Dissertation > Excellent graduate degree dissertation topics show

Study on Cross-well Seismic Computerized Tomography and Its Applications in Covered Karst Prospecting

Author: LuoWenZuo
Tutor: ZhuZiQiang
School: Central South University
Course: Earth Exploration and Information Technology
Keywords: Karst exploration computerized tomography improved model residual error
CLC: P631.4
Type: Master's thesis
Year: 2011
Downloads: 72
Quote: 0
Read: Download Dissertation

Abstract


Expressway construction in karst developing area, we need exact information of karst. Cross-well seismic computerized tomography is a geophysical exploration method, which use seismic wave to explore the media between wells. It can provide high resolution image of the target.LTI and SIRT are widely used in computerized tomography, as the travel-time tomography between wells is a nonlinear inverse problem which is solved by a series of linearization iterative steps, this problem is usually ill-posed. To achieve a better inversion result, we can start from two aspects:first, giving a better initial model; second, giving a better distribution method for residual errors. The first arrival time which measured in the receive well should be related to slowness field, so we can establish a better initial model after making full use of the first arrival time. When seeking the correction value of the grid in SIRT method, we get the average value of the correction values of the rays which passing through the grid, the average distribution of residual errors makes the convergence of the SIRT method is easy from a mathematical point of view, but the problem of average is usually covered up details, because the same grid has different effect on each ray actually, conversely, the correction value of each ray should not be averaged distributed to each grid. Improved algorithm proposed in this paper is better than the original algorithm by the numerical modeling experiment, the different values of threshold、magnification、weight coefficient in improved algorithm have great influence on the result of CT. Generally, the threshold is relatively large, the magnification value is relatively small, the weight coefficient is also relatively small when the model is complex.Improved algorithm proposed in this paper is used in the exploration of bridge in GUGANG exchange for DA-LIU Expressway, we achieve better results.

Related Dissertations

  1. Diagnose and Therapy of Obturator Hernia,R656.2
  2. Application of Interpolation in CT Tomography Reconstruction,TP391.41
  3. The Wavelet Neural Network Blind Equalization Algorithm Based on Fuzzy Neural Network Controlling,TP273.4
  4. Blind Equalization Algorithms Based on Coordnate Transformation and DSP Simulation,TN911.5
  5. Parameter optimization method and the residual correction method in the prediction model optimization,C934
  6. Correction of Incidence Effection and Mirror Reflection Exception on Multibeam Sonar Image,P229
  7. High Frequency Endoscopic Ultrasound Mini Probe Versus Multislice Spiral Computed Tomography for Preoperative T-Staging of Gastric Cancer,R735.2
  8. Several Problems in Computerized Tomography with a Discontinuous Solution,TP391.41
  9. Pancreatic Duct Adenocarcinoma and Mass-forming Focal Pancreatitis: the Retrospective Research of Their Morphological Performance and the Study of Their Water/Fat Content,R735.9
  10. Beneficial Effect of Postconditioning Treatment on Ischemia Reperfusion Injury in Primary Patients with Acute St-segment Elevation Acute Myocardial Infarction,R542.22
  11. Research and Application of Ultrasonic CT Technology on Non-destructive Testing of Concrete,TU755.7
  12. Analysis of the Risk Factors and the Clinical Characteristic on Subcortical Arteriosclerotic Encepholopathy,R749.13
  13. Application of CT Perfusion Imaging and CT Angiography in Diagnosis of Transient Ischemic Attack of Internal Carotid Artery System,R743.3
  14. The Use of 3-Dimensonal Reconstructions to Evaluate the Anatomic Relationship of the Inferior Alveolar Nerve and Mandible,R783.6
  15. Therapeutic Evaluation of Intravascular Stenting in Ischemic Cerebral Vascular Diseases by SPECT Perfusion Imaging,R743.3
  16. Application of CT Perfusion Imaging and CT Angiography in Diagnosis of Vertebrobasilar Insufficiency,R743.3
  17. Clinical Study on Renal Angiomyolipoma,R737.11
  18. Study on Time and Frequency Transfer Using GPS Carrier Phase,P228.4
  19. Study of Water Disaster Detection Experiment with Resistivity Tomography Method in the Working Face,TD745
  20. Pile of concrete sonic transmission method test,TU473.16
  21. The Clinical and Pathologic Mechanism Study of Orbital Cavernous Hemangioma,R739.7

CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Seismic exploration
© 2012 www.DissertationTopic.Net  Mobile