{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,31]],"date-time":"2026-01-31T12:11:33Z","timestamp":1769861493550,"version":"3.49.0"},"reference-count":31,"publisher":"Geological Society of London","issue":"4","license":[{"start":{"date-parts":[[2015,8,14]],"date-time":"2015-08-14T00:00:00Z","timestamp":1439510400000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-002"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["PG"],"published-print":{"date-parts":[[2015,11]]},"abstract":"<jats:p>\n            We evaluate the use of the magnetotelluric (MT) method to locate crystalline basement and overlying carbonate reservoir rocks underneath a thick overburden in the S\u00e3o Francisco basin in Brazil. Mapping the complex basement and the carbonate reservoir using seismic reflection is a major problem in hydrocarbon exploration in this intracratonic basin, and it is expected that MT will provide useful complementary information. In the present study, we analysed 31 MT soundings along four survey lines in the central region of the basin. The MT soundings covered a period range of 0.001\u2013100\u2009s, probing the subsurface resistivity structure down to a maximum depth of about 15\u2009km. The MT data were inverted using a regularized two-dimensional (2D) inversion algorithm with a variety of\n            <jats:italic>a priori<\/jats:italic>\n            data for comparison. For model appraisal, we analysed well log (gamma ray, deep resistivity and neutron porosity) data as well as seismic, gravity and magnetic profiles coincident with one MT line passing through the well. We found that shallow geological boundaries separating zones of strong resistivity contrasts also coincide with seismic boundaries in the inversion models with or without a priori data. Using gravity data, it was also possible to define the compartmentalized basement in this sector of S\u00e3o Francisco Basin, not clear in the seismic section. However, only by integrating all available information were we able to map the Lagoa do Jacar\u00e9 and Sete Lagoas carbonate member-formations of the Bambu\u00ed Group, which are considered to host both the source and reservoir rocks identified from past exploratory history of this basin. We also imaged a basement structural high with thinned or disrupted conductive cover rocks over a known zone of hydrocarbon microseepage and a buried conductive (source rock?) channel at its NW margin, the trace of which coincides with the present-day River Paracatu along which gas bubbles have been observed. This suggests that MT may be fruitfully integrated with gravity, magnetic and seismic data to study the structural controls on hydrocarbon occurrence in this basin.\n          <\/jats:p>","DOI":"10.1144\/petgeo2013-013","type":"journal-article","created":{"date-parts":[[2015,8,15]],"date-time":"2015-08-15T02:34:48Z","timestamp":1439606088000},"page":"285-299","source":"Crossref","is-referenced-by-count":9,"title":["Magnetotelluric imaging integrated with seismic, gravity, magnetic and well-log data for basement and carbonate reservoir mapping in the S\u00e3o Francisco Basin, Brazil"],"prefix":"10.1144","volume":"21","author":[{"given":"F. F.","family":"Solon","sequence":"first","affiliation":[{"name":"Department of Geophysics, Observatorio Nacional\/MCTI, 20921\u2013400 S\u00e3o Crist\u00f3v\u00e3o, Rio de Janeiro, Brazil"}]},{"given":"S. L.","family":"Fontes","sequence":"additional","affiliation":[{"name":"Department of Geophysics, Observatorio Nacional\/MCTI, 20921\u2013400 S\u00e3o Crist\u00f3v\u00e3o, Rio de Janeiro, Brazil"}]},{"given":"M. A.","family":"Meju","sequence":"additional","affiliation":[{"name":"Exploration Technical Services Division, Petronas Carigali, Petronas Twin Towers, 50088 Kuala Lumpur, Malaysia"}]}],"member":"1881","published-online":{"date-parts":[[2015,8,14]]},"reference":[{"key":"e_1_3_2_2_1","first-page":"9","volume-title":"S\u00e3o Francisco Basin: geology and natural resources","author":"Alkmim F.F.","year":"2001","unstructured":"Alkmim F.F., Martins-Neto M.A. 2001. A bacia intracrat\u00f4nica do S\u00e3o Francisco: Arcabou\u00e7o estrutural e cen\u00e1rios evolutivos. In: , Pinto C.P., Martins-Neto M.A. (ed.) Bacia do S\u00e3o Francisco: Geologia e recursos naturais. [The S\u00e3o Francisco Intracratonic Basin: structural framework and evolutionary scenario. In: , Pinto C.P., Martins-Neto M.A. (ed.) S\u00e3o Francisco Basin: geology and natural resources.] Sociedade Brasileira de Geologia, Belo Horizonte, Brazil, 9\u201330. [In