alexa Discontinuity Attributes, their Visualization and Seismic Interpretation: Case Studies from Indus Basin, Pakistan
ISSN 2472-0518

Oil & Gas Research
Open Access

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Research Article

Discontinuity Attributes, their Visualization and Seismic Interpretation: Case Studies from Indus Basin, Pakistan

Asif AA*, Rehman EA, Shoaib K, Anjum AG and Mustafa RK

Kuwait Foreign Petroleum Exploration Company (KUFPEC), 3rd floor, Ufone Tower, 55-C, Jinnah Avenue, Islamabad, Pakistan

*Corresponding Author:
Asif AA
Kuwait Foreign Petroleum Exploration Company (KUFPEC)
3rd floor, Ufone Tower, 55-C, Jinnah Avenue
Islamabad, Pakistan
Tel: 0923345438773
E-mail: [email protected]

Received date: November 26, 2015; Accepted date: December 18, 2015; Published date: December 23, 2015

Citation: Asif AA, Rehman EA, Shoaib K, Anjum AG, Mustafa RK (2015) Discontinuity Attributes, their Visualization and Seismic Interpretation: Case Studies from Indus Basin, Pakistan. Oil Gas Res 2:107. doi: 10.4172/2472-0518.1000107

Copyright: © 2015 Asif AA, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

 

Abstract

There are a number of discontinuity attributes that are considered useful for identifying faults and small fractures that can’t be fully delineated using seismic amplitude data. Out of the many available discontinuity attributes, curvature and coherence have been selected because of their proven abilities to delineate faults/fractures effectively and also their suitability to the subsurface structures present in case of volumes used. This paper highlights the practical importance of curvature and coherence attributes applied on two seismic data sets (3D volumes) from Indus basin, Pakistan, both exhibiting extensional tectonics. Curvature attributes can be measured in different directions but mostpositive and most-negative curvature are found to be of best use in highlighting extensional regime’s geometry very effectively. Apart from highlighting faults across a 3D cube, curvature attributes also give useful information about the highs and lows present in the data set that can be well correlated with the subsurface geology. Coherence checks for similarity between adjacent seismic traces and can be calculated using different techniques like crosscorrelation, semblance and eigen structure measures after analyzing dips and azimuths. Coherence and curvature (most negative and most positive) cubes have been extracted using conventional Pre-stack seismic volumes after a careful selection of parameters. Different examples have been included, compared and explained with reference to coherence and curvature results. The use of mentioned attributes effectively demarcated faults’ orientations and their lateral and vertical extents. Many of the small faults that were not clearly visible on conventional seismic data were well highlighted using attributes’ results viewed and analyzed along time-slices as well as horizon slices.

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