Erick Alvarez

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Quantifying remaining oil saturation using time-lapse seismic amplitude changes at fluid contacts

Petroleum Geoscience, 2016

Our study shows that time-lapse changes in the amplitude of the seismic reflection at an oil-wate... more Our study shows that time-lapse changes in the amplitude of the seismic reflection at an oil-water contact (OWC) and/ or produced OWC can be used to estimate directly the displacement efficiency of water displacing oil, E D , without the need of a rock and fluid physics model. From this value, it is possible to determine the remaining oil saturation if required. A preliminary application is performed using several published literature examples, which are reinterpreted to assess the average E D and ensure that the theory is consistent with expectations. Next, a North Sea field model with a known E D is used to create fluid-flow predictions and the corresponding synthetic time-lapse seismic data. Application to these data again confirms the basic principles of the method and defines the accuracy when applied to 4D seismic data. Finally, an observed 4D seismic dataset from a producing field in the North Sea is analysed. The results suggest a displacement efficiency of between 21 and 65% with an accuracy of 3% due to data non-repeatability (with a NRMS of between 11 and 13%). Given an average irreducible water saturation of 0.32, this calculates the remaining oil saturations at between 24 and 53% for this field. A prerequisite for use of the proposed OWC approach is that a discrete contact be interpreted on either the 3D or 4D seismic datasets. Therefore, successful application of this technique requires moderate-to high-quality seismic data and a fairly thick reservoir sequence without significant structural complexity.

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An insightful parametrization for the flatlander's interpretation of time-lapsed seismic data

Geophysical Prospecting, 2013

An approximation is developed that allows mapped 4D seismic amplitudes and timeshifts to be relat... more An approximation is developed that allows mapped 4D seismic amplitudes and timeshifts to be related directly to the weighted linear sum of pore pressure and saturation changes. The weights in this relation are identified as key groups of parameters from a petroelastic model and include the reservoir porosity. This dependence on groups of parameters explains the inherent non-uniqueness of this problem experienced by previous researchers. The proposed relation is of use in 4D seismic data feasibility studies and inversion and interpretation of the 4D seismic response in terms of pore pressure and water saturation changes. A further result is drawn from analysis of data from the North Sea and West Africa, which reveals that the relative interplay between the effects of pore pressure and saturation changes on the seismic data can be simplified to the control of a single, spatially variant parameter C S /C P. Combining these results with those from published literature, we find that C S /C P = 8 appears to be a generality across a range of clastic reservoirs with a similar mean porosity. Using this C S /C P value, an in situ seismic-scale constraint for the rock stress sensitivity component of the petroelastic model is constructed considering this component carries the largest uncertainty.

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Desarrollo de Néctares Hipocalóricos Mixtos con Inclusión de Frutos Nativos: Selección y Evaluación de la calidad

Proceedings of the 15th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Global Partnership for Development and Engineering Education”, 2017

The present research aims to include the native Peruvian fruits in the design of drinks with low ... more The present research aims to include the native Peruvian fruits in the design of drinks with low caloric content. For this purpose, four types of mixed nectares are proposed: A (Pineapple, Camu-camu, Apple and extract of purple Maize), B (Manzana, Sanky and Camu-camu), C (Maracuyá, Mango and Aguaymanto) and D Pineapple and Camu-camu), with a sucrose substitution factor by Stevia of 50%, obtained by a relative intensity of sweetness test. For the selection of the nectar types, a preference classification test was used with 120 panels composed of 18-21 year old students and the data were analyzed with the Friedman test and the Kramer test (α = 0.05), where Obtained formulation A, consisting of 27.9% pulp mixture, 10% corn extract, 57.6% water, 4.06% sugar, 0.19% acidulant, 0.05% Antioxidant, 0.12% stabilizer and 0.05% Stevia powder, as the most preferred nectar. To evaluate its quality, the proximal chemical, physicochemical, microbiological, sensorial acceptability tests were tested using a hedonic scale of 9 points, and its useful life through accelerated tests, using the quality parameters as an indicator of deterioration. From the quality tests, a pH of 3

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Quantifying remaining oil saturation using time-lapse seismic amplitude changes at fluid contacts

Petroleum Geoscience, 2016

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An insightful parametrization for the flatlander's interpretation of time-lapsed seismic data

Geophysical Prospecting, 2013

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Desarrollo de Néctares Hipocalóricos Mixtos con Inclusión de Frutos Nativos: Selección y Evaluación de la calidad

Proceedings of the 15th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Global Partnership for Development and Engineering Education”, 2017

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