天然气地球科学 ›› 2021, Vol. 32 ›› Issue (3): 382–392.doi: 10.11764/j.issn.1672-1926.2020.11.002

• 天然气地质学 • 上一篇    下一篇

混积层系沉积、层序特征——以鄂尔多斯盆地高桥地区本溪组为例

刘桂珍1,2(),高伟3,尉加盛4,唐文1,2   

  1. 1.西安石油大学地球科学与工程学院,陕西 西安 710065
    2.西安石油大学陕西省油气成藏地质学重点实验室,陕西 西安 710065
    3.中国石油长庆油田分公司油气工艺研究院,陕西 西安 710018
    4.中国石油长庆油田分公司第六采气厂,陕西 榆林 718500
  • 收稿日期:2020-07-09 修回日期:2020-10-27 出版日期:2021-03-10 发布日期:2021-03-22
  • 作者简介:刘桂珍(1976-),女,甘肃天水人,副教授,博士,主要从事沉积学及储层地质学研究. E-mail:liuguizhen509@xsyu.edu.cn.
  • 基金资助:
    国家自然科学基金项目“湖盆深水砂岩中碳酸盐胶结物成因及分布规律——以鄂尔多斯盆地延长组为例”(41602156);陕西省自然科学基础研究计划项目“基于高光谱图像的碳酸盐岩岩溶识别及其表征研究”(2019JM-381);陕西省教育厅科研计划项目“古岩溶风化壳储层模型及三维正演模型研究”(18JS091)

Sedimentary characteristics and sequence stratigraphy in a mixed silicilastic-carbonate depositional system: Case study of Benxi Formation in Gaoqiao area, Ordos Basin

Gui-zhen LIU1,2(),Wei GAO3,Jia-sheng WEI4,Wen TANG1,2   

  1. 1.School of Earth Sciences and Engineering,Xi′an Shiyou University,Xi′an 710065,China
    2.Shaanxi Key Laboratory of Petroleum Accumulation Geology,Xi′an Shiyou University,Xi′an 710065,China
    3.Research Institute of Petroleum Exploration and Development,Changqing Oilfield Company,Xi′an 710018,China
    4.No. 6 Oil Production Plant,PetroChina Changqing Oilfield Company,Yulin 718500,China
  • Received:2020-07-09 Revised:2020-10-27 Online:2021-03-10 Published:2021-03-22
  • Supported by:
    The National Natural Science Foundation of China(41602156);the Natural Science Research Program of Shaanxi Province(2019JM-381);The Scientific Research Project of the Education Department of Shaanxi Province(18JS091)

摘要:

鄂尔多斯盆地高桥地区本溪组发育陆源碎屑岩和碳酸盐岩混合沉积。综合前人研究成果,根据野外露头、岩心、录井和测井等资料,分析了混积层系沉积、层序充填特征。结果表明:本溪组发育陆源碎屑岩和碳酸盐岩相互叠加的混积层系,发育碎屑岩潮坪、混积潮坪和混积潟湖等沉积体系。根据层序地层原理,识别出1个区域不整合面、1个构造沉降转换面和1个岩性、岩相转换面,将本溪组划分为SQ1、SQ2共2个三级层序,其中每个层序主要由海进体系域(TST)和高位体系域(HST)组成。本溪组沉积是以陆源碎屑岩沉积为主的混积层系,混积层系主要发育在SQ2海进体系域(TST)。不同沉积区域自下而上混合沉积岩性岩相组合有差异。混积潮坪区由潮道相砂岩上覆叠置潮间带砂泥岩再到灰岩;混积潟湖区由灰岩上覆叠置潟湖泥岩;混积潮坪和混积潟湖过渡区由灰岩叠置潮下带砂岩和潮间带砂泥岩。

关键词: 本溪组, 混积层系, 沉积相, 层序地层, 鄂尔多斯盆地

Abstract:

A mixed siliciclastic-carbonate succession is developed in Benxi Formation in the Gaoqiao area of Ordos Basin. On the basis of previous researches, sedimentary characteristics and sequence stratigraphy in a mixed silicilastic-carbonate depositional system of Benxi Formation were studied based on outcrop, core data, logging and well logs data in Gaoqiao area of Ordos Basin. It shows that the Benxi Formation is mainly composed of tidal flat depositional system which is subdivided into the siliciclastic tidal flat facies, the mixed tidal flat facies and mixed lagoon facies. According to the principle of sequence stratigraphy, one regional unconformity surface, one tectonic subsidence transition surface and one lithology and lithofacies transition surfaces are identified. The Benxi Formation is divided into SQ1-SQ2 of the 3rd-order sequences. Each sequence is mainly composed of transgressive system tract (TST) and highstand system tract (HST). The mixed siliciclastic-carbonate succession of Benxi Formation is developed under the circumstance of dominated silicicclastic sediments. Mixed sedimentation mainly occurred at the stage of TST of SQ2.The lithologic and lithofacies assemblages of mixed siliciclastic-carbonate succession are different in different sedimentary areas. The intertidal sandstone and mudstone are superimposed on the tidal channel facies sandstone and then to the limestone in the mixed tidal flat area. The lagoon mudstone is superimposed on the limestone in the mixed lagoon area. The limestone is superimposed on the subtidal sandstone and intertidal sandstone in the transitional area of the mixed tidal flat and the mixed lagoon.

Key words: Benxi Formation, Mixed siliciclastic-carbonate system, Sedimentary facies, Sequence strati-graphy, Ordos Basin

中图分类号: 

  • TE121.3

图1

鄂尔多斯盆地高桥地区位置和本溪组地层划分对比(a)高桥地区构造位置;(b)高桥地区与太原西山地区地层划分对比(据文献[20],有修改)"

图2

鄂尔多斯盆地高桥地区本溪组岩心照片(a)和沉积相图(b)"

图3

碎屑岩沉积区本溪组层序界面特征"

表1

本溪组内部层序界面特征"

相区碎屑岩潮坪混积潮坪混积潟湖
层序界面上砂岩(潮下带砂坪、潮道)灰岩(混积灰坪)灰岩(混积潟湖)
层序界面下泥岩、煤层(潮间带、潮上带)泥岩(潮间带)泥岩(潟湖)

图4

本溪组混合沉积区层序界面特征"

图5

高桥地区G79-21井本溪组层序地层综合柱状图"

图6

鄂尔多斯盆地南部本溪组层序地层格架(东西向)"

图7

鄂尔多盆地高桥地区本溪组层序地层格架及岩相分布模式"

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