油气地质

柴达木盆地北缘西段古近纪以来沉积模式研究

  • 赵小龙 ,
  • 刘向君 ,
  • 梁利喜 ,
  • 杨超 ,
  • 陈春宇 ,
  • 刘道杰
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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.中国石油青海油田分公司勘探开发研究院,甘肃敦煌736202
孙国强(1977-),男,博士,主要从事含油气盆地石油地质学及沉积储层学方面的科研与教学工作。地址:(730000)甘肃省兰州 市东岗西路382 号中国科学院地质与地球物理研究所兰州油气资源研究中心。E-mail:sguoqiang@lzb.ac.cn

网络出版日期: 2012-08-20

基金资助

国家重点基础研究发展规划“973”项目“中国西部叠合盆地深部有效碎屑岩储层成因机制与发育模式”(编号:2011CB201104)和 中国科学院油气资源研究重点实验室开放基金“咸化湖盆深部优质碎屑岩储层形成机理研究”(编号:KFJJ2012-05)联合资助

Sedimentary model since Paleogene in northern margin of Qaidam Basin

  • ZHAO Xiaolong ,
  • LIU Xiangjun ,
  • LIANG Lixi ,
  • YANG Chao ,
  • CHEN Chunyu ,
  • LIU Daojie
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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 School of Chinese Academy of Sciences, Beijing 100049, China; 3. Research Institute of Exploration and Development, PetroChina Qinghai Oilfield
    Company, Dunhuang 736202, China

Online published: 2012-08-20

摘要

通过对柴达木盆地北缘(简称“柴北缘”)西段古近系和新近系的沉积序列、岩心特征、薄片特征、测 井资料及录井资料的分析,结合野外露头考察,对该区的沉积模式进行了系统研究。结果表明:古近系和 新近系发育以砾岩、砂岩和泥岩为主的碎屑岩沉积,且沉积体系以辫状河—辫状河三角洲平原—辫状河 三角洲前缘—滨浅湖沉积为主;古近系的岩性变化较大,主要为砾岩,具有正旋回特征,说明古近纪时期 为一水进过程;新近系地层发育以粗碎屑岩和细碎屑岩不等厚为主的交互沉积,水动力条件变化频繁。通 过进一步的研究认为,古近纪以后的柴北缘由于降水量(或气候)的周期性变化,形成了湖盆周缘粗碎屑 岩和细碎屑岩不等厚交互沉积,即在盆地边缘有泥岩发育,并且在靠近盆地的沉积中心也有中—细砂岩 的发育,这种粗碎屑岩和细碎屑岩的交互沉积层容易形成较好的储盖组合,有利于构造-岩性油气藏的形 成。沉积模式研究清楚地展示了柴北缘地区古近纪以来的沉积演化规律,为该区下一步的油气勘探提供 了可靠的地质依据。

本文引用格式

赵小龙 , 刘向君 , 梁利喜 , 杨超 , 陈春宇 , 刘道杰 . 柴达木盆地北缘西段古近纪以来沉积模式研究[J]. 岩性油气藏, 2012 , 24(4) : 13 -18 . DOI: 10.3969/j.issn.1673-8926.2012.04.003

Abstract

Based on core observation, cast thin section, well logging data and analysis of sedimentary sequence of the Paleogene and Neogene in the northern margin of Qaidam Basin, Combined with field observations, we studied the sedimentary model in this area. The result shows that clastic rocks are developed in Paleogene and Neogene in the northern margin of Qaidam Basin, such as conglomerate, sandstone and mudstone, and the sedimentary facies are mainly of braided river, braided river delta plain, braided river delta front and shore shallow lacustrine depositional systems. Conglomerate of Paleogene has the characteristic of upright cycle, so it is a water immersion process, and in Neogene it mainly develops alternating deposits of megaclast and fine grained detrital rocks which show frequent hydrodynamic conditions change. Due tothe cyclical changes in precipitation, mudstone developed in megaclast deposit area at the basin margin, and middle-fine sandstone also exsited in the mudstone deposit area at the basin sedimentary centre. This alternatingdeposits ofmegaclast and fine grained detrital rocks can formperfect reservoir-cap combination, and it is favorable for the formation of structural-lithologic reservoir. The sedimentary model shows the process of sedimentary evolution since the Paleogene clearly, which can provide reliable geological evidence for the further oil exploration.

参考文献

[1] 孙国强,赵明君,郭建明,等.昆特依凹陷中生界、新生界发育特征及构造演化分析[J].天然气地球科学,2011,22(1):102-107.
[2] 张景廉,石兰亭,陈启林,等.柴达木盆地地壳深部构造特征及油气勘探新领域[J].岩性油气藏,2008,20(2):29-36.
[3] 刘琪,李凤杰,郑荣才,等.柴达木盆地北缘西段新近系上干柴沟组高分辨率层序地层学研究[J].岩性油气藏,2010,22(1):65-69.
[4] 张正刚,袁剑英,阎存凤,等.柴北缘地区冷湖3—5 号构造带成藏控制因素分析[J].岩性油气藏,2009,21(2):42-44.
[5] 刘伟,闫林,顾家裕,等.柴达木盆地西部古近系与新近系的地震相[J].天然气工业,2008,28(5):35-37.
[6] 杨永剑,刘家铎,孟万斌,等.柴达木盆地北缘潜西地区古近系储层发育特征及主控因素[J].岩性油气藏,2010,22(增刊):60-65.
[7] 孟万斌,李敏,刘家铎,等.柴达木盆地北缘潜西地区路乐河组末端扇沉积体系分析[J].岩性油气藏,2010,22(4):37-42.
[8] 刘殿鹤,李凤杰,郑荣才,等.柴北缘西段古近系下干柴沟组沉积相特征分析[J].天然气地球科学,2009,20(6):847-853.
[9] 蒋斌,李凤杰,郑荣才,等.柴达木盆地北缘西段古近系路乐河组沉积相特征研究[J].岩性油气藏,2010,22(1):48-52.
[10] 王鹏,赵澄林.柴达木盆地北缘地区第三系碎屑岩储层沉积相特征[J].石油大学学报:自然科学版,2001,25(1):12-16.
[11] 孙国强,谢梅,张永庶,等.柴北缘马北地区下干柴沟组下段沉积特征及演化[J].岩性油气藏,2011,23(6):56-61.
[12] 曹国强,陈世悦,徐凤银,等.柴达木盆地西部中———新生代沉积构造演化[J].中国地质,2005,32(1):33-40.
[13] 惠博,伊海生,夏国清,等.柴达木盆地西部新生代沉积演化特征[J].中国地质,2011,38(5):1274-1281.
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