渤海沙垒田地区新近系明下段多河型地震地貌学特征

谈明轩; 朱筱敏; 刘强虎; 刘伟; 李顺利; 赵芳

doi:10.11781/sysydz201903411

渤海沙垒田地区新近系明下段多河型地震地貌学特征

doi: 10.11781/sysydz201903411

谈明轩^1,2,
朱筱敏^1,2, ,,
刘强虎³,
刘伟^1,2,
李顺利⁴,
赵芳^1,2

1. 中国石油大学(北京) 地球科学学院, 北京 102249;
2. 油气资源与探测国家重点实验室, 北京 102249;
3. 中国地质大学(武汉) 资源学院, 武汉 430074;
4. 中国地质大学(北京) 能源学院, 北京 100083

基金项目:

国家科技重大专项（2017ZX05001002-002）资助。

详细信息

作者简介:
谈明轩(1990-),男,博士研究生,从事层序地层学、沉积学研究。E-mail:mingxuantan0301@hotmail.com。

通讯作者:
朱筱敏(1960-),男,教授,博士生导师,从事层序地层学、地震沉积学、储层地质学研究。E-mail:xmzhu@cup.edu.cn。

中图分类号: TE121.31
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- 被引次数: 0
出版历程
- 收稿日期: 2019-01-03
- 修回日期: 2019-04-20
- 刊出日期: 2019-05-28

Seismic geomorphological characteristics of multiple fluvial patterns in the Neogene Lower Minghuazhen Member in the Shaleitian area, Bohai Sea

TAN Mingxuan^1,2,
ZHU Xiaomin^{1,2
, ,},
LIU Qianghu³,
LIU Wei^1,2,
LI Shunli⁴,
ZHAO Fang^1,2

1. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China;
2. State of Key Laboratory of Petroleum Resource and Prospecting, Beijing 102249, China;
3. Faculty of Earth Resources, China University of Geosciences, Wuhan, Hubei 430074, China;
4. School of Energy Resources, China University of Geosciences, Beijing 100083, China

摘要

摘要: 渤海沙垒田地区新近系明化镇组下段主要发育河流相沉积，是渤海地区浅层油气勘探的重点。利用地震地貌学方法结合现代河流体系卫星照片，在重点区的若干典型地层切片中识别出顺直河、中-低弯度曲流河（弯曲度1.2~1.8）及辫状河等多种河流地貌类型，并在明下上亚段沉积阶段发现了辫状河、曲流河共存现象。古沉积坡降分析表明，在整体宽缓的沉积背景下，顺直河、曲流河坡降整体偏小，辫状河坡降相对较大。利用地貌-水动力关系进行古流量估算，认为辫状河满岸流量最大可达3 942 m³/s，曲流河满岸流量最小为145 m³/s，顺直河满岸流量一般小于300 m³/s。基于坡降-流量进行河流类型的判别，可增进对研究区不同河型发育特征、多河型地貌、辫曲共存现象及复杂河道砂体空间展布的认识。
- 地震地貌学 /
- 辫曲共存 /
- 多河型 /
- 明化镇组下段 /
- 新近系 /
- 沙垒田地区 /
- 渤海
Abstract: Fluvial deposits are well developed in the lower member of Neogene Minghuazhen Formation in the Shaleitian area, Bohai Sea, which are perceived as the main targets of hydrocarbon exploration for shallow-buried reservoirs in the offshore Bohai Bay Basin. Combined with seismic geomorphological approach and satellites photographs of modern fluvial systems, straight river, low-to medium-sinuosity meandering river (sinuosity 1.2-1.8) and braided river can be well recognized from several typical slices in the study area. And the coexistence of braided and meandering rivers can be well interpreted during the deposition of the upper submember of the Lower Minghuazhen Member. According to the reconstruction of paleoslope gradient, the slope gradients of straight and meandering rivers are relatively lower, while they are particularly larger in braided rivers on a gentle-dipping slope. Within the paleodischarge estimation from the geomorphology-hydraulics relation, the bankfull discharge of braided rivers can reach 3 942 m³/s, while meandering rivers can be as low as 145 m³/s. The bankfull discharges of straight rivers are usually less than 300 m³/s. The discrimination of fluvial patterns based on slope gradient and discharge will enhance the understanding of different fluvial patterns, and will provide an important guidance of the geomorphological characteristics of multiple fluvial patterns, the coexistence of braided and meandering rivers and spatial distribution of composite fluvial sandbodies.
- seismic geomorphology /
- coexistence of braided and meandering rivers /
- multiple fluvial patterns /
- the Lower Minghuazhen Member /
- Neogene /
- Shaleitian area /
- Bohai Sea

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