Modelagem bidimensional e interpretação geológico-estrutural com base em dados aerogravimétricos e aeromagnetométricos de uma área a sudeste da Bacia do Parnaíba

Abstract

Airborne geophysical surveys are widely used in geological prospecting of hydrocarbon reservoirs. The efficiency and acquisition speed of these methods in covering large areas, accredit then as a key tool for any project of prospecting located in frontier basins, such as Parnaíba Basin, where there is a quantity amount technical data. Among the airborne geophysical methods, potential methods, namely, gravity and magnetics are the most spread in O & G (Oil and Gas) projects of this nature. Such methods are used to support the generation of regional geological knowledge and also in detailed approaches, integrated with seismic, geochemical and well data. Specifically in the case of magnetometry, its use in more detailed specifications are available in the Brazilian market since the year 1988 with the release of the GPS signal to the market and mainly after the replacement of the proton precession magnetometers, by the cesium vapor (1991-1994), these one, much more accurate in determining the anomalous magnetic field. In terms of Airborne Gravity, applications in detailed approach was not available to the Brazilian market until the year 2006, surveys. This adaptation, brang some operational limitations to the system, since the initial conception was not thought for aerial surveys purposes. Even considering theses limitations, the data showed very good resolution for conventional gravity , and evaluate the results of its application in the study area portion east of the Parnaíba Basin through a geological-geophysical qualitative interpretation performed by generating tectono-structural maps and also magnetic lineaments. The scope of this work led to a qualitative interpretation of magnetic lineaments and high gravimetric and structural lows, suggesting a map of the integrated structural context of geological and geophysical methods of the study area