Abstract
This paper makes efforts to explore joint-analyzing the amplitude
versus offset phenomena in the PP and PS data with expectation to
reduce the ambiguity of AVO analysis by utilizing the redundancy
of multi-component AVO measurements. The convenient approximations
of P-P and P-S reflection coefficient are obtained, which link the
seismic data with the elastic parameters that are sensitive to the
hydrocarbon existing in the rock. A great deal of model and real
data is used to test the methods. In this paper, we derive the approximation
of PS reflection coefficient from Zoeppritz equation, correct Aki
and Richards's approximation, and derive some equations of PS reflection
coefficient possibly easy to be used in PS AVO analysis. We study
the laboratory and well logging results, and show the difference
between bulk modulus (k) and rigidity or shear modulus (m) is influenced
by fluid-fill more purely, and it is a sensitive and quantitative
indicator of gas existing. P-P and P-S reflection coefficient equations
are expressed with the elasticparameters (lambda and mu, or kappa
and mu) in the paper. And it is shown by the well log that this kind
of expression magnify the changes embedded in the Vp and is advantageous
to extract the anomaly caused by fluid-fill. The method to extract
the zero offset section or approximate normal incidence section is
present in the paper. The method in this paper is based on the PP
reflection coefficient with only care on constant term independent
of incident angles.
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