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Methods of generating synthetic acoustic logs from resistivity logs for gas-hydrate-bearing sediments

Bulletin 2170

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Abstract

Methods of predicting acoustic logs from resistivity logs for hydrate-bearing sediments are presented. Modified time average equations derived from the weighted equation provide a means of relating the velocity of the sediment to the resistivity of the sediment. These methods can be used to transform resistivity logs into acoustic logs with or without using the gas hydrate concentration in the pore space. All the parameters except the unconsolidation constants, necessary for the prediction of acoustic log from resistivity log, can be estimated from a cross plot of resistivity versus porosity values. Unconsolidation constants in equations may be assumed without rendering significant errors in the prediction. These methods were applied to the acoustic and resistivity logs acquired at the Mallik 2L-38 gas hydrate research well drilled at the Mackenzie Delta, northern Canada. The results indicate that the proposed method is simple and accurate.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Methods of generating synthetic acoustic logs from resistivity logs for gas-hydrate-bearing sediments
Series title:
Bulletin
Series number:
2170
Edition:
Version 1.0
Year Published:
1999
Language:
ENGLISH
Publisher:
U.S. Dept. of the Interior, U.S. Geological Survey,
Description:
11 p.