鄂尔多斯盆地上三叠统延长组负载构造类型及特征<sup>*</sup>

doi:10.7605/gdlxb.2024.02.012

古地理学报 ›› 2024, Vol. 26 ›› Issue (2): 269-278. doi: 10.7605/gdlxb.2024.02.012

• 岩相古地理学及沉积学 • 上一篇下一篇

鄂尔多斯盆地上三叠统延长组负载构造类型及特征^*

李元昊^1,2, 史立川³, 雷秀洁³, 淡卫东³

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勘探开发研究院,陕西西安 710018

收稿日期:2023-02-14 修回日期:2023-04-28 出版日期:2024-04-01 发布日期:2024-04-03
作者简介:李元昊,男,1976年生,博士,西安石油大学副教授,主要从事沉积学方面的研究。E-mail: liyuanh@xsyu.edu.cn。
基金资助:
*陕西省教育厅重点实验室项目(编号: 20JS127)资助

Types and characteristics of load structures in the Upper Triassic Yanchang Formation,Ordos Basin

LI Yuanhao^1,2, SHI Lichuan³, LEI Xiujie³, DAN Weidong³

1 School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an 710065,China;
2 Key Laboratory of Petroleum Accumulation Geology,Xi’an Shiyou University,Xi’an 710065,China;
3 Exploration and Development Research Institute of PetroChina Changqing Oilfield Company,Xi’an 710018,China

Received:2023-02-14 Revised:2023-04-28 Online:2024-04-01 Published:2024-04-03
About author:LI Yuanhao,born in 1976,is an associate professor in Xi’an Shiyou University. He is mainly engaged in sedimentological research. E-mail: liyuanh@xsyu.edu.cn.
Supported by:
Financially supported by the Key Laboratory Project of Shaanxi Provincial Department of Education(No. 20JS127)

摘要/Abstract

摘要：

负载构造是一种重要的软沉积物变形构造类型,具有重力(密度差)作用是主要驱动力、变形发生在密度倒置的岩性界面等特征。根据变形构造与母体是否分离把负载构造分为3类: 一是未分离的负载构造,包括重荷(模)构造、火焰构造、枕状构造、水滴状构造及底辟(挤入)构造; 二是分离的负载构造,包括砂球(假结核)、砂球层、泥球; 三是复合型负载构造。在鄂尔多斯盆地上三叠统延长组岩心及露头中发现了大量的负载构造,通过对不同类型负载构造的特征描述、形成条件及触发机制分析,认为负载构造是地震和重力作用双重机制作用的结果,除了重力作用外,地震扰动是形成多种变形构造的主要原因,反映了鄂尔多斯盆地在晚三叠世印支期构造活动较强的特征。

关键词: 负载构造, 砂球构造, 地震, 延长组, 鄂尔多斯盆地

Abstract:

Load structures are known as an important type of soft sediment deformation structure,and are characterized by gravity(density difference)as the main driving force and deformation occurring at the lithologic interface with inverted density. According to whether the deformation structures are separated from the parent body,load structures can be divided into three categories including,non-separated load structures,separated load structures,and composite load structures. The non-separated load structures include heavy load(mold)structures,flame structures,water drop structures and diapir(extrusion)structures,and the separated load structures includes sand ball(false nodule),ball pillow layer and mud ball. A large number of load structures were recognized in the cores and outcrops of the Yanchang Formation of the Late Triassic in the Ordos Basin. Through the analysis of the characteristics,formation conditions and triggering mechanisms of different types of load structures,it is believed that the load structures were the result of the dual mechanisms of earthquakes and gravity. In addition to gravity,seismic disturbance was also the main reason for the formation of various deformation structures. It reflects the characteristics of strong tectonic activity in the Ordos basin during the Middle Indosinian Movement.

Key words: load structure, sand ball structures, earthquake, Yanchang Formation, Ordos Basin

中图分类号:

P531

李元昊, 史立川, 雷秀洁, 淡卫东. 鄂尔多斯盆地上三叠统延长组负载构造类型及特征^*[J]. 古地理学报, 2024, 26(2): 269-278.

LI Yuanhao, SHI Lichuan, LEI Xiujie, DAN Weidong. Types and characteristics of load structures in the Upper Triassic Yanchang Formation,Ordos Basin[J]. JOPC, 2024, 26(2): 269-278.

http://www.gdlxb.cn/CN/Y2024/V26/I2/269

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