Sedimentary facies characteristics and distribution patterns of the sub-member Ma 5<sub>1</sub> in the Majiagou Formation, eastern Yanchang exploration block, Ordos Basin

CAO Hongxia; WU Haiyan; ZHAO Hang; WANG Zhenguo; REN Xingmin; GUO Yanqin; LI Baiqiang; LUO Ke

doi:10.16152/j.cnki.xdxbzr.2026-03-015

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Sedimentary facies characteristics and distribution patterns of the sub-member Ma 5₁ in the Majiagou Formation, eastern Yanchang exploration block, Ordos Basin

更新时间：2026-07-07

- Sedimentary facies characteristics and distribution patterns of the sub-member Ma 5₁ in the Majiagou Formation, eastern Yanchang exploration block, Ordos Basin
- Journal of Northwest University (Natural Science Edition) Vol. 56, Issue 3, Pages: 627-638(2026)
- 作者机构：
  
  1.陕西延长石油（集团）有限责任公司天然气研究院，陕西　西安　710065
  2.西安石油大学　地球科学与工程学院，陕西　西安　710065
  3.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
  4.安徽理工大学　地球与环境学院，安徽　淮南　232001
- 作者简介：
- 基金信息：
- DOI：10.16152/j.cnki.xdxbzr.2026-03-015
  CLC： P631.81
- Received：17 November 2025，
  
  Revised：2025-12-14，
  
  Published：25 June 2026
- 稿件说明：
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CAO Hongxia, WU Haiyan, ZHAO Hang, et al. Sedimentary facies characteristics and distribution patterns of the sub-member Ma 5₁ in the Majiagou Formation, eastern Yanchang exploration block, Ordos Basin[J]. Journal of Northwest University (Natural Science Edition), 2026, 56(3): 627-638. DOI: 10.16152/j.cnki.xdxbzr.2026-03-015.
DOI：

CAO Hongxia, WU Haiyan, ZHAO Hang, et al. Sedimentary facies characteristics and distribution patterns of the sub-member Ma 5₁ in the Majiagou Formation, eastern Yanchang exploration block, Ordos Basin[J]. Journal of Northwest University (Natural Science Edition), 2026, 56(3): 627-638. DOI: 10.16152/j.cnki.xdxbzr.2026-03-015. DOI：

摘要

以鄂尔多斯盆地延长探区东部马家沟组五段1亚段（简称“马五

亚段”）为例，在小层精细划分结果的基础上，通过岩心观察、薄片鉴定以及测井沉积微相单井解释与连井剖面对比，探究研究区马五

亚段4个小层的沉积微相类型及平面展布特征，进而明确各小层的沉积微相分布及演化规律。研究表明，研究区为局限台地亚相沉积环境，可细分为泥云坪、云坪、灰坪以及泥坪沉积微相。马五

小层主要发育云坪、泥云坪和泥坪沉积微相，云坪主要分布于研究区西北部和中部，其余广大地区为泥云坪沉积，泥坪仅分布在研究区西南部；马五

小层沉积时期，由于局部地区蒸发作用的增强及陆源泥质输入的增加，导致研究区中部云坪沉积及南部泥坪沉积的范围相比马五

小层均增大；马五

小层沉积时期，研究区西部和西南部水体深度相对增加，导致西部云坪沉积和西南部泥坪沉积的范围明显减小，而在西南部和东南部局部地区出现灰坪沉积；马五

小层在研究区西部和中部以泥云坪和泥坪沉积为主，东部以云坪沉积为主，北部局部地区发育灰坪沉积。该研究成果可为探究延长探区沉积微相对强非均质型碳酸盐岩储层的控制机理及储层分布有利区预测提供科学依据。

Abstract

This study focuses on the fifth sub-member of the Majiagou Formation

specifically the first submember (referred to as "sub-member Ma5

") in the eastern Yanchang exploration area. Utilizing the outcomes from the meticulous delineation of smaller stratigraphic units

combined with core observations

thinsection analysis

single-well log sedimentary microfacies interpretation

and comparative inter-well section analysis

we conducted an in-depth examination of the se

dimentary microfacies types and their planar distribution within the four minor layers of the sub-member Ma

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in the study area. This analysis aims to elucidate the distributional and evolutionary patterns of sedimentary microfacies across each minor layer. The results show that the sub-member Ma 5

in the eastern Yanchang exploration area is overall a restricted platform sub-facies deposit

mainly developing mud dolomitic flat

dolomitic flat

lime flat

and muddy flat sedimentary microfacies. The sub-layer Ma

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is characterized by the development of dolomitic flat

mud dolomitic flat

and muddy flat. Dolomitic flats are predominantly found in the northwest and central parts of the study area

while mud dolomitic flat cover the rest majority of the region. Muddy flats are notably restricted to the southwest portion of the study area. During the deposition of the sub-layer Ma

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the expansion of dolomitic flat in the central part of the study area and muddy flat in the south has increased compared to the sub-layer Ma

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attributed to enhanced evaporation in some local areas and an increase in terrigenous muddy input. During the sedimentation of the sub-layer Ma

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a relative increase in water depth in the western and southwestern parts of the study area resulted in a significant reduction in the extent of dolomitic flat in the west and muddy flat in the southwest. Concurrently

lime flat emerged in some local areas of the southwest and southeast. In the sub-layer Ma

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mud dolomitic and muddy flat predominantly occurred in the western and central parts of the study area

while dolomitic flat was mainly found in the eastern part. Additionally

lime flat developed in some northern local areas. The research results can provide scientific reference for the control mechanism of sedimentary microfacies on strongly heterogeneous carbonate reservoirs and the prediction of favorable areas for favorable reservoir distribution in the Yanchang exploration area.

关键词

Keywords

references

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Sedimentary facies characteristics and distribution patterns of the sub-member Ma 51 in the Majiagou Formation, eastern Yanchang exploration block, Ordos Basin

DOI：10.16152/j.cnki.xdxbzr.2026-03-015

摘要

Abstract

关键词

Keywords

references

Sedimentary facies characteristics and distribution patterns of the sub-member Ma 5₁ in the Majiagou Formation, eastern Yanchang exploration block, Ordos Basin