We have developed a case study of crosshole seismic tomography with a cross-firing geometry in which seismic sources were placed in two vertical boreholes alternatingly and receiver arrays were placed in another vertical borehole. There are two crosshole seismic data sets in a conventional sense. These two data sets are used jointly in seismic tomography. Because the local sediment is dominated...

north-east khorasan is one of the most active regions in the world because of is setting on the alpine-himalayan belt. historical and geological backgrounds suggest that this region has experienced many destructive earthquakes throughout history. compared with the historical background, the seismicity of the region, in the present century, is better known both from the macroseismic and instrume...

I grant The Pennsylvania State University the non-exclusive right to use this work for the University's own purposes and to make single copies of the work available to the public on a not-for-profit basis if copies are not otherwise available. ______________________ Tin-Wai Lee iii ABSTRACT Time-lapse (4D) inversion is a stand-alone method that does not require prior time-lapse seismic processi...

Abstract This article investigates bypassing the inversion steps involved in a standard litho-type classification pipeline and performing directly from imaged seismic data. We consider set of deep learning methods that map data into classes, trained on two variants synthetic data: (i) one which we image using local Radon transform to obtain angle gathers, (ii) another start subsurface-offset ba...

In crosswell seismic experiments, seismic sources are red in one well, and the waveeelds generated are measured in another well. The goal of the crosswell seismology is to nd physical parameters, especially the velocities, of the rocks between the wells from these measurements. This amounts to the mathematical problem of solving a coeecient inverse problem of the multidimensional acoustic wave ...

Finite difference is a simple, fast and effective numerical method for seismic wave modeling, and has been widely used in forward waveform inversion and reverse time migration. However, intensive calculation of three-dimensional seismic forward modeling has been restricting the industrial application of 3D pre-stack reverse time migration and inversion. Aiming at this problem, in this paper, a ...

INTRODUCTION Problem of reservoir estimation. The optimal exploitation of hydrocarbon reservoirs requires the accurate estimation of the reservoir's characteristics. Placement of wells, injection of gas and water, and production rate of hydrocarbons depend on the correct assessment of the reservoir properties. Furthermore, the field's properties change over tim e as reservoir pore fluid is remo...

State-of-the-art seismic imaging techniques treat inversion tasks such as full-waveform (FWI) and least-squares reverse time migration (LSRTM) partial differential equation-constrained optimization problems. Due to the large-scale nature, gradient-based algorithms are preferred in practice update model iteratively. Higher-order methods converge fewer iterations but often require higher computat...