High-resolution sequence stratigraphy and sedimentary characteristics of Benxi Formation in Yan’an area of Ordos Basin

FAN Mengmeng; YUAN Zhen; LI Wenhou; BU Jun

doi:10.16152/j.cnki.xdxbzr.2024-06-010

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High-resolution sequence stratigraphy and sedimentary characteristics of Benxi Formation in Yan’an area of Ordos Basin

Lithofacies palaeogeography and sedimentary evolution of Ordos Basin | 更新时间：2024-12-16

- High-resolution sequence stratigraphy and sedimentary characteristics of Benxi Formation in Yan’an area of Ordos Basin
- Journal of Northwest University (Natural Science Edition) Vol. 54, Issue 6, Pages: 1050-1064(2024)
- 作者机构：
  
  1.西安科技大学　地质与环境学院/陕西省煤炭绿色开采地质保障重点实验室，陕西　西安　 710054
  2.西安石油大学　地球科学与工程学院，陕西　西安　 710065
  3.陕西省油气成藏地质学重点实验室，陕西　西安　 710065
  4.西北大学　地质学系/大陆动力学国家重点实验室，陕西　西安　 710069
  5.中国石油长庆油田分公司油气工艺研究院/低渗透油气田勘探开发国家工程实验室，陕西　西安　 710021
- 作者简介：
- 基金信息：
- DOI：10.16152/j.cnki.xdxbzr.2024-06-010
  CLC： TE121.3
- Published：25 December 2024，
  
  Received：28 September 2024，
- 稿件说明：
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FAN MENGMENG, YUAN ZHEN, LI WENHOU, et al. High-resolution sequence stratigraphy and sedimentary characteristics of Benxi Formation in Yan’an area of Ordos Basin. [J]. Journal of northwest university (natural science edition), 2024, 54(6): 1050-1064.
DOI：

FAN MENGMENG, YUAN ZHEN, LI WENHOU, et al. High-resolution sequence stratigraphy and sedimentary characteristics of Benxi Formation in Yan’an area of Ordos Basin. [J]. Journal of northwest university (natural science edition), 2024, 54(6): 1050-1064. DOI： 10.16152/j.cnki.xdxbzr.2024-06-010.

摘要

鄂尔多斯盆地延安地区油气资源储藏丰富，本溪组是重要的勘探层段之一，但其沉积环境复杂，砂体分布及沉积演化特征不明确，制约了该地区天然气勘探开发的进程。因此，加强对延安地区本溪组地质学方面的研究，尤其是层序地层、沉积特征及演化的研究，将对该地区的古地理重建、油气勘探及开发提供有利的理论支撑。以高分辨率层序地层学、沉积岩石学、测井地质学和沉积学为理论指导，研究了鄂尔多斯盆地延安地区晚古生代本溪组的地层和沉积特征，确定了其层序地层单元划分、等时地层格架、沉积相类型及演化过程。研究结果表明，在层序地层方面，本溪组内可以识别出1个长期基准面旋回、2个中期基准面旋回和多个短期旋回；在沉积相类型方面，识别出12种岩石类型和7种岩相组合，据此认为延安地区本溪组发育潮坪和障壁岛—潟湖沉积相，进而识别出潮道、砂坪、混合坪、泥坪、泥炭坪、障壁岛砂坝、潟湖泥等沉积微相；在沉积相展布方面，研究区西南部和南部以潮坪沉积为主，东北部和北部以障壁岛—潟湖沉积为主，本1段和本2段的沉积格局基本一致。

Abstract

The oil and gas resources in Yan’an area of Ordos Basin are abundant

and Benxi Formation is one of the important exploration intervals. However

its sedimentary environment is complex

and the distribution of sand bodies and sedimentary evolution characteristics are not clear

which restricts the process of natural gas exploration and development in this area. Therefore

strengthening the study of geology of Benxi Formation in Yan’an area

especially the study of sequence stratigraphy

sedimentary characteristics and evolution

will provide favorable theoretical support for paleogeographic reconstruction

oil and gas exploration and development in this area. Based on the theories of high-resolution sequence stratigraphy

sedimentary petrology

logging geology and sedimentology

the stratigraphic and sedimentary characteristics of the late Paleozoic Benxi Formation in Yan’an area of Ordos Basin were studied

and the sequence stratigraphic unit division

isochronous stratigraphic framework

sedimentary facies types and evolution process were determined. The results show that in terms of sequence stratigraphy

one long-term base-level cycle

two medium-term base-level cycles and multiple short-term cycles can be identified in Benxi Formation. In terms of sedimentary facies types

12 types of lithofacies and 7 lithofacies combinations were identified. According to this

it is considered that tidal flat and barrier island-lagoon sedimentary facies were developed in Benxi Formation in Yan’an area

and sedimentary microfacies such as tidal channel

sand flat

mixed flat

mud flat

peat flat

barrier island and lagoon sediments were identified. In terms of sedimentary facies distribution

tidal flat deposits are mainly developed in the southwest and south

and barrier island-lagoon deposits are mainly developed in the northeast and north. The sedimentary patterns of Ben 1 section and Ben 2 section are basically consistent.

关键词

高分辨率层序地层学沉积演化本溪组延安地区鄂尔多斯盆地

Keywords

high-resolution sequence stratigraphysedimentary evolutionBenxi FormationYan’an areaOrdos Basin

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Lithofacies palaeogeography and sedimentary evolution of Ordos Basin and its periphery

Characteristics and paleogeographic pattern of source-to-sink system of the Jurassic Yan’an Formation in Ordos Basin

Sedimentary microfacies and evolution of Cenozoic Liupanshan Basin

Analysis of sedimentary types, patterns, and controlling factors of deep-water gravity flow in terrestrial depression lake basins—Takeing Chang 7 member of Yanchang Formation of Ordos Basin as an example

Related Author

CHEN Qiang

LI Wenhou

LI Zhichao

ZHANG Qian

LI Wenhou

ZHANG Qian

LI Zhaoyu

LI Keyong

Related Institution

School of Earth Science and Resources/School of Land Engineering, Chang’an University

Department of Geology, Northwest University

College of Chemistry and Chemical Engineering, Shaanxi University of Science & Technology

College of Life Science, Linyi University

College of Geology and Environment, Xi'an University of Science and Technology

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