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• W2078355541 abstract "Abstract We present a case study of application of seismic inversion in monitoring the movement of thermal front in a heavy oil Field, Balol of Cambay basin, India using onshore time lapse seismic data. The land seismic data aquired over the Field was very noisy and the seimic difference sections were not informative. Thus the primary objective of this study was to make the time lapse 3D seismic data useful and comparable to the baseline data and to track the anomalies related to the combustion process. In this case direct amplitude differencing was not expected to work because of low repeatability of the monitor data sets with respect to the baseline data. The three sets of 3D data acquired during pre- (baseline) and post-combustion stages (monitor data) were different in frequency content, amplitude and spatial alignment; hence it was not possible to generate the difference sections. We therefore carried out pre-stack inversion of the 3D time lapse seismic data. The P-impedance volumes were obtained by simultaneous inversion of angle stacks generated from time migrated data sets corresponding to three production time steps. The inverted P-impedance volumes show spatial variations of some low impedance zones with production time, which can be related to fluid movements. The results from seismic inversion show great promise to monitor movement of thermal front if more well control is provided. Introduction The study area, namely the Balol oil field, is situated in heavy oil belt of north-western part of the intra-cratonic rift graben of the Cambay Basin India at the border of Gujarat and Rajasthan states. The Cambay basin is a deep graben with 5 km or more of Tertiary and Quaternary sediments resting on the Deccan Trap floor (Raju et al., 1971). The Cambay Tertiary basin was also influenced by a set of fault lineaments aligned NE-SW, which are more pronounced in the northern part of the Cambay basin. These faults extend well into the overlying sedimentary cover. A few structures, with heavy hydrocarbons are localized along these lineaments. Balol reservoir is a N-S trending structure of dimension 13 × 1 km with an average dip of 5 to 7 degrees to the East. The viscosity of Balol crude (with API 15.5) varies from 100 to 400 cps at a reservoir temperature of 72 degree Celsius and pressure 104kg/cm2 (Kumar and Mohan, 2004). The porosity of the reservoir is 28% with permeability value of 3–8 Darcy but due to high mobility contrast between oil and water, primary recovery of oil is low (Kumar and Mohan, 2004) and therefore the reservoir is under in-situ combustion process to improve the recovery rate. The in-situ combustion is a thermal recovery technique in which a part of the heavy oil-in-place is burnt to generate heat. This heat brings reduction in viscosity of the crude oil attaining improved mobility and hence increased oil production rate. A typical combustion front moves through the reservoir matrix by consuming the fuel as it moves ahead towards the producing well, thereby leaving practically no oil behind the burning front (Burger, 1976, Tadema and Weijdema, 1970). The combustion is sustained by continuous injection of air from the injector wells. During in-situ combustion process, changes in pressure, temperature and fluid saturation cause changes in seismic response which can be monitored by high resolution 4D seismic data." @default.
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• W2078355541 date "2008-09-21" @default.
• W2078355541 modified "2023-09-25" @default.
• W2078355541 title "Prestack Seismic Inversion Tracks In Situ Combustion: 4D Seismic at the Balol Field, India" @default.
• W2078355541 doi "https://doi.org/10.2118/116600-ms" @default.
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