基于AUV观测数据的南海东沙北部浅表层精细地质特征及其灾害因素分析

doi:10.11978/2022025

热带海洋学报 ›› 2023, Vol. 42 ›› Issue (1): 114-123.doi: 10.11978/2022025CSTR: 32234.14.2022025

所属专题：海洋大数据及应用

基于AUV观测数据的南海东沙北部浅表层精细地质特征及其灾害因素分析

李彦杰¹(), 朱友生¹(), 陈冠军¹, 王姝¹, 王微微²

1.中海油田服务股份有限公司物探事业部, 天津 300459
2.中国石油大学(华东)控制科学与工程学院, 山东青岛 266580

收稿日期:2022-02-14 修回日期:2022-06-14 出版日期:2023-01-10 发布日期:2022-06-17
通讯作者: 朱友生。email: zhuysh2@cosl.com.cn
作者简介:
李彦杰(1982—), 男, 山西运城人, 硕士研究生, 从事海洋工程勘察技术研究与应用。email: liyj17@cosl.com.cn
基金资助:
自然科学基金面上项目(42176083)

Analysis of shallow surface fine geological characteristics and hazard factors of the seabed in the northern part of Dongsha, South China Sea based on AUV data

LI Yanjie¹(), ZHU Yousheng¹(), CHEN Guanjun¹, WANG Shu¹, WANG Weiwei²

1. Geophysical-China Oilfield Services Limited, Tianjin 300459, China
2. College of Control Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China

Received:2022-02-14 Revised:2022-06-14 Online:2023-01-10 Published:2022-06-17
Contact: ZHU Yousheng. email: zhuysh2@cosl.com.cn
Supported by:
National Natural Science Foundation of China(42176083)

摘要/Abstract

摘要：

全面认识海底浅表层地质特征是识别和评价浅层海洋地质灾害的基础, 对海洋资源开发、海洋工程建设等有重要意义。南海东沙北部有多个油气田正在勘探开发, 但目前缺少对东沙北部海底浅表层精细地质特征的系统分析。针对南海东沙北部水深100~400m区域, 综合利用AUV(autonomous underwater vehicle)多波束、AUV浅地层剖面、二维地震、沉积物测试等数据, 识别了浅表层地质灾害因素, 并对其风险性进行了评估。调查发现, 研究区海底表层沉积物总体相对稳定, 发育有沙波、陡坎、冲沟等海底微地貌; 海底以下浅层未见浅层气, 多处发育埋藏古河道。海底沙波的形态和分布特征具有显著的空间差异, 波高大于1m的沙波主要分布于水深134~143m、168~187m、205m以深区域, 并且能够在现代动力条件下发生移动, 观测结果显示海底沙波的发育与内波过程相关。陡坎坡度超过20°, 本文认为这与贯穿浅层的断层有关。

关键词: AUV, 地质特征, 灾害因素, 南海, 沙波

Abstract:

A comprehensive understanding of the geological characteristics of shallow strata of seabed is the basis for identifying and evaluating shallow marine geological hazards, which is of great significance to the development of marine resources and marine engineering construction. Multiple oil and gas fields are being explored and developed in northern Dongsha, South China Sea. However, there is a lack of systematic analysis of the fine geological characteristics of the shallow strata in this place. Based on the diverse data of AUV (autonomous underwater vehicle), multi-beam, AUV shallow stratum profile, 2D seismic data and sediment test, the factors of shallow strata geological hazards were identified and their risks were evaluated in the area of 100~400m water depth in northern Dongsha, South China Sea. The survey found that the seabed surface sediments in the study area were generally relatively stable, and several micro-geomorphologies of the seabed, such as sand waves, steep steps and gullies developed. Shallow gas below the seabed was not observed, and numerous paleovalleys are developed. Significant spatial differences are featured in the shape and distribution characteristics of seabed sand waves. The sand waves with wave height greater than 1m are mainly distributed in the depths of 134~143m, 168~187m and 205m, they can move positions under modern dynamic conditions. The observation results show that the development of seabed sand waves is related to the process of internal waves. The steep steps are more than 20°, which is considered to be related to the faults running through the shallow strata.

Key words: AUV, geological characteristics, geohazard factors, South China Sea, sand waves

李彦杰, 朱友生, 陈冠军, 王姝, 王微微. 基于AUV观测数据的南海东沙北部浅表层精细地质特征及其灾害因素分析[J]. 热带海洋学报, 2023, 42(1): 114-123.

LI Yanjie, ZHU Yousheng, CHEN Guanjun, WANG Shu, WANG Weiwei. Analysis of shallow surface fine geological characteristics and hazard factors of the seabed in the northern part of Dongsha, South China Sea based on AUV data[J]. Journal of Tropical Oceanography, 2023, 42(1): 114-123.

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深度范围/m	280~292	230~280	205~220	187~190	168~187	151~155	143~146	134~143	131~134
波长/m	50~150	65~220	50~60	<10	50~110	<10	<10	40~130	<10
波高/m	2.3~5.1	1.3~5.1	1.3~1.5	<0.5	1.3~3.0	<0.5	<0.5	1~2.8	<0.4

基于AUV观测数据的南海东沙北部浅表层精细地质特征及其灾害因素分析

Analysis of shallow surface fine geological characteristics and hazard factors of the seabed in the northern part of Dongsha, South China Sea based on AUV data

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