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现代地质 ›› 2005, Vol. 19 ›› Issue (Suppl): 64-69.

• 石油地质 • 上一篇    下一篇

柴达木盆地西部地区下干柴沟组下段沉积体系和物源分析

曹国强1,袁文芳2,彭德华3,徐凤银3,陈世悦2   

  1. 1中国科学院 广州地球化学研究所,广东 广州510640;
    2石油大学 地球资源与信息学院,山东 东营257061;
    3中国石油天然气集团公司 青海油田分公司,甘肃 敦煌736202
  • 收稿日期:2004-10-15 修回日期:2004-10-28 出版日期:2005-03-20 发布日期:2013-04-08
  • 作者简介:曹国强,男,高级工程师,博士研究生,1961年出生,地球物理学专业,主要从事地球物理勘探与研究的工作。

SEDIMENTARY SYSTEM AND SOURCE PROVENANCE ANALYSIS OF THE LOWER MEMBER OF LOWER GANCHAIGOU FORMATION IN WESTERN QAIDAM BASIN

CAO Guo-qiang1,YUAN Wen-fang2, PENG De-hua3, XU Feng-yin3, CHEN Shi-yue2   

  1. 1Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,Guangdong510640,China;
    2University of Petroleum,Dongying,Shandong257061,China;
    3Qinghai Oilfield Company,PetroChina,Dunhuang,Gansu736202,China
  • Received:2004-10-15 Revised:2004-10-28 Online:2005-03-20 Published:2013-04-08

摘要:

通过对沉积环境、重矿物组合及重矿物稳定系数的研究发现,柴达木盆地西部地区下干柴沟组下段沉积期研究区有5个物源方向:(1)阿尔金斜坡北侧的阿卡腾能山方向;(2)小梁山-牛鼻子梁北侧的大通山南山-安南坝-阿尔金山方向;(3)祁漫塔格山西段跃进方向;(4)祁漫塔格山东段东柴山-黄石方向;(5)受阿尔金山和祁漫塔格山共同控制的阿拉尔方向。不同的物源区控制着沉积体系的发展,根据研究区的物源分析,划分出4大沉积体系:(1)阿尔金山西段冲积扇-扇三角洲-湖底扇-深湖沉积体系;(2)阿尔金山中段冲积扇-辫状河流-三角洲-滨浅湖沉积体系;(3)祁漫塔格山前冲积扇-河流-三角洲-滨浅湖沉积体系;(4)古阿拉尔河-三角洲-滨浅湖沉积体系。并据沉积体系分的分布与油气聚集规律的发现,扇三角洲和三角洲的水下分流河道、河口坝砂体、滨浅湖滩坝砂体以及湖底扇中扇辫状沟道砂体,具有良好的油气生储盖组合,成为柴西地区下干柴沟组下段的有利的勘探目标。

关键词: 柴西地区, 下干柴沟组下段, 沉积体系, 物源分析, 重矿物组合, 稳定系数

Abstract:

Based on studies of depositional environment, assemblage of heavy mineral and stability factor of heavy mineral of the lower member of lower Ganchaigou Formation in the western Qaidam Basin, there are 5 source directions:(1)Akatengneng Mountain direction in the north of the Altun slope;(2)southern Datongshan -Annanba-Altun Mountain direction in the north of Xiaoliangshan-Niubiziliang;(3)Yuejin direction in the west of Qimantage Moumtain;(4)Dongchaishan-Huangshi direction in the east of Qimantage Moumtain;(5)Alar direction between Altun Mountain and Qimantage Moumtain. Different source areas control the development of sedimentary systems.There are 4 sedimentary systems in western Qaidam Basin:(1)the alluvial fan-delta fan-sublacustrine fan-deep lake sedimentary system in the west of Altun Mountain;(2)the alluvial fan-braided river-delta-littoral lake sedimentary system in the middle of Altun Mountain;(3)the alluvial fan-river-delta-littoral lake sedimentary system in front of Qimantage Moumtain;(4)the ancient Alar river-delta-littoral lake sedimentary system. According to the theory of sedimentary system distribution and oil and gas accumulation, fan delta, delta,beach bar and sub-lacustrine fan have good oilgenerating strata and reservoirs,where are the most prospective areas for exploration.

Key words: the western Qaidam Basin, lower member of lower Ganchaigou Formation, sedimentary system, source provenance analysis, assemblage of heavy mineral, stability factor

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