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现代地质 ›› 2013, Vol. 27 ›› Issue (4): 915-924.

• 石油地质学 • 上一篇    下一篇

北部湾盆地涠西南凹陷涠11区流一段扇三角洲沉积特征及控制因素

李茂1, 2 ,李胜利3,姜平1, 2,于兴河3,曾小明2,3,戴明建3   

  1. (1.中国地质大学 资源学院,湖北 武汉430074;2.中海石油(中国)有限公司 湛江分公司,广东 湛江524057; 3.中国地质大学 能源学院,北京100083)
  • 出版日期:2013-08-10 发布日期:2013-08-07
  • 通讯作者: 李胜利,男,副教授,博士,1971年出生,矿产普查与勘探专业,主要从事储层地质学研究。
  • 作者简介:李茂,男,博士研究生,1971年出生,油气田开发工程专业,主要从事海洋石油勘探开发地质研究。 Email:lim@cnooc.com.cn。
  • 基金资助:
    国家自然科学基金项目(41272132);国家“十二五”油气重大专项(2011ZX05023001-009)。

Sedimentary Characteristics of Fan Deltas and the Dominated Factors in W11 Area of 1st Member of Liushagang Formation in Weixinan Depression, Beibuwan Basin

LI Mao1,2, LI Sheng-li3, JIANG Ping1,2, YU Xing-he3, ZENG Xiao-ming2,3, DAI Ming-jian3   

  1. (1.Faculty of Earth Resources, China University of Geosciences,Wuhan, Hubei430074, China;2.Zhanjiang Branch, CNOOC Ltd., Zhanjiang, Guangdong524057, China;3.School of Energy Resources, China University of Geosciences, Beijing100083, China)
  • Online:2013-08-10 Published:2013-08-07

摘要: 北部湾盆地涠洲11区流一段发育缓坡型和陡坡型两种类型的扇三角洲。结合岩电震资料,分析了这两类扇三角洲的异同,并探讨了造成这两类扇三角洲沉积特征异同的主控因素。其中陡坡型扇三角洲主要分布于研究区北部陡坡带的流一段中亚段,粒度较粗,以重力流成因的厚层砂砾岩体为主,沉积厚度大,平面展布小;而缓坡型扇三角洲主要分布于研究区南部的涠西南低凸起缓坡带附近的流一段下亚段,粒度相对偏细,牵引流与重力流沉积构造均较发育,沉积厚度相对较小,平面延伸范围广。两类扇三角洲形成与分布特征的不同主要受控于构造格局、古地形的差异以及基准面变化等。

关键词: 涠西南凹陷, 流一段, 缓坡型扇三角洲, 陡坡型扇三角洲, 沉积特征

Abstract: Fan deltas of the abrupt slope and the gentle slope areas, were developed in the W11 area of 1st Member of the Liushagang Formation in Southwestern Weizhou Depression, Beibuwan Basin. Based on the lithology, logging and seismic data, the different characteristics between these two kinds of fan deltas were analyzed and the main controlling factors of the fan delta were discussed. The fan deltas at abrupt slope area, which were mainly distributed at the steep slope zone of the middle part of 1st Member of the Liushagang Formation in the northern of the study area, were comparatively coarse grain-sized and were mainly thick-layer sandstone rock deposited from the gravity flow, with large depositional thickness and small scale planar distribution. However, the fan deltas at gentle slope, which were widely distributed in the lower part of 1st Member of the Liushagang Formation at Southwestern Weizhou Salient in the southern of the study area, had a mixed gravity flow and tractive current with relatively fine grain-sized, a small depositional thickness and a wide range of planar extension. The development and distribution of these two kinds of fan deltas were mainly controlled by structural framework, paleotopography and basal level change.

Key words: Weixinan Depression, 1st Member of Liushagang Formation, the fan delta at gentle slope area, the fan delta at abrupt slope area, sedimentary characteristic

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