Review article
https://doi.org/10.17794/rgn.2019.1.7
SOLUTION OF HIGH VELOCITY ANOMALIES IMPERCEPTIBLE TO SEISMIC RESOLUTION, BY MEANS OF SYNTHETIC MODELS, PENOBSCOT FIELD, CANADA
Wilmer Emilio García Moreno
; Sartenejas, Baruta, Miranda State, Metropolitan District (Simón Bolívar University) 89000; Altamira, Chacao, Miranda State, Metropolitan District Venezuela (Latin American Data Processing Center-BGP International of Venezuela) 01060
Iván Daniel Omaña Galeano
; Sartenejas, Baruta, Miranda State, Metropolitan District (Simón Bolívar University) 89000
Abstract
Penobscot Field is located in the Sable Sub-basin in Nova Scotia, Canada, where a 3D seismic acquisition campaign was carried out in 1991 and also two oil wells were previously drilled (L-30 and B-41). In the interpreted seismic data, a discrepancy was found in the travel times of the seismic waves near well B-41, causing a false structural height in the Naskapi Member, Mississauga Formation (Early Cretaceous or Lower Cretaceous) and deeper formations (10 to 15 ms, i.e. approximately 25 m). It was decided to find a solution of this problem using synthetic models. First, making a delimitation of the study area by means of a seismic subcube, which were later interpreted surfaces of interest, through the well data. The average velocity and density properties were found for each interpreted strata. Subsequently, a 2D seismic acquisition was simulated, choosing a line that crossed both wells and through the use of ray traces, synthetic shot gathers were obtained and processed through the use of different seismic migration tests, and the final solution was found to be Kirchhoff pre-stacking migration in depth.
Keywords
high velocity anomaly; Mississauga formation; Nova Scotia, Canada; lower and upper cretaceous; ray tracing; Kirchhoff PSTM and PSDM
Hrčak ID:
216285
URI
Publication date:
6.2.2019.
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