Seismic Record Simulation of the Coalbed in HTI Media

2011 ◽  
Vol 393-395 ◽  
pp. 935-938
Author(s):  
Yi Chen Zhao ◽  
Hui Wang ◽  
Yan Sun
Keyword(s):  
Coal Seam ◽  
Wave Field ◽  
Single Shot ◽  
Fracture Detection ◽  
Seismic Record ◽  
Element Simulation ◽  
Hti Media ◽  
Component Wave ◽  
Anisotropic Elastic ◽  
Hti Medium

This paper uses the finite element simulation system of the anisotropic elastic wave to simulate the two component wave field characteristics of the HTI medium in the coal-seam with fractures. The simulation results of the single shot record indicate that when the coal-seam contains fracture. The wave field characteristics under different fracture parameters are observed through the single shot record. The influences can be found mainly in the energy and amplitude vers offset characteristics. The characteristics of x component and z component are different. This may provide some experimental references to fracture detection using the PS-wave.

Simulating the Fracture Wave Field Characteristics Using Finite Element Method of the Anisotropic Elastic Wave

2011 ◽  
Vol 109 ◽  
pp. 244-247
Author(s):  
De Yi Yang
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Elastic Wave ◽  
Wave Field ◽  
Model Theory ◽  
Fracture Detection ◽  
Important Sense ◽  
Anisotropic Elastic ◽  
Element Method

This paper introduced the Liner slip deformation (LSD) fracture media model theory, and this theory is applied into the two component numerical simulation in HTI(LSD) media using the finite element method of the anisotropic elastic wave. By means of the numerical simulation paper revealed the wave field characteristics of the fracture parameters. The conclusion has an important sense for the application of the LSD fracture media model theory in the field of fracture detection and detection of fracture containing fluid.

Wave Field Characteristics of Small Faults around the Loose Circle of Rock Surrounding a Coal Roadway

2020 ◽  
Vol 25 (2) ◽  
pp. 245-254 ◽  
Author(s):  
Bo Wang ◽  
Huachao Sun ◽  
Lanying Huang ◽  
Shengdong Liu ◽  
Biao Jin ◽  
...  
Keyword(s):  
Coal Seam ◽  
Wave Field ◽  
Love Wave ◽  
The Body ◽  
Body Waves ◽  
Seismic Record ◽  
Coal Roadway ◽  
Geological Conditions ◽  
Small Fault ◽  
Channel Wave

The geological conditions of coal roadway excavation are complicated. Seismic advanced detection is strongly influenced by the loose circle of fractured rock surrounding the competent coal seam. However, the three-dimensional wave field characteristics of small fault advanced detection in the condition of the loose circle of coal roadway have not examined. In this paper, numerical modeling and field tests were conducted to address this knowledge gap. The results indicate that when a seismic source near the tunnel face is excited, the body waves and a Love channel wave propagate in the tunneling direction toward the small fault, then produces reflected body waves whose amplitude is relatively weak, and a reflected Love channel wave whose amplitude is relatively strong. When reflected body waves and the reflected Love channel wave enter the loose circle of surrounding rock, the former's signal is unrecognizable in seismic record; but the latter converts to a Love wave whose amplitude is strong in the loose circle of coal seam. The Love wave which has a large interval from other wave trains in the time domain is easily recognizable in seismic record, which makes it suitable for advanced detection of small fault. The signal-to-noise ratio of seismic record of X component is higher than those of Y component and Z component.

