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地球物理勘查方法在水文地质工程中的应用
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作者 翟福勤 《科学与信息化》 2022年第15期78-80,共3页
地球物理勘查法简称物探,以各种岩石和矿石密度、弹性、电性、磁性等物理性质的差异为研究基础,用不同物理方法和仪器,探测天然或人工地球物理场的变化,由此得出物探资料来推断、解释地质构造和矿产分布情况。本文探讨当前水文地质工程... 地球物理勘查法简称物探,以各种岩石和矿石密度、弹性、电性、磁性等物理性质的差异为研究基础,用不同物理方法和仪器,探测天然或人工地球物理场的变化,由此得出物探资料来推断、解释地质构造和矿产分布情况。本文探讨当前水文地质工程中常用的地球物理勘察方法原理、特点等,以某工程为例探讨高密度电法、浅层地震波反射波法等应用,指出应综合地质资料分析勘察结果并对不同勘察方法结果相互印证,以提高检测结果可靠性。 展开更多
关键词 水文地质工程 高密度电法 探地雷达 浅层地震波反射波
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Forward Modeling of the Relationship Between Reflection Coefficient and Incident Angle of the P Wave in a Coal Seam 被引量:12
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作者 DONG Shou-Hua YUE Jian-hua 《Journal of China University of Mining and Technology》 EI 2006年第1期5-7,12,共4页
Although the Zoeppritz equation is suitable for a single interface in a thick deposit, it has some limitations for composite reflection waves from both the floor and the roof of coal seams. Based on the ray model, the... Although the Zoeppritz equation is suitable for a single interface in a thick deposit, it has some limitations for composite reflection waves from both the floor and the roof of coal seams. Based on the ray model, the relationship of the overall reflection coefficient of composite reflection P waves, from coal seam versus incidence angle (AVO), is dis- cussed. The result shows that: 1) the overall reflection coefficient of composite reflection waves from coal seams is a negative value and is determined mainly by the lithology of roof and floor, which is different from the reflection coeffi- cient of a single interface; 2) if the incidence angle ranges from 0° to 6°, the reflection coefficient of composite waves of a coal seam does not change with the incidence angle and 3) if the incidence angle ranges from 6–60° , the reflection coefficient increases monotonically. 展开更多
关键词 coal seam composite wave reflection coefficient P wave
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一种基于FPGA的时间间隔测量系统设计 被引量:1
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作者 李兴鑫 黄明 +2 位作者 李恩丞 张镇 王泽权 《工业技术创新》 2022年第4期102-108,共7页
在地质勘探工作中,震波反射波对时间间隔测量技术的要求较高。为适应山川田野等复杂地质环境的地质测量,开发具有一定便携性和测量精度的便携设备非常必要,FPGA的高集成度使得这一测量系统的实现成为可能。设计了一种基于FPGA的时间间... 在地质勘探工作中,震波反射波对时间间隔测量技术的要求较高。为适应山川田野等复杂地质环境的地质测量,开发具有一定便携性和测量精度的便携设备非常必要,FPGA的高集成度使得这一测量系统的实现成为可能。设计了一种基于FPGA的时间间隔测量系统:采用多相计数法,在Verilog语言开发环境下,利用FPGA内部集成的PLL锁相环获得精准的多相采样时钟;充分利用FPGA并行运算特点,保障系统运算能力和测量精度。系统实测验证表明:该系统结构简单、功耗小、成本低、易携带,抗干扰效果好,系统测量精度可达到±1ns,测量时间间隔的动态范围可覆盖1ns~1.2h。 展开更多
关键词 FPGA 时间间隔测量 多相计数法 震波反射波 地质勘探
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The Goos-Hnchen shift of wide-angle seismic reflection wave 被引量:1
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作者 LIU FuPing MENG XianJun +2 位作者 XIAO JiaQi WANG AnLing YANG ChangChun 《Science China Earth Sciences》 SCIE EI CAS 2012年第5期852-857,共6页
The partial derivative equations of Zoeppritz equations are established and the derivatives of each matrix entry with respect to wave vectors are derived in this paper.By solving the partial derivative equations we ob... The partial derivative equations of Zoeppritz equations are established and the derivatives of each matrix entry with respect to wave vectors are derived in this paper.By solving the partial derivative equations we obtained the partial derivatives of seismic wave reflection coefficients with respect to wave vectors,and computed the Goos-Hnchen shift for reflected P-and VS-waves.By plotting the curves of Goos-Hnchen shift,we gained some new insight into the lateral shift of seismic reflection wave.The lateral shifts are very large for glancing wave or the wave of the incidence angle near the critical angle,meaning that the seismic wave propagates a long distance along the reflection interface before returning to the first medium.For the reflection waves of incidence angles away from the critical angle,the lateral shift is in the same order of magnitude as the wavelength.The lateral shift varies significantly with different reflection interfaces.For example,the reflected P-wave has a negative shift at the reflection interface between mudstone and sandstone.The reflected VS-wave has a large lateral shift at or near the critical angle.The lateral shift of the reflected VS-wave tends to be zero when the incidence angle approaches 90°.These observations suggest that Goos-Hnchen effect has a great influence on the reflection wave of wide-angles.The correction for the error caused by Goos-Hnchen effect,therefore,should be made before seismic data processing,such as the depth migration and the normal-moveout correction.With the theoretical foundation established in this paper,we can further study the correction of Goos-Hnchen effect for the reflection wave of large incidence angle. 展开更多
关键词 Goos-Hnchen effect lateral shift P-and SV-wave reflection wave of wide-angle Zoeppritz equations critical angle
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