Details of the abstract
Title of paper | 3-D Magnetotelluric Forward and Inversion of the Chicontepec oil basin. |
List of authors | O. Avila-Vargas, F. Corbo-Camargo, and C. Castro |
Affiliation(s) |
Posgraduate, Center of Geosciences-UNAM. Center of Geosciences-UNAM. Institute of Geosciences, Goethe University Frankfurt. |
Summary |
According to the National Hydrocarbons Commission (CNH), in the Chicontepec Paleocayon, belonging to the oil province of Tampico – Misantla, that is one of the largest proven and possible oil reserves in Mexico. For this reason, it is important to improve the geological/structural knowledge in the area to have greater precision to determine the best areas to be exploited. This Paleocanyon has complex geology comprised of significant volumes of clay-stone sediments produced by multiple turbidite flow events, forming the reservoir-producing rock. In this investigation, a 3-D resistivity model was generated from the inversion of 83 broad-spectrum Magnetotelluric sites (BMT), measured during an average acquisition time of 1 day, distributed along 5 profiles. The MT stations were acquired in different campaigns since 2019 using Phoenix MTU5-A dataloggers. The time series were processed following a robust single-site approach using the FFMT software package (Castro et al., 2020), Furthermore, we included the analysis of the electromagnetic response in surveys close to drilled wells, to constrain the conductivity distributions. The 3-D inversion started from a homogeneous half-space, including main topographic features within the inner and outer mesh, and cells with fixed resistivity representing the high conductivity of the Gulf of Mexico. model was developed in a semi-homogeneous space with the local topography and the proximity to the Gulf of Mexico. The algorithm applied was ModEM (Egbert and Kelbert, 2012; Kelbert et al. 2014), which follows an inversion scheme based on nonlinear conjugate gradients (NLCG). We present a resistivity model which reveals the geometry of the Paleocanyon both in extension and in-depth, geological structures, and geoelectrical anomalies embedded in the sedimentary deposits that can be associated with the presence of fluids, oil, and/or gas. |
Session Keyword | 3.0 Exploration, Monitoring and Hazards |
File upload |
3.0_3-d_magnetotelluric_forwa_avila vargas.pdf
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