Hydrocarbon Accumulation and Evolution of the Deeply Buried Carbonate Reservoirs: Constraints from Rhenium-Osmium Geochemistry, Apatite Fission Track Ages and Fluid Inclusion

Abstract

The research on the geochronology of hydrocarbon evolution is significant to reconstruct the hydrocarbon evolution process. In most superimposed basins of China, marine reservoirs have experienced complex physicochemical processes, such as alteration, leakage, remigration and re-accumulation, enhancing the difficulty of determination of the key times. This study aims to reconstruct the hydrocarbon accumulation and evolution of the typical deep-buried carbonate reservoirs in China using an integrated Rhenium-Osmium (Re-Os) isotope dating, apatite fission track (AFT), fluid inclusions and GC-MS analysis. The Suqiao buried-hill zone in Bohai Bay Basin, China is selected as the object for its multiple-stage of tectonic deformations and hydrocarbon fillings. Firstly, the GC-MS analysis of ten oil samples and fifteen potential source rock samples will identify the main sources of the petroleum. Secondly, the Re-Os isotope analysis on eight oil samples can determine the absolute timing of hydrocarbon generation. Thirdly, the current burial history models and fluid inclusion data quantitatively constrain the timing of hydrocarbon migration and reservoir charging. Finally, the AFT dating analysis on five sandstone samples within the study area can record the timing of tectonic movement and quantitatively constrain the timing of hydrocarbon alteration and/or leakage. Based on geochemistry and chronological analysis, the hydrocarbon accumulation and evolution of the typical deep-buried carbonate reservoirs can be constructed and may provide guidance for oil exploration in Bohai Bay Basin. In addition, this study may further investigate the applicability of the Re-Os isotope dating on the crude oil.

AAPG Datapages/Search and Discovery Article #90351 © 2019 AAPG Foundation 2019 Grants-in-Aid Projects