巴西Solimoes盆地构造演化及油气成藏特征

doi:10.11743/ogg20130312

Abstract

Abstract: Onshore Solimoes Basin in Brazil is an intra-cratonic basin,being very special in its depositional succession and its hydrocarbon accumulation mechanisms.This paper focuses on summarization of the formation and evolution of the basin,its structure and depositional characteristics and its key petroleum geologic features,as well as analysis of hydrocarbon accumulation mechanism and the main controlling factor for accumulations.The basin has experienced multiple tectonic movements,including multiple subsidence during the Paleozoic,a shear stress dominated Mesozoic age,and flexure subsidence in Cenozoic.The deformation style features in change from early normal faulting to later inversion and thrusting.The deposits in the basin are mainly of Paleozoic age,and are complicated in lithologic assemblages,consisting of siliciclastics,carbonates,evaporites,glacial deposits,igneous,etc.All the sequences are in unconformable contacts.The major source rock is the Upper Devonian shale,with high TOC value and high degree of thermal maturity.The main reservoir is the Carboniferous Jurua sandstone.The main seal interval is the Carboniferous-Permian evaporites,which is good in sealing capacity.The source rock-reservoir-seal combination is favorable.The basin has well developed structure traps,which are mainly anticlines and faulted anticlines.The petroleum geology of the basin is special in that the shallowly buried source rocks have entered gas window due to igneous intrusion.Eolian sands have good reservoir quality,with well preserved porosity due to its shallow burial depth.The unconformities and reactivated basement-rooted faults serve as the major pathways for hydrocarbon migration.The accumulation of oil and gas is controlled by the fault-related structrual traps.

Key words: trap, reservoir-cap combination, structural evolution, hydrocarbon accumulation, Solimoes Basin, Brazil

CLC Number:

TE112.3

Xiong Liping, Li Jun, Wu Changwu, Li Songyang. Tectonic evolution and hydrocarbon accumulation in the Solimoes Basin,Brazil[J]. Oil & Gas Geology, 2013, 34(3): 363-369.

References

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Tectonic evolution and hydrocarbon accumulation in the Solimoes Basin,Brazil

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