Estudo quimioestratigráfico e palinofaciológico da Formação Ponta Grossa (poço 9-PPG-7-PR), Devoniano da Bacia do Paraná

Abstract

This study has consisted of an analysis of the extracted kerogen from pelites of the borehole 9-PPG-7-PR for the identification and characterization of its components. The 9- PPG-7-PR well, with a thickness of 138.30 meters, is located in the Paraná Basin, in a Devonian age region. The methodology has involved methods of chemical and optical analyzes for detection and evaluation of kerogen. The total organic carbon content (TOC) have an average value of 1.03%, and the samples were separated in seven chemostratigraphic units on the basis of TOC variations. In the most superficial units, the TOC values exceed the value of 1%, indicating better preservation of the organic content in these points. The kerogen was classified as belonging to the types I, II and III, with the predominance of type II in the depths near the top of the borehole, having good potential for the generation of liquid and gaseous hydrocarbons. There is the predominance of organic compounds from the group of palynomorphs. Three palynofacies were identified, based on visual analysis of components under reflected white light and blue light/UV incident. The organic facies BC, C and CD were identified in the section. The spore color index (SCI) has 4,0 and 4,5 values, indicating a thermal growth of the transition stage, with the organic components coming from the hydrocarbon maturation window. The section analyzed of Ponta Grossa Formation represents is an old distal plataformal deposit with more oxic system at the base and an anoxic-disoxic system on top.