Preliminary study on wave field and dispersion characteristics of channel waves in VTI coal seam media

2019 ◽  
Vol 67 (5) ◽  
pp. 1379-1390
Author(s):  
Guangzhong Ji ◽  
Hui Li ◽  
Jiuchuan Wei ◽  
Sitong Yang
Keyword(s):  
Coal Seam ◽  
Wave Field ◽  
Dispersion Characteristics ◽  
Preliminary Study

scholarly journals Study of the influence of anisotropy parameters on reflection coefficients from a boundary between two azimuthally anisotropic media

2020 ◽  
pp. 18-29
Author(s):  
G. A. Dugarov ◽  
R. K. Bekrenev ◽  
T. V. Nefedkina
Keyword(s):  
Significant Influence ◽  
Anisotropic Media ◽  
Elastic Parameter ◽  
Media Analysis ◽  
Reflection Coefficients ◽  
Reflection Data ◽  
Hti Media ◽  
Target Layer ◽  
Anisotropy Parameters ◽  
Hti Medium

The paper considers an algorithm for calculating reflection coefficients from boundary between two HTI media. Analysis of the presence of anisotropy above and below the target boundary, as well as variations in the parameters of HTI media, was done. Interpretation of reflection data from the boundary between two HTI media with neglect of anisotropy above or below potentially leads to significant errors in estimation of symmetry axes directions, and hence fracturing orientation. Overestimation/underestimation of an elastic parameter in the overlying HTI medium could lead to a corresponding overestimation/underestimation of similar parameter in the underlying target layer in the result of AVAZ inversion. Furthermore, among the anisotropy parameters Thomsen parameter γ has most significant influence on the reflection coefficients dependences. Thus, the parameter γ could be used foremost as a result of the AVAZ inversion.

Study on Mountainous Shallow-Buried Coal Seam Mining Working Face Strata Behaviors and Overlying Strata Movement Features

2011 ◽  
Vol 121-126 ◽  
pp. 2911-2916
Author(s):  
Guo Lei Liu ◽  
Ke Gong Fan ◽  
Tong Qiang Xiao
Keyword(s):  
Coal Seam ◽  
Horizontal Displacement ◽  
Simulation Software ◽  
High Rate ◽  
Strata Movement ◽  
Working Face ◽  
Element Simulation ◽  
Valve Opening ◽  
Seam Mining ◽  
Overlying Strata

Through testing the mountainous shallow-buried coal seam mining working face strata behaviors in Faer mine field, it got the strata behaviors: it was of large roof pressure, high rate of safety valve opening in hydraulic support, and even some supports crushed or took separation between top beams and tail beams. Traditional method of calculating supports’ resistance can not be applied to mountainous shallow-buried coal seam mining working face. With the discrete element simulation software UDEC it analyzed the strata movement feature, and got that the overlying strata took collapse and horizontal displacement after mountainous shallow-buried coal seam mined, and the strata movement feature was different between reverse slope mining and positive slope mining.

A STUDY ON SHEAR WAVE VELOCITY ESTIMATION AND FRACTURE DETECTION IN HTI MEDIA

2002 ◽  
Vol 10 (03) ◽  
pp. 331-347 ◽  
Author(s):  
QIZHEN DU ◽  
HUIZHU YANG ◽  
YUAN DONG
Keyword(s):  
Wave Velocity ◽  
Joint Inversion ◽  
Fractured Reservoirs ◽  
Transverse Isotropy ◽  
Crack Density ◽  
Velocity Estimation ◽  
Fracture Detection ◽  
S Wave ◽  
S Waves ◽  
Hti Media

The paper presents estimates of the S-wave velocity and the crack density at which fractured reservoirs begin to play an important role in oil exploration. Transverse isotropy with a horizontal axis of symmetry (HTI) is the simplest azimuthally anisotropic model used to describe fractured reservoirs that contain parallel vertical cracks. A double profile concept is used to develop an equation for the P-S wave normal-moveout (NMO) velocity. The azimuthal NMO velocities of the P- and P-S waves can then be used to estimate the velocities of the S-waves and Thomsen's coefficient, γ. For multilayered media, a recursive equation is developed for the NMO velocity in each layer. The numerical results indicate that the S-wave NMO velocity can be accurately estimated using the P- and P-S wave NMO velocities in HTI media. An important parameter of fracture systems that can be measured from seismic data is the crack density which can be estimated using the NMO velocities of the P- and S-waves from horizontal reflectors. Therefore, fractures can be completely characterized by the joint inversion of P-waves and converted P-S waves in HTI media.

Sign in / Sign up

Export Citation Format

Share Document