- Home
- Conferences
- Conference Proceedings
- Conferences
Second EAGE Conference on Near Surface in Latin America
- Conference date: November 3-4, 2022
- Location: Bogota, Colombia / Online
- Published: 03 November 2022
-
-
Elastic FWI in VTI Media Using Logging Data Constraints and Gradient Preconditioning
More LessSummaryIn this paper, a new multi-parameter full-waveform inversion method is proposed to reduce the interference between the parameter gradients and constrain the multi-solvability of the inversion. In this paper, we build on the velocity-based parameterization method of Kamath and Tsvankin (2016) and use the logging data to constrain the multi-solvability of the full waveform inversion. We derive the objective function and gradient equation for the full waveform inversion of parametric elastic wave VTI media based on the constraint of logging information. To reduce the interference between the parameter gradients, we incorporate a pseudo-Hessian matrix to preprocess the gradients and derive a gradient preconditioning formula based on the pseudo-Hessian matrix in this paper.
-
-
-
Reducing the Environmental Impact of Acquiring Shallow Seismic Surveys Via Alternative Geometries
Authors A. Crook, A. Birce, M. Naghizadeh, S. Ross, P. Vermeulen and C. CrookSummaryConventional seismic acquisition typically involves orthogonal geometries, which can be expensive to acquire and have a high environmental impact (numerous intersecting seismic cut lines) when utilized for shallow seismic exploration surveys. In this case study, we present results of a decimation test examining the ability of alternative geometries to provide good quality subsurface imaging while also reducing the environmental footprint associated with seismic acquisition.
-
-
-
High-Resolution Reflection seismic Survey for Dewatering Well Placement in Hard-Rock Mining
Authors I. Omaña and S. HerlitzSummaryMine dewatering is a routine activity in open pit mining that requires drilling and regular replacement os large diameter dewatering wells. Regularly, in hard-rock environments, the direct placement into fracture or alteration zones are most required but detailed location knowledge is poor. A High-resolution reflection seismic survey with attribute analysis and acoustic impendance inversion was performed for placement of the drilling directly into the most promising zones in order to lower the water flow into the pit to a minimum.
-
-
-
Interpretation of CSRMT data in the Study of Anisotropic Media
Authors A. Shlykov, A. Saraev and B. TezkanSummaryResults of the individual isotropic 2D inversion of CSRMT and ERT data and their joint anisotropic 1D inversion in the study anisotropic media are considered. According to the individual isotropic inversion of ERT data, the thicknesses of anisotropic layers are significantly larger than from the borehole data. Resistivity section according to the individual isotropic inversion of CSRMT data is limited in depth. The joint anisotropic inversion using a newly developed algorithm and software ensures the information about horizontal and vertical resistivities and the coefficient of anisotropy of layers. Positions of contacts of different layers in the upper and deep parts of the resistivity section were successfully compared with borehole information.
-
-
-
3D IP using a Distributed Array
Authors C. Nind, C. Phaneuf, P. Coles and N. VeilletteSummaryFor several years Abitibi Geophysics has carefully looked at how to increase the depth of investigation and resolution of induced polarization (IP). Researching the sensitivity response of various electrode configurations spawned the design of a 3D configuration which has demonstrated depth, stable inversion characteristics and cost-efficiency.
The success of 3D IP is a combination of various elements, namely: electrode configuration, quality of the acquisition, instruments used, and inversion. Abitibi Geophysics has developed various 3D cable acquisition systems, and now provides a cable free system using Iris Instruments Full Waver technology that allows for a versatile survey configuration. We will review the instruments and present result survey examples.
