Estimation of 3D borehole acoustic rock properties using a new modular sonic tool

V. Pistre, T. Plona, B. Sinha, T. Kinoshita, H. Tashiro, T. Ikegami, J. Pabon, S. Zeroug, R. Shenoy, T. Habashy, H. Sugiyama, A. Saito, C. Chang, D. Johnson, H. P. Valero, C. J. Hsu, S. Bose, H. Hori, C. Wang, T. EndoH. Yamamoto, K. Schilling

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

A comprehensive mechanical characterization of the wellbore rock relies on a three-dimensional (3D) characterization of the compressional and shear slowness in terms of their radial, azimuthal, and axial variations. These rock property variations arise because of non-uniform stress distributions, mechanical or chemical near-wellbore alteration due to the drilling process and formation intrinsic anisotropy in shales. The critical data required to invert for these parameters is derived from broadband dispersion curves of propagating borehole acoustic modes. The new modular sonic tool incorporates improved monopole and cross-dipole transmitter technology while featuring an extensive receiver array incorporating 13 axial levels of 8 azimuthal sensors each. Each receiver is individually digitized resulting in 104 waveforms leading to a more reliable and accurate slowness estimation than with the previous technologies. This comes about in particular through improved borehole mode extraction/rejection and enhanced wavenumber resolution at all frequencies. In this paper, we highlight unique features of this new tool that have an important impact on seismic and borehole seismic problems. The high quality waveforms and advanced processing techniques lead to improved compressional and shear slowness estimates, radial profiling of shear and compressional slowness, enhanced anisotropy detection and mechanism identification, and reliable through casing slowness measurements. Examples are shown from various wells around the world.

Original languageEnglish
Title of host publication67th European Association of Geoscientists and Engineers, EAGE Conference and Exhibition, incorporating SPE EUROPEC 2005 - Extended Abstracts
PublisherSociety of Petroleum Engineers
Pages2029-2032
Number of pages4
ISBN (Print)9073781981, 9789073781986
Publication statusPublished - 2005 Jan 1
Event67th European Association of Geoscientists and Engineers, EAGE Conference and Exhibition, incorporating SPE EUROPEC 2005 - Extended Abstracts - Feria de Madrid, Spain
Duration: 2005 Jun 132005 Jun 16

Publication series

Name67th European Association of Geoscientists and Engineers, EAGE Conference and Exhibition, incorporating SPE EUROPE2005 - Extended Abstracts
Volume67th European Association of Geoscientists and Engineers Conf...

Other

Other67th European Association of Geoscientists and Engineers, EAGE Conference and Exhibition, incorporating SPE EUROPEC 2005 - Extended Abstracts
CountrySpain
CityFeria de Madrid
Period05-06-1305-06-16

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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