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Methodology of Prestack Joint Inversion Based on Muti-component Surface Seismic Data

Author: YangWenBo
Tutor: WuGuoChen
School: China University of Petroleum
Course: Earth Exploration and Information Technology
Keywords: Zoeppritz equation Joint inversion Multi-component seismic PP wave PS waves
CLC: P631.4
Type: Master's thesis
Year: 2010
Downloads: 166
Quote: 1
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Abstract


The oil and gas exploration from structural reservoir steering reservoir, seismic exploration play an increasingly important role as the most effective oil and gas exploration and geophysical methods. Seismic data contains rich lithology, physical properties and fluid information can be obtained through a variety of seismic inversion methods provide richer information for the reservoir, especially high-precision complex lithology reservoir prediction and description. AVO inversion is to extract hidden in lithology parameters of seismic information. The traditional AVO inversion method is usually based on prestack P-wave data to estimate the parameters of two-parameter or three-parameter equation, determined by inversion of S-wave and density information reservoir types with fluid recognition. With the increasing use of longitudinal wave prestack research prestack converted wave and two joint inversion, so that is very conducive to improve the stability of the inversion, and enhance the accuracy of the interpretation. Reflected longitudinal wave and converted shear wave data treated prestack exploration techniques based on the current rise of multi-component joint inversion to obtain three elastic parameters of the formation rock: longitudinal wave impedance, shear wave impedance and density. These elastic parameters information, you can help us a the reservoir prediction with fluid identification. Prestack reflected longitudinal wave and converted shear joint inversion of traditional prestack reflected compressional wave inversion compared to obtain more precise parameters of the S-wave impedance and density estimates. The joint inversion achieve: first at each sampling point, the approximate formula Zoeppritz equation approximation in the least squares sense prestack CMP gathers reflected longitudinal wave and converted shear wave CCP gathers reflection amplitude values, obtained three The model parameters (and S-wave impedance and density) of the band-limited reflection coefficient road, and then integration of the reflection coefficient of the model parameters, while compensating for the low-frequency component obtained from the logging data obtained to invert the model parameter values. Seismic inversion problems inherent ill-posedness. AVO three-parameter linear inversion equation is morbid, the use of damping singular value decomposition method can improve the stability of the inversion adding damping factor for solving the model parameter values ??that accurately converted shear wave reflected compressional wave can increase the density inversion sex. Reflected longitudinal wave controlled longitudinal wave impedance estimates, using reflected shear alone the inversion can get better longitudinal wave impedance estimates; converted shear wave data control shear wave impedance and density inversion results, a separate converted shear wave data pre-stack inversion can get A better estimate of the shear wave impedance and density. The longitudinal wave and converted shear wave data in the joint inversion can get better and S-wave impedance and density estimates.

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