Common Transmission Point (CTP) Gathers: A New Domain for Amplitude Variation with Offset

Lutfi Mulyadi Surachman and Abdullatif Al-Shuhail
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Lutfi Mulyadi Surachman: Department of Geosciences, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
Abdullatif Al-Shuhail: Department of Geosciences, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia

Energies, 2022, vol. 15, issue 13, 1-13

Abstract: Analysis of amplitudes of transmitted waves (TAVO) is an extension of the conventional AVO analysis using amplitudes of reflected waves. In this study, we introduce the common transmission point (CTP) gather, which is a new domain that is convenient for TAVO analysis. A CTP gather is formed by binning traces that have the same transmission point across a layer interface. We use the proposed domain to invert the ratios Δ α α , Δ ρ ρ , Δ β β , and β α in a model consisting of a gas channel nestled within an oil reservoir. The TAVO equations are fitted to amplitudes calculated by Zoeppritz equations within CTPs inside and outside the channel. Within each CTP gather, we use all traces with incidence angles less than 90% of the critical angle (if any) as TAVO approximations break down beyond this point. The proposed CTP TAVO analysis method estimated Δ α α , Δ ρ ρ , Δ β β , and β α in the gas channel within 1% of their corresponding true values.

Keywords: converted waves; VSP survey; reservoir parameter estimation; amplitude variation with offset (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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