TECTONIC EVOLUTION OF SANTOS BASIN, BRAZIL AND ITS BEARING ON OIL-GAS EXPLORATION

SUN Xudong; ZHENG Qiugen; GUO Xingwei; WEN Zhenhe; ZHANG Xunhua; WANG Jinzhou; LI Jie; LI Ziyuan

doi:10.16028/j.1009-2722.2020.039

2021 Vol. 37, No. 2

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Article navigation > Marine Geology Frontiers > 2021 > 37(2): 37-45

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SUN Xudong, ZHENG Qiugen, GUO Xingwei, WEN Zhenhe, ZHANG Xunhua, WANG Jinzhou, LI Jie, LI Ziyuan. TECTONIC EVOLUTION OF SANTOS BASIN, BRAZIL AND ITS BEARING ON OIL-GAS EXPLORATION[J]. Marine Geology Frontiers, 2021, 37(2): 37-45. doi: 10.16028/j.1009-2722.2020.039

Citation:

SUN Xudong, ZHENG Qiugen, GUO Xingwei, WEN Zhenhe, ZHANG Xunhua, WANG Jinzhou, LI Jie, LI Ziyuan. TECTONIC EVOLUTION OF SANTOS BASIN, BRAZIL AND ITS BEARING ON OIL-GAS EXPLORATION[J]. Marine Geology Frontiers, 2021, 37(2): 37-45. doi: 10.16028/j.1009-2722.2020.039

TECTONIC EVOLUTION OF SANTOS BASIN, BRAZIL AND ITS BEARING ON OIL-GAS EXPLORATION

1.
Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, China
2.
School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, China
3.
Petrochina Southwest Oil & Gas field Company, Chengdu 610000, China

More Information

Corresponding author: ZHENG Qiugen, 2006012017@cugb.edu.cn

Received Date: 17 April 2020

Publish Date: 28 February 2021

Abstract

Abstract

The Santos Basin, a passive continental margin basin in the South Atlantic Ocean on the east coast of Brazil, is an important target for oil-gas exploration for the time being. Based on the interpretation of seismic data, combined with the evolutionary model of a superimposed basin for the South Atlantic Ocean, the tectonic evolution of the Santos Basin can be subdivided into four stages: pre rifting stage, rifting stage, transitional stage and drifting stage, corresponding to the four prototype basins of craton, rift, depression, and passive continental margin. The well-matched spatiotemporal relationship of the prototype basin provides ideal tectonic conditions for the generation of super large oil-gas systems in the Santos Basin. Based on the previous research results on the "source-reservoir-cap system", the oil-gas distribution patterns are clear, that is, "accumulated under salt in the area with thick salt; and above the salt in the area with thin salt ". The analysis of regional tectonic evolutionary history of the basin with seismic data has revealed that there are thick and high-quality lacustrine source rocks in the neglected eastern depression area under salt, oil and gas generated may migrate following the major basement faults and unconformities. Blocked by the evaporite rocks deposited in the transitional period, oil-gas accumulations are dominantly formed in the composite structural and stratigraphic traps and stratigraphic unconformity blocked traps.
- Santos Basin /
- conjugate basin /
- hydrocarbon accumulation /
- eastern depression block

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