Shallow gas accumulation in sediments of the Patos Lagoon, Southern Brazil

被引：18
|
作者：
Weschenfelder, Jair
Correa, Iran C. S.
Aliotta, Salvador
Pereira, Carla M.
De Vasconcellos, Vinicius E. B.
机构：
[1] Univ Fed Rio Grande Sul, Inst Geociencias, BR-91501970 Porto Alegre, RS, Brazil
[2] Inst Argentino Oceanog Complejo CRIBABB, RA-8000 Bahia Blanca, Buenos Aires, Argentina
来源：
ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS | 2006年 / 78卷 / 03期
关键词：
shallow gas; 3.5 kHz seismic; coastal plain; Rio Grande do Sul;
D O I：
10.1590/S0001-37652006000300017
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
A high resolution seismic survey was conducted in the Patos Lagoon, southern Brazil, aboard of the research vessel LARUS of the Fundacao Universidade Federal do Rio Grande (FURG). Around 400 km of 3.5 kHz seismic profiles were collected, which provided acoustic signals of good penetration depth and resolution. Seismic anomalies, including turbidity and pocket gas, revealed that gas-charged sediments are common in several areas of the lagoon. The gas accumulations in the Patos Lagoon are controlled by the spatial distribution of the sedimentary facies. Either in 'curtains' or in 'acoustic turbid zones', the main gas accumulations occur in areas with paleotopographic lows related to fluvial channels and valleys developed in the Rio Grande do Sul coastal plain during regressive/transgressive events of the Quaternary.
引用
收藏
页码：607 / 614
页数：8
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