-
-
-
Imaging the CarbFix2 Reinjection Reservoir at Hellisheiði, Iceland, with Body-Wave Seismic Interferometry
Authors S. Hassing, D. Draganov, A. Barnhoorn and M. JanssenSummaryIn July 2021, passive seismic data has been recorded on a network of geophones at the CarbFix2 injection site at Hellisheiði, Iceland. This data is processed using seismic interferometry to get an image of the injection reservoir. The data is split up into noise panels. Panels dominated by body-wave energy are selected using an illumination analysis. In panels where the dominant event has a (near) vertical incidence, each trace is autocorrelated to get a zero-offset section. In panels where the dominant event is recognized as a body-wave event, all the traces are crosscorrelated, obtaining virtual common-shot gathers. This is processed with a reflection-seismology workflow to obtain a stacked section. Comparing the two final sections shows that similar reflectors are imaged. The zero-offset section shows a higher frequency content, while the stacked section shows more continuous reflectors. Comparison with a local geological model shows that the results are plausible, but that a better interpretation has to wait for more results of the same survey to be processed.
-
-
-
Airborne Gravity Gradient Data for the Energy Transition – Examples of Geothermal, Uranium & Nickel Exploration
Authors D. Burrows, J. Sykes and J. FeijthSummaryAs the world changes the way it views, produces, and consumes energy the resource exploration sector is playing an increasingly important role in the global economy. Exploration for minerals critical to electrification, as well as for clean energy resources has spurred a boom in jurisdictions that host these resources.
We will delve into three examples where high-resolution airborne gravity has been used to assist in the exploration for Nickel and Uranium in Canada, and geothermal resources in Japan. Furthermore, we will also discuss the role governments and private exploration companies play in the resource exploration sector in general.
-
-
-
Technical Feasibility Evaluation of Miscible CO2 Injection as an Enhanced Recovery Method in a Colombian Field
More LessSummaryThis article aims to evaluate case study conditions in a Colombian field, for the implementation of CO2 injection to increase the recovery factor in heavy oil reservoir, taking into account parameters for evaluation, in addition to making theoretical comparisons according to analytical methods proposed by different authors, in order to demonstrate an increase in the recovery factor. The analytical models used in the evaluation are to determine the minimum miscibility pressure proposed by Holm and Joseldan, Yelling W.F, Metcalfe R.S, Holm and Jolseldan corrected by Mungan and IRP correction. A description and comparison of each model is provided. The methodological development allowed to conclude the feasibility of CO2 injection in the studied field, from the results obtained, it is concluded with the construction of a simplified analytical model of the minimum miscibility pressure (MMP) to determine the miscibility displacement of the reservoir during CO2 injection, in relation to the theoretical analytical methods.
-
-
-
Evaluation of Environmental Impacts and Economic viability of a Hybrid System in the Colombian Caribbean.
Authors S. Hernandez Puerto and L.T. Ballesteros RozoSummaryOver time the oil industry in Colombia has been transformed, since according to the ANH (National Hydrocarbons Agency) the new mission to increase production and obtain an increase in national reserves is to promote the optimal and sustainable use of resources hydrocarbons in the country, so that offshore operations regain importance and it is necessary to make use of other energies to supply the energy necessary for the production of hydrocarbons in these platforms.
The feasibility of implementing a hybrid energy system with the use of the tides and the wind, its approach is efficient, according to the fact that in the platforms that are in operation offshore in Colombia are areas where it allows it to be evaluated from the point From an environmental and economic point of view, the possibility of obtaining electrical energy that is generated from marine currents and the use of surrounding wind turbines by the Colombian Caribbean, due to the fact that its marine currents are high, thus allowing a greater flow of wind.
-
-
-
Potential for the Use of Coconut Husks as a Solid Biofuel in Colombia
Authors M.E. Gonzalez Gonzalez, K.S. Perez Gomez and J.G. Rojas GomezSummaryDue to the constant demand for energy by human beings and the sudden climatic changes due to greenhouse gas emissions caused by the use of hydrocarbon energies, the increase in global temperature, as well as the massive deforestation of large areas of forests and jungles to obtain wood as a source of energy in homes and industries, it is necessary to investigate other sources of energy that are friendlier to the planet, such as biomass. In Colombia, there are different types of agro-industrial wastes such as coconut shells that are currently being used to generate energy thanks to their calorific value, and can also be transformed into charcoal to maximize its energy efficiency. Thanks to this process of modifying the use of coconut shells, which is not so complex, small projects have been proposed in rural areas of Colombia to use these wastes.
-