辫状河三角洲; 沉积特征; 马仙地区; 下干柴沟组

本文引用格式

杜忠明，史基安，孙国强，季赟,吴志雄,唐相路 . 柴达木盆地马仙地区下干柴沟组上段辫状河三角洲沉积特征[J]. 天然气地球科学, 2013 , 24(3) : 505 -511 . DOI: 10.11764/j.issn.1672-1926.2013.03.505

Abstract

Through the analyses of core，cast thin sections and well logging data，we found the Upper Xiaganchaigou Formation in Maxian region of Qaidam Basin is mainly a set of terrigenous clastics,including conglomeratic sandstones,sandstones,siltstones and mudstones,and it develops planar-trough cross bedding.The clastic rock has coarse grain,medium compositional maturity and textural maturity,and the grain-probability curve represents three-stage or two-stage.The authors consider it to be the product of tractive current under fairly strong hydrodynamic condition.Its sedimentary environment belongs to braided delta.According to the characteristics of hydrodynamic conditions,core and log facies,the authors identified 2 subfacies and 5 microfacies,which include braided delta distributary channel,braided delta interdistributary channel,braided delta subaqueous distributary channel,braided delta subaqueous interdistributary channel,and mouth bar.The Upper Xiaganchaigou Formation experienced a transgression-regression evolution,and the distribution of sedimentary facies is slightly different in each period.The braided delta distributary channel and braided delta subaqueous distributary channel widely distributed in the study area and its sandbody with great thickness has a broad exploration prospects.

Key words： Qaidam Basin; Braided delta; Sedimentary characteristics; Maxian region; Xiaganchaigou Formation

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