巴西大坎波斯盆地裂谷体系及其对盐下成藏的控制作用

doi:10.11743/ogg20150203

Abstract

Abstract: Great Campos Basin in offshore eastern Brazil has been one of the major investment attractions for Chinese oil companies.Based on previous studies and the latest exploration achievements in the basin,the article identified its evolution stages,analyzed its structural features,and discussed the controlling effect of structural differences upon the formation of pre-salt accumulations.The basin had experienced five stages of tectonic evolution:intracratonic depression during the Late Triassic-Jurassic,intracontinental rifting in Neocomain-Barremian,rift-depression transition in the Aptian,initial opening in the Albian-Santonian and large-scale rifting in the Campanian-Pliocene.The overall tectonic system during the rifting stage can be likened to a “chessboard” featuring dipping direction(EW)zonation and strike(SN)segmentation.Along the dipping direction,the tectonic system consists of four belts in terms of depth of bedrock:nearshore concave belt,central low-convex belt,offshore concave belt and external high belt.Along the strike,the tectonic system is divided into 3 segments by the accommodating fault belt:Santos,Campos and Espírito Santos.They differ in tectonic line,rift shape and sedimentary thickness.The controlling effect of rift system upon the pre-salt accumulations in the basin is mainly expressed through source rock maturity;trap types and distribution of good reservoir rocks.The external high belt and central low-convex belt in the basin is considered as the most promising targets for pre-salt exploration.

Key words: tectonic evolution, rift system, pre-salt accumulation, play fairway, Great Campos Basin, Brazil

CLC Number:

TE121.2

Wang Xinwei, Meng Qingqiang, Wu Changwu, Tao Ye, Guo Yongqiang, Zhang Yunxia. Rift system and its controlling effects upon pre-salt hydrocarbon accumulation in Great Campos Basin, Brazil[J]. Oil & Gas Geology, 2015, 36(2): 193-202.

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Rift system and its controlling effects upon pre-salt hydrocarbon accumulation in Great Campos Basin, Brazil

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