Integrated study of shear wave and resistivity anisotropy in an inclined well providing insight to the geomechanical model

Saikat Das, Tingting Zhang, Valsan Vevakanandan, Mohd. Helmi Abd. Rahim

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

Abstract

Understanding in-situ stress orientations and magnitudes is critical in building a geomechanical model which helps in planning and execution of a development and production programme for any hydrocarbon reservoirs. The azimuthal anisotropy analysis from cross-dipole acoustic data is commonly used to derive the direction of maximum-horizontal stress. However, the interpretation of the stress orientation is challenging in inclined wells where anisotropy may also be influenced by the relative angle of bedding plane to the bore hole. Integration of the data becomes of paramount importance to correctly interpret the stress distribution. Cross dipole wireline acoustic, 3D resistivity and 6 arm calliper data were acquired in a deviated well, offshore, Malaysia. Acoustic data was processed for azimuthal anisotropy, 3D-resistivity data was processed for formation dip, azimuth, horizontal and vertical resistivity and 6 arm calliper data was used to generate borehole shape. Acoustic analysis provided the difference in fast and slow shear wave velocities and the azimuth of fast shear. The resistivity anisotropy, dip and azimuth and bore hole shape information was incorporated to interpret effect of the dipping bed in the scheme of relating acoustic anisotropy to the formation stress. Meaningful difference in the fast and slow shear velocities (in two orthogonal direction) is observed in this well. The fast shear wave azimuth of NW-SE is consistent with the regional trend. However, the presence of laminated shale interval in the inclined bore hole imparts uncertainty in relating the anisotropy to the stress field. The formation dip and azimuth obtained from the resistivity anisotropy provided the framework of the interpretation by identifying the intervals with higher relative dip and the associated anisotropy perceived by it. Bore hole ovalization also provides the necessary input to the interpretation scheme which is supported by the existing field wide geomechanical model. Integrating all datasets resolved potentially ambiguous interpretation of the source of azimuthal acoustic anisotropy. This approach determines the cause of the anisotropy (unbalanced stress in formation vs. dipping beds and shale transverse anisotropy). The result provides valuable information to refine the existing geomechanical model which can be used in future well placement and planning, optimum mud weight design, and constraining water injection operating limit during the life of the field.

Original languageEnglish
Title of host publicationInternational Petroleum Technology Conference 2019, IPTC 2019
PublisherInternational Petroleum Technology Conference (IPTC)
ISBN (Electronic)9781613996195
Publication statusPublished - 1 Jan 2019
Externally publishedYes
EventInternational Petroleum Technology Conference 2019, IPTC 2019 - Beijing, China
Duration: 26 Mar 201928 Mar 2019

Publication series

NameInternational Petroleum Technology Conference 2019, IPTC 2019

Conference

ConferenceInternational Petroleum Technology Conference 2019, IPTC 2019
CountryChina
CityBeijing
Period26/3/1928/3/19

Fingerprint

Shear waves
S-wave
electrical resistivity
Anisotropy
anisotropy
azimuth
Acoustics
dip
acoustics
acoustic data
Shale
shale
well
Planning
Water injection
bedding plane
hydrocarbon reservoir
in situ stress
Hydrocarbons
Boreholes

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Fuel Technology

Cite this

Das, S., Zhang, T., Vevakanandan, V., & Abd. Rahim, M. H. (2019). Integrated study of shear wave and resistivity anisotropy in an inclined well providing insight to the geomechanical model. In International Petroleum Technology Conference 2019, IPTC 2019 (International Petroleum Technology Conference 2019, IPTC 2019). International Petroleum Technology Conference (IPTC).

Integrated study of shear wave and resistivity anisotropy in an inclined well providing insight to the geomechanical model. / Das, Saikat; Zhang, Tingting; Vevakanandan, Valsan; Abd. Rahim, Mohd. Helmi.

International Petroleum Technology Conference 2019, IPTC 2019. International Petroleum Technology Conference (IPTC), 2019. (International Petroleum Technology Conference 2019, IPTC 2019).

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

Das, S, Zhang, T, Vevakanandan, V & Abd. Rahim, MH 2019, Integrated study of shear wave and resistivity anisotropy in an inclined well providing insight to the geomechanical model. in International Petroleum Technology Conference 2019, IPTC 2019. International Petroleum Technology Conference 2019, IPTC 2019, International Petroleum Technology Conference (IPTC), International Petroleum Technology Conference 2019, IPTC 2019, Beijing, China, 26/3/19.
Das S, Zhang T, Vevakanandan V, Abd. Rahim MH. Integrated study of shear wave and resistivity anisotropy in an inclined well providing insight to the geomechanical model. In International Petroleum Technology Conference 2019, IPTC 2019. International Petroleum Technology Conference (IPTC). 2019. (International Petroleum Technology Conference 2019, IPTC 2019).
Das, Saikat ; Zhang, Tingting ; Vevakanandan, Valsan ; Abd. Rahim, Mohd. Helmi. / Integrated study of shear wave and resistivity anisotropy in an inclined well providing insight to the geomechanical model. International Petroleum Technology Conference 2019, IPTC 2019. International Petroleum Technology Conference (IPTC), 2019. (International Petroleum Technology Conference 2019, IPTC 2019).
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