鄂尔多斯盆地三叠系延长组7段深水碎屑流沉积特征及成因

doi:10.11743/ogg20210505

石油与天然气地质 ›› 2021, Vol. 42 ›› Issue (5): 1063-1077.doi: 10.11743/ogg20210505

鄂尔多斯盆地三叠系延长组7段深水碎屑流沉积特征及成因

周新平^1,²(), 何青^3,⁴, 刘江艳^1,², 李士祥^1,², 杨田^3,^4,*()

1. 低渗透油气田勘探开发国家工程实验室, 陕西西安 710018
2. 中国石油长庆油田分公司勘探开发研究院, 陕西西安 710018
3. 成都理工大学油气藏地质及开发工程国家重点实验室, 四川成都, 610059
4. 成都理工大学沉积地质研究院, 四川成都, 610059

收稿日期:2020-10-13 出版日期:2021-10-28 发布日期:2021-10-26
通讯作者: 杨田 E-mail:zhxp13_cq@petrochina.com.cn;yangtian9645@126.com; yangtian19@cdut.edu.cn
第一作者简介:周新平(1984-), 男, 博士、高级工程师, 综合地质研究及石油勘探部署。E-mail: zhxp13_cq@petrochina.com.cn
基金项目:
国家自然科学基金项目(42072126);国家自然科学基金项目(41802127);国家重点基础研究发展计划（973计划）项目(2014CB239003);2019年中国石油科技创新基金研究项目(2019D-5007-0106)

Features and origin of deep-water debris flow deposits in the Triassic Chang 7 Member, Ordos Basin

Xinping Zhou^1,²(), Qing He^3,⁴, Jiangyan Liu^1,², Shixiang Li^1,², Tian Yang^3,^4,*()

1. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an, Shaanxi 710018, China
2. Exploration and Development Research Institute of Changqing Oilfield Branch Company Ltd., PetroChina, Xi'an, Shaanxi 710018, China
3. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China
4. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan 610059, China

Received:2020-10-13 Online:2021-10-28 Published:2021-10-26
Contact: Tian Yang E-mail:zhxp13_cq@petrochina.com.cn;yangtian9645@126.com; yangtian19@cdut.edu.cn

摘要/Abstract

摘要：

为了明确不同类型深水碎屑流沉积特征及其成因，以鄂尔多斯盆地三叠系延长组7段深水重力流沉积为研究对象，综合测录井资料、岩心观察分析、薄片分析和定量统计，分析碎屑流沉积特征、总结沉积序列和探讨成因机制。研究表明：研究区的深水碎屑流主要发育砂质碎屑流、泥质碎屑流和泥流3种类型。砂质碎屑流沉积以块状砂岩最为常见，漂浮状泥质碎屑发育，单层厚度分布在0.24~1.10 m，平均厚度为0.55 m。泥质碎屑流沉积包含孤立块状沉积和与下伏块状砂岩成对产出两种类型，前者内部大量发育漂浮状泥岩撕裂屑及软沉积物变形构造，后者富含漂浮状泥质碎屑与砂质团块，单层厚度分布在0.21~1.29 m，平均厚度为0.60 m。泥流沉积包含孤立块状沉积和与下伏块状砂岩成对产出两种类型，前者整体为泥质砂岩或砂质泥岩，后者内部可见漂浮状成层排列的毫米级泥质碎片，单层厚度分布在0.20~0.60 m，平均厚度为0.30 m。高浓度砂质沉积物或泥质沉积物搬运过程中环境水体卷入导致的流体转化是形成砂质碎屑流、孤立块状泥质碎屑流和泥流沉积的主要原因。与下部块状砂岩相伴生的泥质碎屑流沉积多为流体侵蚀成因或砂体液化成因；与下部块状砂岩相伴生的泥流沉积包含流体减速膨胀导致的流体转化和碎屑颗粒的差异沉降等成因。

关键词: 砂质碎屑流, 泥质碎屑流, 泥流, 流体转化, 成因机制, 深水重力流, 沉积特征, 鄂尔多斯盆地

Abstract:

The deep-water gravity flow deposits in the 7^th member of the Triassic Yanchang Formation (Chang 7 Member), Ordos Basin, are taken as the main research object to investigate the sedimentary characteristics and genesis of different types of subaqueous debris flow deposits.An integration of log data, core observation and analysis, thin section analysis and quantitative statistics, is applied to discuss the features, sedimentary sequences and genetic mechanisms of debris flow deposits.The results show that the deep-water debris flows in the study area mainly consists of 3 types, that is sandy debris flow, muddy debris flow and muddy flow.Deposits of the first type feature massive sandstone with floating argillaceous debris and a single layer thickness of 0.24 m to 1.10 m, averaging 0.55 m.Those of the second type occur either in isolated massive deposition or in massive argillaceous deposition paired with the underlying massive sandstone: the former is rich in floating mudstone tearing debris and deformation structures of soft sediments, while the latter is rich in floating muddy debris and sandy agglomerates with a single layer thickness ranging from 0.21 m to 1.29 m, averaging 0.60 m.The occurrence of the third type resembles the first type, while its former is composed of sandy mudstone or argillaceous sandstone, and its latter has floating argillaceous chips of millimeter scale in laminar, with a single layer thickness ranging from 0.20 m to 0.60 m, averaging 0.30 m.The flow transformation caused by the involvement of environmental water body in the process of high-concentration sandy or muddy sediment transport, is the main reason for the formation of sandy debris flow deposits, isolated massive muddy debris flow deposits, and mud flow deposits.The muddy debris flow deposits paired with the underlying massive sandstone is mainly caused by flow erosion or sand body liquefaction; and the mud flow deposits paired with the underlying massive sandstone may be caused by flow transformation resulted from deceleration and expansion, and differential settlement of clastic particles.

Key words: sandy debris flow, muddy debris flow, muddy flow, flow transformation, genesis, deepwater gravity flow, sedimentary characteristics, Ordos Basin

中图分类号:

TE121.3

周新平,何青,刘江艳,等. 鄂尔多斯盆地三叠系延长组7段深水碎屑流沉积特征及成因[J]. 石油与天然气地质, 2021, 42(5): 1063-1077. doi: 10.11743/ogg20210505 Xinping Zhou,Qing He,Jiangyan Liu,et al. Features and origin of deep-water debris flow deposits in the Triassic Chang 7 Member, Ordos Basin[J]. Oil & Gas Geology, 2021, 42(5): 1063-1077. doi: 10.11743/ogg20210505

图/表 10

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鄂尔多斯盆地三叠系延长组7段深水碎屑流沉积特征及成因

Features and origin of deep-water debris flow deposits in the Triassic Chang 7 Member, Ordos Basin

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