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Study on Ellipse Evolving Imaging Method

Author: ZhangHuanLan
Tutor: ZhuGuangMing
School: Chang'an University
Course: Solid Earth Physics
Keywords: Imaging Ellipse evolving Zero-offset section Common reflection point irregular surface
CLC: P631.4
Type: Master's thesis
Year: 2009
Downloads: 39
Quote: 2
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Abstract


We can get correct subsurface image for strata-media using conventional CMP stack imaging method. But if there exists complex structure, such as dipping reflectors , including in the subsurface, image that is imaged by conventional CMP stack method would depart from true subsurface structure, and then post-stack migration is necessary to move dipping reflectors into their true subsurface positions. If geological structure is more complex, stacked section cannot be treated as zero-offset section, CMP stack+post-stack-migration imaging method doesn’t work, then we must find another method that could image better, ellipse evolving imaging method (PRO) is just a method that can be work when the subsurface strata have dipping reflectors.Ellipse evolving imaging method (PRO) has no constraints on the surface and subsurface. Even there exist dipping reflectors in the subsurface, ellipse evolving imaging method can also realize real common reflection point stack, at the same time, it can obtain velocity that reflects real velocity of subsurface stratum using velocity analogy ,the velocity has no relation with stratum obliquity. During the processing of the real seismic data, ellipse evolving imaging method can instead of CMP stack, and the stacking image section can be used to post-stack-migration.In this dissertation, the principle of ellipse evolving imaging method is described in detail, the formulas of ellipse evolving imaging method in plane surface are deduced. And the formulas of ellipse evolving imaging method in irregular surface is deduced based on the ideal of coordinate rotation and translation. Furthermore, the impact of parameters such as velocity, datum in this imaging method is discussed. The programs of ellipse evolving imaging method in the both cases are implemented using VC++. At last, a variety of geological models such as dipping reflector, syncline anticline and fault are designed and forwarded to proof the method.

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