鄂尔多斯盆地东南部晚石炭世—中二叠世沉积环境及演化

王若谷; 周进松; 张建锋; 米伟伟; 张家騛; 高泽; 刘楠; 李文厚

doi:10.16152/j.cnki.xdxbzr.2024-06-008

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鄂尔多斯盆地东南部晚石炭世—中二叠世沉积环境及演化

鄂尔多斯盆地岩相古地理与沉积演化 | 更新时间：2024-12-16

- 鄂尔多斯盆地东南部晚石炭世—中二叠世沉积环境及演化
- Sedimentary environment and evolution of Late Carboniferan-Middle Permian in southeastern Ordos Basin
- 西北大学学报（自然科学版） 2024年54卷第6期页码：1023-1036
- 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.西北大学　地质学系/大陆动力学国家重点实验室，陕西　西安　 710069
- 作者简介：
  
  王若谷，女，博士，高级工程师，从事天然气勘探地质综合研究，wrg_8922@163.com。
- 基金信息：
  
  国家自然科学基金重点项目(42230815;41630312)
- DOI：10.16152/j.cnki.xdxbzr.2024-06-008
  中图分类号： P595
- 纸质出版日期：2024-12-25，
  
  收稿日期：2024-09-27，
- 稿件说明：
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王若谷, 周进松, 张建锋, 等. 鄂尔多斯盆地东南部晚石炭世—中二叠世沉积环境及演化[J]. 西北大学学报（自然科学版）, 2024,54(6):1023-1036.

WANG RUOGU, ZHOU JINSONG, ZHANG JIANFENG, et al. Sedimentary environment and evolution of Late Carboniferan-Middle Permian in southeastern Ordos Basin. [J]. Journal of northwest university (natural science edition), 2024, 54(6): 1023-1036.
王若谷, 周进松, 张建锋, 等. 鄂尔多斯盆地东南部晚石炭世—中二叠世沉积环境及演化[J]. 西北大学学报（自然科学版）, 2024,54(6):1023-1036. DOI： 10.16152/j.cnki.xdxbzr.2024-06-008.

WANG RUOGU, ZHOU JINSONG, ZHANG JIANFENG, et al. Sedimentary environment and evolution of Late Carboniferan-Middle Permian in southeastern Ordos Basin. [J]. Journal of northwest university (natural science edition), 2024, 54(6): 1023-1036. DOI： 10.16152/j.cnki.xdxbzr.2024-06-008.

摘要

通过对鄂尔多斯盆地东南部上古生界泥岩样品微量元素的分析测试，并结合岩石沉积学特征、地球物理测井等多种方法，定性、半定量及定量地分析整个研究区晚石炭世本溪组至中二叠世下石盒子组盒8段的沉积水体环境和古气候等特征，并在此基础上探讨沉积环境的演化特征。结果表明，砂岩中多以反应牵引流水动力条件的沉积构造为主，沉积期水动力较强；Sr/Ba值指示研究区处于混合水-淡水环境；岩性组合、典型自生矿物、V/Cr、Ni/Co、V/(V+Ni)、δU及自然伽马能谱测井资料定性及半定量判别表明，研究区主体为富氧浅水环境；结合La-Co法定量判别认为研究区古水体深度多小于25 m，但古水深频繁变化；Sr/Cu值指示研究区属温湿的古气候。由本溪组至下石盒子组盒8段，水体盐度逐步降低，水体深度稳步下降，古气候由湿润趋于干燥，亦揭示出鄂尔多斯盆地东南部上古生界经历了由近海湖盆至内陆湖盆的沉积演化过程。

Abstract

By conducting analysis and testing of trace elements in mudstone samples from the Upper Paleozoic strata in the southeastern Ordos Basin

and integrating various methods such as sedimentary geological characteristics and geophysical logging

this study qualitatively

semi-quantitatively

and quantitatively analyzes the sedimentary water body environment and paleoclimate features of the Late Carboniferous Benxi Formation to the Middle Permian Xiashihezi Formation He 8 Member. Furthermore

it explores the evolutionary characteristics of the sedimentary environment based on these findings. The results indicate that the Upper Paleozoic strata are primarily characterized by sedimentary structures reflecting traction flow conditions. During sandstone deposition periods

water dynamics were notably strong. The Sr/Ba value suggests that the study area is situated within a mixed water-freshwater environment. Qualitative and semi-quantitative assessments based on rock composition

typical self-formed minerals

the values of V/Cr

Ni/Co

V/(V+Ni)

δU

as well as natural gamma ray spectral logging data collectively indicate that an oxygen-rich shallow water environment predominates in the study area. Furthermore

quantitative judgment using La-Co law indicates that paleo-water depths in this region generally did not exceed 25 meters but exhibited frequent fluctuations. The Sr/Cu value points to a warm and humid ancient climate prevailing in this area. From Benxi Formation to Xiashihezi Formation He 8 Member

the salinity of water bodies gradually decreased while their depth steadily diminished. Additionally

the paleoclimate transitioned from humid to dry

revealing a sedimentary evolution process from nearshore basin to inland basin for Upper Paleozoic strata in southeastern Ordos Basin.

关键词

古盐度古水深古气候微量元素晚石炭世—中二叠世鄂尔多斯盆地东南部

Keywords

paleosalinitypaleo-water depthpaleoclimatetrace elementLate Carboniferan-Middle Permiansoutheastern Ordos Basin

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