东海西湖凹陷中南部工程地质层层序划分及特征
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摘要
东海西湖凹陷中南部是目前东海油气资源较为丰富的区域之一,海底工程地质调查是海洋油气田勘探开发工作中一项不可或缺的内容。过去数十年中,虽然海洋地质工作者为确保该区石油钻探平台安全就位和施工开展了大量井场调查工作,但多侧重于单个井场的海底不稳定因素(地质灾害)和平台桩基持力土层的物理力学特性调查和评价,对构成工程地质条件的基础,即海底工程地质地层的成因、层序特征和分布规律研究甚少。为此,根据浅地层剖面的层序地层学研究成果,以及区内的海洋地质和工程地质钻孔资料,对构成本区工程地质层的地震相特征、沉积环境条件、沉积相、沉积序列和各层序的物理力学特点作了分析研究,在此基础上综合确定划分出五套工程地质层,首次建立了该区域的工程地质层层序序列,并进行了土层编号。为后续的井场地质调查工作提供一些基础资料和技术研究思路。
The Central South Area of Xihu Depression is an area with abundant petroleum resources in East China Sea.The pre-drilling engineering geology investigation(site investigation) is an indispensable part among offshore petroleum E&P,which is crucial for stability of drilling platforms' foundation and safely of drilling process.Up to now,most of study is focused on individual drilling site.In individual drill site scale,the site's seafloor instable factors(geohazards) and soil's bearing capacity which affects platform foundation's stability are studied.However,study on the forming mechanism,sequence,distribution characteristics of geotechnical strata on regional scale is scare.Understanding the regional geotechnical stratigraphy sequences of a specific area is crucial for following site investigation in this area.By stratigraphy sequences study using sub-bottom profiler data and study on regional marine geology and geotechnical drilling data,this paper analyzes the seismic facies,sedimentary environment,sedimentary facies,sedimentary sequences,and mechanical characteristics of Central South Area of Xihu Depression's geotechnical strata.After integrated study, this area's geotechnical strata are divided into five geotechnical sequences.This area's overall geotechnical sequences are established for the first time,and the soil layers are numbered.The result can be used as guideline for the following site investigation in this area.
The Central South Area of Xihu Depression is an area with abundant petroleum resources in East China Sea.The pre-drilling engineering geology investigation(site investigation) is an indispensable part among offshore petroleum E&P,which is crucial for stability of drilling platforms' foundation and safely of drilling process.Up to now,most of study is focused on individual drilling site.In individual drill site scale,the site's seafloor instable factors(geohazards) and soil's bearing capacity which affects platform foundation's stability are studied.However,study on the forming mechanism,sequence,distribution characteristics of geotechnical strata on regional scale is scare.Understanding the regional geotechnical stratigraphy sequences of a specific area is crucial for following site investigation in this area.By stratigraphy sequences study using sub-bottom profiler data and study on regional marine geology and geotechnical drilling data,this paper analyzes the seismic facies,sedimentary environment,sedimentary facies,sedimentary sequences,and mechanical characteristics of Central South Area of Xihu Depression's geotechnical strata.After integrated study, this area's geotechnical strata are divided into five geotechnical sequences.This area's overall geotechnical sequences are established for the first time,and the soil layers are numbered.The result can be used as guideline for the following site investigation in this area.
引文
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[2]张异标,杨文达.层状地层中自升式钻井平台桩脚稳定性分析[J].海洋石油,2005,25(4)91-95.
[3]周俊昌.南黄海铁板砂海床插桩问题分析与对策——常州35-2-1井插桩及作业过程分析[J].中国海上油气(工程), 2003,15(4):1-4.
[4]曹式敬,宋林松,黎剑波,等.自升式平台穿刺计算方法探讨[J].海洋石油,2011,31(1):86-89.
[5]VINCENT P B,等.自升式钻井平台底座在层状软土底质中的稳定性[J].孙克虬,译.海洋工程地质专辑,1985,(10):120 -134.
[6]杨文达.东海海底沙脊的结构及沉积环境[J].海洋地质与第四纪地质,2002,22(1):9-15.
[7]杨子赓,林和茂.中国第四纪地层与国际对比[M].北京:地质出版社,1996:10-13,56-74.
[8]Oppo D W,SUN Youbin.Amplitude and timing of sea-surface temperature change in the northern South China Sea:Dynamic link to the East Asian monsoon[J].Geology,2005,33(10): 785-788.
[9]葛黄敏,李前裕,成鑫荣,等.南海北部晚第四纪高分辨率浮游氧同位素地层学及其古气候信息[J].地球科学——中国地质大学学报,2010,35(4):515-525.
[10]WANG Yongjin,CHENG Hai,Edwards R L,et al.Millennial-and orbital scale changes in the East Asian monsoon over the past 224,000 years[J].Nature,2008,451(28):1090-1093.
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