Abstract
ABSTRACT: The Paraná Basin holds in its stratigraphic record a thick layer of volcanic rocks related to the opening of the Gondwana Supercontinent, which occurred during the Eocretaceous. Based on the interpretation of three two-dimensional (2D) seismic lines in the region of Guareí, East-Central São Paulo state, in the Southeast of Brazil, the subsurface geometries of these volcanic rocks were identified. Since the original seismic resolution quality was low, alternative techniques were utilized to improve the seismic imaging, such as isolating maximum and minimum amplitude values by manipulating the color scale, and using the root mean square (RMS) attribute and the Amplitude Volume technique (tecVA), which emphasize the seismic signature of igneous rocks in relation to sedimentary layers. The use of such techniques allowed the identification of different geometries of diabase sills and showed a relationship between these intrusive and organic matter maturation of the source rock.
Highlights
Regardless of the tectonic context of a sedimentary basin, the presence of magmatic rocks in its stratigraphic record is recurring
Igneous rocks can be classified as elements of the petroleum system, as reservoir rocks and seals, or as forming structural traps which hold the oil
The intermediate wavelet was extracted from 600–940 ms, which includes younger reflections of the Itararé Group, which does not show high contrast impedance
Summary
Regardless of the tectonic context of a sedimentary basin, the presence of magmatic rocks in its stratigraphic record is recurring. It is very important to understand the origin, the structure and the geometry of magmatic intrusions, when trying to assess the economic impact of those occurrences in sedimentary basins with hydrocarbon exploration potential. Igneous rocks can be classified as elements of the petroleum system, as reservoir rocks and seals, or as forming structural traps which hold the oil. Reservoir rocks of magmatic origin occur in several oilfields in the Liaohe Basin, China (Chen et al 1999). In the Neuqén Basin, Argentina, oil and gas are found in the fractures of diabase sills intruded in the source rocks (Schiuma 1988). In Brazil, the oilfields of Badejo and Linguado, located in the southern portion of the Campos Basin, produce oil from fractured basalt
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