陆相坳陷湖盆深水重力流沉积类型、模式及控制因素分析—以鄂尔多斯盆地延长组长7段为例

王岚; 王秀娟; 李文厚; 惠萧; 刘羽汐; 杨文敬; 夏晓敏; 白斌

doi:10.16152/j.cnki.xdxbzr.2024-06-013

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陆相坳陷湖盆深水重力流沉积类型、模式及控制因素分析—以鄂尔多斯盆地延长组长7段为例

鄂尔多斯盆地岩相古地理与沉积演化 | 更新时间：2024-12-16

- 陆相坳陷湖盆深水重力流沉积类型、模式及控制因素分析—以鄂尔多斯盆地延长组长7段为例
- 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
- 西北大学学报（自然科学版） 2024年54卷第6期页码：1091-1103
- 作者机构：
  
  1.中国石油勘探开发研究院，北京　 100083
  2.多资源协同陆相页岩油绿色开采全国重点实验室，大庆　 163712
  3.中国石油长庆油田分公司，陕西　西安　 710018
  4.低渗透油气田勘探开发国家工程实验室，陕西　西安　 710018
  5.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
  6.青海油田勘探开发研究院，甘肃　敦煌　 736202
- 作者简介：
  
  王岚，女，高级工程师，从事沉积储层及非常规油气地质研究，wl2008@petrochina.com.cn。
  白斌，男，博士，高级工程师，从事致密油/页岩油形成条件与富集规律研究，baibin81@petrochina.com.cn
- 基金信息：
  
  国家自然科学基金(42072186);中国石油天然气股份有限公司科技课题(2023DJ84)
- DOI：10.16152/j.cnki.xdxbzr.2024-06-013
  中图分类号： P618.12
- 纸质出版日期：2024-12-25，
  
  收稿日期：2024-09-05，
- 稿件说明：
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王岚, 王秀娟, 李文厚, 等. 陆相坳陷湖盆深水重力流沉积类型、模式及控制因素分析—以鄂尔多斯盆地延长组长7段为例[J]. 西北大学学报（自然科学版）, 2024,54(6):1091-1103.

WANG LAN, WANG XIUJUAN, LI WENHOU, et al. 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. [J]. Journal of northwest university (natural science edition), 2024, 54(6): 1091-1103.
王岚, 王秀娟, 李文厚, 等. 陆相坳陷湖盆深水重力流沉积类型、模式及控制因素分析—以鄂尔多斯盆地延长组长7段为例[J]. 西北大学学报（自然科学版）, 2024,54(6):1091-1103. DOI： 10.16152/j.cnki.xdxbzr.2024-06-013.

WANG LAN, WANG XIUJUAN, LI WENHOU, et al. 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. [J]. Journal of northwest university (natural science edition), 2024, 54(6): 1091-1103. DOI： 10.16152/j.cnki.xdxbzr.2024-06-013.

摘要

鄂尔多斯盆地长7深水沉积是大型坳陷湖盆深水重力流的典型代表。基于多口取心井厘米级岩心描述和测录井、薄片资料，对长7深水重力流沉积的类型、特征、流体性质和沉积演化过程进行探索。明确深水沉积包括4种类型：深湖泥页岩沉积、滑塌沉积、砂质碎屑流沉积、浊流沉积。剖面上三角洲前缘砂体在外力触发条件下发生滑塌，转变为砂质碎屑流，最终演化为浊流。平面上三角洲前缘坡折带末端发育大面积砂质碎屑流舌状体，其前端的浊流沉积呈扇状分布。鄂尔多斯盆地晚三叠世独特的构造背景、气候条件以及强烈的造山活动，造就了鄂尔多斯盆地特有的重力流沉积模式。砂质碎屑流和浊流砂体分别对应长7页岩油的一类、二类砂体，具有近源成藏的优势，油气资源量可观，目前已产生规模效益。

Abstract

The deep-water sedimentary system of Chang 7 in the Ordos Basin is a typical representative of deep-water gravity flow in large depression lake basins. Exploring the types

characteristics

fluid properties

and sedimentary evolution process of deepwater gravity flow sedimentation in Chang 7 based on centimeter level core descriptions

logging

and thin section data from multiple core wells. There are four types of deep-water sedimentation: deep lake mud shale sedimentation

landslide sedimentation

sandy debris flow sedimentation

and turbidity current sedimentation. The delta front sand body on the profile undergoes collapse under external force triggering conditions

transforming into sandpaper debris flow and ultimately evolving into turbidity current. On the plane

a large area of sandy debris flow tongue shaped bodies are developed at the end of the delta front slope break zone

and turbidite deposits are distributed in a fan-shaped pattern. The unique tectonic background and climatic conditions of the Late Triassic in the Ordos Basin

as well as strong orogenic activity

formed a gravity flow sedimentary model unique to this type of large depression lake basin. The sandy debris flow and turbid flow sand bodies are the first and second types of sand bodies of Chang 7 shale oil

respectively

and have currently formed economies of scale.

关键词

鄂尔多斯盆地长7油层组深水重力流沉积环境成因模式

Keywords

Ordos BasinChang 7 oil-bearing formationdeep water gravity flowsedimentary environmentgenetic model

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