![]() ![]() The use of mentioned attributes effectively demarcated faults’ orientations and their lateral and vertical extents. Different examples have been included, compared and explained with reference to coherence and curvature results. ![]() Coherence and curvature (most negative and most positive) cubes have been extracted using conventional Pre-stack seismic volumes after a careful selection of parameters. 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. 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. 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. 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. 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. 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. Visit for more related articles at Oil & Gas Research 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. Received date: NovemAccepted date: DecemPublished date: December 23, 2015Ĭitation: Asif AA, Rehman EA, Shoaib K, Anjum AG, Mustafa RK (2015) Discontinuity Attributes, their Visualization and Seismic Interpretation: Case Studies from Indus Basin, Pakistan. Kuwait Foreign Petroleum Exploration Company (KUFPEC)ģ rd floor, Ufone Tower, 55-C, Jinnah Avenue Kuwait Foreign Petroleum Exploration Company (KUFPEC), 3 rd floor, Ufone Tower, 55-C, Jinnah Avenue, Islamabad, Pakistan *Corresponding Author: Asif AA Therefore, these regions could be inferred as potential hydrocarbon zones and locations for future wells placement.Discontinuity Attributes, their Visualization and Seismic Interpretation: Case Studies from Indus Basin, PakistanĪsif AA *, Rehman EA, Shoaib K, Anjum AG and Mustafa RK Further results show relatively high fracture density at the western central and south eastern regions of the study area. A multi-attribute analysis was performed to optimise fractures prediction. fractures with predominant trends NW – SE and NE – SW. The attribute analyses result at time-slices 2024 ms, 2100 ms and 2197 ms show subtle features i.e. Conventional log from porosity density was used to validate the interpreted fractures within the borehole environment. Time-slices were extracted within the horizons of interest for seismic attribute analysis. The input seismic data of the study field was initially conditioned using the dip steering algorithm to improve the image quality of fractures in the data. This study aims to predict and characterise sub-seismic scale fractures within low-permeability siliciclastic reservoirs of Agbada Formation in “Kin” Field onshore Niger Delta basin by using discontinuity attributes i.e. These fractures on typical seismic section are designatesub-seismic scale structures, occur below seismic resolution and thus difficult to detect on seismic section. In hydrocarbon exploration, fractures act as possible pathways for hydrocarbon flow especially in low-permeable siliciclastic reservoirs and carbonate reservoir layers. ![]()
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