岩性油气藏 ›› 2015, Vol. 27 ›› Issue (1): 95–101.doi: 10.3969/j.issn.1673-8926.2015.01.014

• 油气地质 • 上一篇    下一篇

川中地区下寒武统龙王庙组沉积相特征

杨雪飞 1,2,3,王兴志 1,2,3,代林呈 1,2,3,杨跃明 4,谢继荣 4,罗文军 4   

  1.  1. 西南石油大学 油气藏地质与开发工程国家重点实验室,成都 610500 ; 2. 四川省天然气地质重点实验室,成都 610500 ; 3. 西南石油大学 地球科学与技术学院,成都 610500 ;4. 中国石油西南油气田分公司 勘探开发研究院,成都 610051
  • 出版日期:2015-02-03 发布日期:2015-02-03
  • 作者简介:杨雪飞( 1988- ),女,西南石油大学在读博士研究生,研究方向为沉积及储层地质学。 地址:( 610500 )四川省成都市新都区西南石油大学油气藏地质及开发工程国家重点实验室。 E-mail : yangxf_queen@163.com
  • 基金资助:

    四川省重点学科建设项目(编号: SZD0414 )资助

Sedimentary features of the Lower Cambrian Longwangmiao Formation in the central Sichuan Basin

YANG Xuefei 1,2,3,WANG Xingzhi 1,2,3,DAI Lincheng 1,2,3,YANG Yueming 4,XIE Jirong 4,LUO Wenjun 4   

  1.  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation , Southwest Petroleum University , Chengdu 610500 , China ;2. Key Laboratory of Natural Gas Geology in Sichuan Province , Chengdu 610500 , China ; 3. School of Geoscience and Technology , Southwest Petroleum University , Chengdu 610500 , China ; 4. Research Institute of Exploration and Development , PetroChina Southwest Oil and Gas Field Company , Chengdu 610051 , China
  • Online:2015-02-03 Published:2015-02-03

摘要:

结合四川盆地下寒武统龙王庙组区域地质资料,以及川中地区录井、测井及岩心等资料,探讨了研究区龙王庙组的沉积特征及沉积相展布。 研究认为:川中地区在早寒武世龙王庙组沉积期位于陆表海碳酸盐局限—蒸发台地内,包括局限泻湖、台内滩、台坪和混积潮坪等 4 种亚相。 龙王庙组沉积期经历了 2 次海侵—海退旋回,纵向上发育了 2 套完整的泻湖—台内滩—台坪—混积潮坪沉积组合,分别对应于龙王庙组上段和下段。 泻湖亚相发育于各段底部,具有水体局限和能量弱的沉积特征;台内滩亚相发育于各段中部,分别沉积了一套厚层砂屑白云岩和鲕粒白云岩,在研究区分布稳定;台坪亚相发育于各段中上部,沉积物以浅色细晶粒白云岩为主,具有沉积水体浅且易暴露的沉积环境特征;混积潮坪亚相仅发育于各段顶部,为海退最晚期的沉积产物。受龙王庙组沉积期乐山—龙女寺水下古隆起的影响,川中地区位于水下隆起斜坡部位,水动力整体较强,其沉积相分布与水下古隆起密切相关。

关键词: 黏土矿物, 油气生成, 催化作用, 综述

Abstract:

 

Combining with geological background of Sichuan Basin, this paper studied the sedimentary features of Longwangmiao Formation in the central Sichuan Basin by means of cores, thin section observations and logging analysis. It indicates that the study area was located in restricted-evaporated platform during Longwangmiao period, which includes lagoon, intra-platform shoal, platform flat and tidal flat. During the Longwangmiao period, two episodes of transgression and regression process had occurred, and two sets of lagoon-intra-platform shoal-platform flat-tidal flat sediments developed upward. Lagoon developed in the bottom of Longwangmiao Formation, with deep and low fluid energy. Intraplatform shoal developed in the middle part of Longwangmiao Formation, and it was composed of thick dolarenite and oolitic dolostone with steady distribution in the study area. The fine crystalline dolostone generated in the platform flat with shallow and low energy, where was easy to be exposed to the surface and dissolved by meteoric fresh water. Tidal flat only developed in the top of Longwangmiao Formation, and often formed in the end of the regression. Affected by Leshan-Longnvsi paleouplift under the water, the study area was mainly located in intra-platform shoal with high energy.

Key words: clay minerals, oil and gas generation , catalysis, overview

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