Portuguese]"},{"key":"e_1_3_2_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0040-1951(98)00272-8"},{"key":"e_1_3_2_4_1","doi-asserted-by":"publisher","DOI":"10.1017\/CBO9780511549816"},{"key":"e_1_3_2_5_1","first-page":"115","volume-title":"Origin and evolution of sedimentary basins","author":"Braun O.P.G.","year":"1990","unstructured":"Braun O.P.G., Mello U., Della Piazza H. 1990. Bacias Proteroz\u00f3icas Brasileiras com perspectivas explorat\u00f3rias para hidrocarbonetos. In: , Raja Gabaglia G.P., Milani E.J. (eds) Origem e Evolu\u00e7\u00e3o de Bacias Sedimentares. [Proterozoic Brazilian basins with exploratory prospects for hydrocarbons. In: , Raja Gabaglia G.P., Milani E.J. (eds) Origin and evolution of sedimentary basins.] Petrobras\/SEREC\/CEN-SUD, Rio de Janeiro, Brazil, 115\u2013132. [In Portuguese]"},{"key":"e_1_3_2_6_1","doi-asserted-by":"publisher","DOI":"10.1190\/1.1437915"},{"key":"e_1_3_2_7_1","doi-asserted-by":"publisher","DOI":"10.1190\/geo2011-0098.1"},{"key":"e_1_3_2_8_1","doi-asserted-by":"crossref","unstructured":"Figueiredo I. Meju M.A. Fontes S.L. 2008. Heterogeneous crust and upper mantle across the SE Brazilian Highlands and the relationship to surface deformation as inferred from magnetotelluric imaging. Journal of Geophysical Research 113 B03404 http:\/\/dx.doi.org\/10.1029\/2007JB005108.","DOI":"10.1029\/2007JB005108"},{"key":"e_1_3_2_9_1","first-page":"265","volume-title":"S\u00e3o Francisco Basin: geology and natural resources","author":"Fugita A.M.","year":"2001","unstructured":"Fugita A.M., Clark Filho J.G. 2001. Recursos energeticos da Bacia do S\u00e3o Francisco: Hidrocarbonetos liquidos e gasosos. In: , Pinto C.P., Martins-Neto M.A. (eds) A Bacia do S\u00e3o Francisco: Geologia e Recursos Naturais. Energy resources of S\u00e3o Francisco Basin: Liquid and gaseous hydrocarbons. In: , Pinto C.P., Martins-Neto M.A. (eds) S\u00e3o Francisco Basin: geology and natural resources. Sociedade Brasileira de Geologia, Belo Horizonte, Brazil, 265\u2013284. [In Portuguese]"},{"key":"e_1_3_2_10_1","doi-asserted-by":"publisher","DOI":"10.1190\/geo2011-0394.1"},{"key":"e_1_3_2_11_1","doi-asserted-by":"publisher","DOI":"10.1190\/1.1440923"},{"key":"e_1_3_2_12_1","doi-asserted-by":"publisher","DOI":"10.1190\/1.1440885"},{"key":"e_1_3_2_13_1","doi-asserted-by":"publisher","DOI":"10.25249\/0375-7536.2008382S197212"},{"key":"e_1_3_2_14_1","doi-asserted-by":"publisher","DOI":"10.1190\/1.1442533"},{"key":"e_1_3_2_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.marpetgeo.2007.10.001"},{"key":"e_1_3_2_16_1","doi-asserted-by":"publisher","DOI":"10.1190\/1.1443956"},{"key":"e_1_3_2_17_1","doi-asserted-by":"crossref","unstructured":"Meju M.A. Sasaki Y. 2011. Reply to \u2018Three-dimensional galvanic distortion of three-dimensional regional conductivity structures: Comment on Three-dimensional joint inversion for magnetotelluric resistivity and static shift distributions in complex media\u2019 by A. G. Jones. Journal of Geophysical Research: Solid Earth 116 B12105 http:\/\/dx.doi.org\/10.1029\/2011JB008807.","DOI":"10.1029\/2011JB008807"},{"key":"e_1_3_2_18_1","doi-asserted-by":"publisher","DOI":"10.1190\/1.1444539"},{"key":"e_1_3_2_19_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2478.1982.tb01298.x"},{"key":"e_1_3_2_20_1","first-page":"265","volume-title":"Bacia do S\u00e3o Francisco: Geologia e Recursos Naturais","author":"Pinto C.P.","year":"2001","unstructured":"Pinto C.P., Martins-Neto M.A. (eds). 2001. Bacia do S\u00e3o Francisco: Geologia e Recursos Naturais. [S\u00e3o Francisco Basin: Geology and natural resources.] Sociedade Brasileira de Geologia, Belo Horizonte, Brazil, 265\u2013285. 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[In Portuguese]"},{"key":"e_1_3_2_23_1","doi-asserted-by":"publisher","DOI":"10.1590\/S0102-261X2001000200003"},{"key":"e_1_3_2_24_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2478.1979.tb00994.x"},{"key":"e_1_3_2_25_1","doi-asserted-by":"publisher","DOI":"10.1190\/1.1444893"},{"key":"e_1_3_2_26_1","first-page":"44","volume-title":"Atas do Simp\u00f3sio do Cr\u00e1ton do S\u00e3o Francisco, 3, Salvador.","author":"Romeiro-Silva P.C.","year":"2005","unstructured":"Romeiro-Silva P.C., Zal\u00e1n P.V. 2005. Contribui\u00e7\u00e3o da s\u00edsmica de reflex\u00e3o na determina\u00e7\u00e3o do limite oeste do Cr\u00e1ton do S\u00e3o Francisco. [Seismic reflection contribution to determine the western limit of S\u00e3o Francisco Craton. In: Paper presented at S\u00e3o Francisco Craton Symposium, 3, Salvador.] In: Atas do Simp\u00f3sio do Cr\u00e1ton do S\u00e3o Francisco, 3, Salvador. Sociedade Brasileira de Geologia, Belo Horizonte, Brazil, 44\u201347. 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