低速带

常规的（基于折射波到达时或者微测井等）方法在复杂近地表条件下很难求得正确的低速带速度和静校正量。

Conventional methods that are on basis of refraction arrival time or microlog cannot yield proper LVZ velocity or static quantities in areas with complex near surface conditions .

通过理论记录说明低速带速度、厚度横向变化对时深转换的影响，当低速带结构横向变化较大时，叠加速度也随着变化，故时深转换必须考虑低速带对叠加速度的影响。

The influence of LVZ velocity and lateral change of thickness on time-to-depth inversion was described by theoretical records , the stack velocities also change when the lateral structures of LVZ have larger variation , so the influence of LVZ on stack velocities should be considered in time-to-depth inversion .

软流圈，大体上相当于低速带。

The asthenosphere corresponds approximately to the low-velocity zone .

不同的是，低Q值条带深度范围比低速带的更大一些。

The difference is that the low Q zones have a wider range than the low velocity zones .

阐明当前常用的两步法静校正中的RG值代表等效低速带相对固定基准面的静校正量；

Expounded that the RG values in common-used two-step static corrections method represents the statics of relatively fixed datum in equivalent LVZ ;

对地震数据应用静校正高频分量后，t0零点对应于等效低速带的顶界面；

The zero point of t 0 value corresponds to top interface of equivalent LVZ after application of the high-frequency components of statics to seismic data ;

为此在联合采集纵横波资料前，我们在工区做了SH波浅层折射勘探。利用SH波折射资料可以求出低速带速度和厚度。

For this reason , shallow refraction survey with SH waves has been conducted prior to the combined acquisition of the compressional and shear waves and the velocity and thickness of the low velocity zone are obtained from the SH-wave refraction data .

结果表明，横贯南极山脉地壳厚度约为45km，55～75km之间存在明显低速带，它预示着这一深度有熔融的岩浆存在。

Our result shows that crust thickness of transantarctic mountains is 45 km . In depth of 55 ~ 75 km there are clear layers of low velocity . It displays deep fused magma .

反演含有低速带的上地幔速度结构的一个公式

An inversion formula for a mantle structure with low velocity zone

软流层或低速带就是幔汁集中层。

The asthenosphere or low-velocity layer is a HACONS-fluid-concentrated layer .

低速带校正的一种途径&SH波浅层折射勘探

An approach to the correction of low velocity zones : SH-wave shallow refraction survey

近地表低速带参数反演

Inversion of near surface low velocity zone parameter

震源深度对低速带区地震波传播特征的影响

The Effect of Source Depth on the Characteristics of Seismic Wave Propagation of Weathering Area

要做好低速带校正，首先要求取低速带的速度和厚度。

The key to statics is to know the velocity and thickness of the low velocity zone .

获得了低速带的纵横波速度，低速带的高程以及低速带的层厚度。

P-wave and S-wave velocities , elevations , and layer thickness of the low velocity zone are derived .

如果条件允许，最好将检波器也埋置到低速带以下。

If the condition is allowable , the best way is to bury the geophone beneath the weathering belt .

阐明利用瑞雷面波反演近地表速度和厚度的可行性，并利用地震记录中的瑞雷面波数据，反演近地表低速带的厚度和速度。

Rayleigh surface wave data in seismic exploration is used to inverse near surface low velocity zone thickness and velocity .

速度较低的紧靠物体表面的流体层。软流圈，大体上相当于低速带。

The layer of slower flow of a fluid past a surface . The asthenosphere corresponds approximately to the low-velocity zone .

提出一种利用折射初至反演低速带的结构来进行长波长静校正的有效方法。

Authors put forward an effective method which achieves long-wavelength static correction by deriving the low-velocity layer structure from refraction first breaks .

理论模型试验结果表明利用层析成像技术可由初至波的到达时反演表层低速带速度并求得静校正量。

This paper presents an approach that derives LVZ velocity and static correction values from the arrival time of first break by using tomography technology .

在复杂地区进行煤田地震勘探，受低速带变化剧烈、倾角大及构造复杂等因素影响，依靠经验设计的观测系统往往存在较大缺陷。

Besides , for ad hoc complex topography , to use block observation system design of Klseis system is advised to make-up deficiency from regular observation system .

在此浮动基准面上求取的叠加速度仅取决于低速带底板下伏介质的速度，而与地形、低速带无关。

The stack velocity calculated on the floating datum depends on the velocity of medium underlying the low velocity layer and is independent of topography and low velocity layer .

通过统计分析发现沟槽板湍流边界层中无量纲低速带条间距及无量纲高速带条间距均符合对数正态分布。

The statistical analysis indicates that , for the turbulent boundary layer flow over riblets surfaces , both the non dimensional low speed streaks and the non dimensional high speed streaks obey the normal log distribution .

井间地震由于具有多波接收、高精度、高分辨率、能量传播距离短、接近探测目标、避开低速带等一系列优点，在工程中得到了越来越广泛的应用。

Cross-hole seismic has been applied in project extensively because of many advantages , such as multi-wave receiving , high accuracy , high resolution , short of energy propagation length , approach detecting object , avoiding low speed zones .

上地壳的深大断裂在地下深处常常伴有几百米至几千米宽的低速带，它对油气的储集和运移或对储层的破环起着重要的控制作用。

The deep and large faults in upper crust are often accompanied with low velocity layer stretching from several hundreds meters to several thousands meters in deep underground , which plays an important controlling role in hydrocarbon accumulation and migration or wreck of reservoir .

具体表现为小折射排列长度太小（当低速带厚度较大时，无法追踪到高速层顶界面）、小折射资料的解释算法不合适及微测井深度明显不够。

The concrete shows are that the spread length of shallow refraction is too short to trace the top interface of high-velocity bed when the thickness of low velocity layer is large , inadequate interpretation algorithm of shallow refraction data and insufficient depth of uphole survey .

通过建立处理项目对采集工程项目、基准面、替换速度、低速带控制点、表层模型、时深曲线的关联，以及与其它处理项目间的关联，提供了一套完整可靠的区域闭合控制手段。

By means of building the conjunction of processing project to gathering project , datum , replacement velocity , controlling points of low velocity layer , surface model and T-D curve , and to the other processing projects , a reliable set of regional closure controlling method is put forward .

三维反演得到的速度结构结果表明，在地下12km以下存在一条北北东向和一条北北西向的低速条带。

Velocity structure obtained from 3-D inversion suggests that there exist two low velocity zones , one trending NNE and the other NNW , below the depth of 12 km .

在90km深度的横剖面上，由缅甸的密支那至越南的洞海的低速条带，可能与红河断裂带有关；

In the horizontal profile at the depth 90 km , a low velocity stripe from Myitkyina , Myanmar to Donghai , Vietnam seems to be related to Honghe fault belt .

从100km至250km深，在东亚东部及西太平洋边缘海，自北向南显示出一条宽约2500km~4000km，长约8000km的巨型低速异常带。

From depth of 100 km to 250 km , a giant low velocities belt within the width about 250 km to 400 km and length about 8000 km are showed in the eastern part of East Asia and West Pacific marginal sea .