1887

Abstract

Theoretical evaluation of elastic impedance (EI) and ray impedance (RI) has revealed that RI has a more reliable dimension and is less sensitive to errors than EI. In particular, RI appears to be more applicable than EI for characterizing tight gas sands. In this paper, a new measurement (RI) is proposed to estimate the ray impedance from elastic impedance, and can be expressed in the form of a normalization of the elastic impedance (EI). Tests of these three measurements are performed on the log data of three different types of reservoirs: a typical Class III marine gas sand, a Class I tight gas-sand and a thin sand-mud inter-bed. We show that RI is capable of characterizing all three types of reservoirs, whilst EI fails in the tight gas-sand case. The cross-plots of EI against acoustic impedance (AI) show approximately linear trends for all three cases. The RI estimated from the elastic impedance (EI) has a comparable dimension to the acoustic impedance (AI), and maintains the interpretation ability of the original RI.

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/content/papers/10.3997/2214-4609.20149300
2011-05-23
2024-03-28
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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20149300
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