直流高密度电法在浅海工程勘察中的应用
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摘要
用于海域工程勘察的物探方法相对较少,地震反射波法是水域工程物探的首选方法,但当遇到海底沉积层中含浅层气时,声波信号受屏蔽导致地震探测失效;因此尝试采用直流高密度电法探测浅海工程海底沉积层厚度和基岩面起伏情况。结合电阻率测井资料建立模型并进行正反演计算分析,并通过广东汕头市苏埃通道工程实例证实直流高密度电法可以获得较为理想的探测效果。在局部地震反射波法有效的区段进行两种物探方法的综合解释,可以提高解释的可靠性及解释的精度。
Fewer geophysical methods can be utilized in marine project exploration than in the land.Seismic reflection is the preferred geophysical choice.When the submarine sediments are contaminated by shallow gas,the shielding effect of acoustic signal leads to the failure of seismic detection.In this paper,the high density DC resistivity method was adopted to investigate the submarine sedimentary strata as well as the underlying bedrock.The forward and inverse model was built and calculated based on the resistivity borehole logging data,a shallow onshore engineering with this method was conducted and the results show satisfactory results in the submarine engineering exploration.In some parts of the area where seismic reflection works effectively,the authors explained the geology with comprehensive methods,which could ensure the reliability and improve the accuracy of the interpretation.
Fewer geophysical methods can be utilized in marine project exploration than in the land.Seismic reflection is the preferred geophysical choice.When the submarine sediments are contaminated by shallow gas,the shielding effect of acoustic signal leads to the failure of seismic detection.In this paper,the high density DC resistivity method was adopted to investigate the submarine sedimentary strata as well as the underlying bedrock.The forward and inverse model was built and calculated based on the resistivity borehole logging data,a shallow onshore engineering with this method was conducted and the results show satisfactory results in the submarine engineering exploration.In some parts of the area where seismic reflection works effectively,the authors explained the geology with comprehensive methods,which could ensure the reliability and improve the accuracy of the interpretation.
引文
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[10]Anderson A L,Hampton L D.Acoustics of gas-bearing sedimentsI.Background[J].Journal of the Acoustical Society of America.1980,67(6):1865-1889.
[11]Anderson A L,Hampton L D.Acoustics of gas-bearing sediments.II.Measurements and models[J].The Journal of the AcousticalSociety of America.1980,67(6):1890-1903.
[12]阚光明,刘保华,张维冈,等.珠江口外伶仃洋海底含气沉积物声波反射及衰减特征[J].海洋学报(中文版),2008,(2):26-32.
[2]Archie G E.The electrical resistivity log as an aid in determiningsome reservoir characteristics[J].Transactions of AIME.1942,146:54-62.
[3]Edwards R,Cheesman S.Two dimensional modeling of a towedtransient magnetic dipole-dipole sea floor EM system[J].Journalof Geophysics,1987,61:110-121.
[4]Belaval M,Lane J J,Lesmes D P,et al.Continuous-resistivityprofiling for coastal groundwater investigations:three case studies[J].SAGEEP Proceedings,Texas.2003,14.
[5]Day-lewis F D,White E A,Johnson C D,et al.Continuous resis-tivity profiling to delineate submarine groundwater discharge-ex-amples and limitations[J].The Leading Edge.2006,25(6):724-728.
[6]何继善,鲍力知.海洋电磁法研究的现状和进展[J].地球物理学进展,1999,14(1):7-39.
[7]张胜业,王水.海洋电法的发展与展望[M].北京:科学出版社,1998:28-34.
[8]王家林,吴健生,王一新.海洋工程和地质灾害调查中海洋电法研究的几点设想[C]//2000年中国地球物理学会年刊——中国地球物理学会第十六届年会论文集,2000.
[9]刘宏岳,戴一鸣.气动机械声波水域浅层地震勘探连续冲击震源装置[P].中国,200820102804.2.
[10]Anderson A L,Hampton L D.Acoustics of gas-bearing sedimentsI.Background[J].Journal of the Acoustical Society of America.1980,67(6):1865-1889.
[11]Anderson A L,Hampton L D.Acoustics of gas-bearing sediments.II.Measurements and models[J].The Journal of the AcousticalSociety of America.1980,67(6):1890-1903.
[12]阚光明,刘保华,张维冈,等.珠江口外伶仃洋海底含气沉积物声波反射及衰减特征[J].海洋学报(中文版),2008,(2):26-32.
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