Inverse borehole coupling filters and their applications

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:80186

Peng, C ^[1]

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1. Massachusetts Inst. of Technology, Cambridge, MA (United States)

This paper describes a new procedure for processing VSP and crosswell data acquired using an array of hydrophone. The procedure consists of three steps. In the first step the authors apply an inverse borehole coupling equation to convert hydrophone pressure data into borehole squeeze pressure data, by which the tube waves are significantly attenuated and the P-wave and S-wave are partially compensated for the borehole effects. In the second step, they make use of a partial differential equation that relates the borehole squeeze pressure to the pressure of the incident P-wave. In the third step, they show that one can also map the hydrophone pressure data into the geophone response, provided that both the P-wave and S-wave velocity profiles along the borehole are known. Several synthetic examples are used to demonstrate its accuracy. The Kent Cliffs hydrophone data are successfully processed using the above steps, and the data quality is found to be significantly improved.

• DOE Contract Number: FG02-86ER13636
• OSTI ID: 80186
• Report Number(s): CONF-941015--
• Country of Publication: United States
• Language: English

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