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Common Shot Gather Velocity Analysis Based on the Elliptic Development Method

Author: MengYang
Tutor: MengXiaoHong
School: Chinese Geology University (Beijing)
Course: Earth Exploration and Information Technology
Keywords: Oval Expand Common- law spectrum to the exit point speed Rms velocity Zero -offset section Common shot gathers
CLC: P631.4
Type: Master's thesis
Year: 2011
Downloads: 33
Quote: 0
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Abstract


Zero-offset section occupies an important position in the seismic data processing and quality control, interpretation and inversion of the various stages, is a very important intermediate outcomes. Zero-offset section a lot, this article briefly According to previous studies, several major acquisition zero offset from the section (CMP dynamic correction superimposed inclination moveout stack prestack migration and common reflection surface stack), pointed out their respective roles and strengths and weaknesses. Ellipse drawn on this basis to expand the superimposing method. The elliptical expand superposition method has a certain degree of particularity and novelty. It abandons the set and dynamic correction superimposed thinking of the traditional CMP pumping Road, starting from the ray theory, signal oval commence strike the accurate stacking velocity stack imaging technology and the envelope of the interference in the superposition process. Under the local coverage for the homogeneous medium, regardless of how the shape of the interface of the subsurface reflection elliptical Expand method strike speed is the true velocity of the medium, and the obtained stack sections is a true zero-offset section. Conventional common midpoint (CMP) of superimposed imaging method for horizontal strata able to get a good image of the underground, but local tilted strata underground imaging method CMP stacking image deviated from the true position, then We need for poststack offset such that the homing of the reflective layer to the correct location. Stack section and zero offset from the profile very different, NMO superimposed poststack migration can not get an accurate image of the subsurface, then we will seek another and better imaging methods, oval expand into local layer structure is complex, Act (PRO) is a tilt of the underground strata accurate imaging method. Oval expansion theory, this paper proposes a method based on the speed of common shot gathers data analysis, given the velocity analysis process; oval expand the selected speed range, and coherent superposition method, the use of common shot gathers strike each speed zero-offset from the stack section;, in accordance with the maximum energy criterion to determine the speed of each normal exit point of the zero-offset stacked section to form an election row total spectrum to the exit point speed; then picked up speed to strike a true zero-offset from the stack section. The velocity analysis method without pre-extraction speed analysis gathers to avoid the conventional velocity analysis of the Chinese Communists reflection point dispersion problems. The model spreadsheet shows the correctness and validity of the method.

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Seismic exploration
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