澳大利亚北波拿巴盆地北部物源分析与沉积特征研究
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摘要
基于地震、钻井资料,从物源供给模式入手,分析波拿巴盆地北部地层的沉积层序、物源特征及其油气勘探前景。研究区具典型断陷—坳陷双层地质结构,表现南北向双物源特点。断陷期物源供给主要来自南部的Darwin陆架,同时还接受北部Sahul台地的物源;拗陷期以南部Darwin陆架物源供给为主。断陷期,南部沉积物在侏罗系形成大规模楔状体,并与北部物源形成的三角洲在中央凹陷带交汇;拗陷期,白垩系发育大规模浅海沉积,且研究区内Sahul台地及其周边发育较大规模的台地石灰岩。地震资料和盆地区域资料显示,位于侏罗系—白垩系的多期次扇三角洲、三角洲、滨岸储层,是良好的油气勘探目标。
Based on the seismic and drilling data and the provenance-supply mode,the sedimentary sequence,provenance features and oil-gas exploration prospects are analyzed.The study area has the typical double-layer geologic structure of rift-depression,and has double provenance supply in the north and south.The provenance supply in rifting period was mainly from the southern Darwin shelf,and was also from the northern Sahul Platform,while the provenance supply in depression period was mainly from the southern Darwin shelf.In the rifting period,the southern sediment formed a large-scale progradation body,and encountered the delta formed by the northern provenance in the central depression;in the depression period,large-scale neritic deposits developed in Cretaceous,and relatively large-scale platform limestone developed in Sahul Platform and its surroundings in the study area.The seismic data and basin data indicate that,the multi-stage reservoirs of delta,fan delta and shore of Jurassic-Cretaceous could be the good exploration targets.
Based on the seismic and drilling data and the provenance-supply mode,the sedimentary sequence,provenance features and oil-gas exploration prospects are analyzed.The study area has the typical double-layer geologic structure of rift-depression,and has double provenance supply in the north and south.The provenance supply in rifting period was mainly from the southern Darwin shelf,and was also from the northern Sahul Platform,while the provenance supply in depression period was mainly from the southern Darwin shelf.In the rifting period,the southern sediment formed a large-scale progradation body,and encountered the delta formed by the northern provenance in the central depression;in the depression period,large-scale neritic deposits developed in Cretaceous,and relatively large-scale platform limestone developed in Sahul Platform and its surroundings in the study area.The seismic data and basin data indicate that,the multi-stage reservoirs of delta,fan delta and shore of Jurassic-Cretaceous could be the good exploration targets.
引文
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[2]Wilgus C K,Ross C A,Posamentier H.Sea-level changes:an integrated approach.SEPM Special Publication,1988,25(4):36～43.
[3]Galloway W E.Genetic stratigraphic sequences in basin analysisⅠ:architecture and genesis of flooding-surface bounded deposional units.AAPG Bulletin,1989,73(2):125～142.
[4]Galloway W E.Genetic stratigraphic sequences in basin analysisⅡ:application to northwest Gulfof Mexico Cenozoic basin.AAPG Bulletin,1989,73(2):143～154.
[5]徐怀大.从地震地层学到层序地层学[M].北京:石油工业出版社,1997.
[6]徐怀大.层序地层学原理[M].北京:石油工业出版社,1993.
[7]张万选,张厚福,曾洪流,等.陆相断陷盆地区域地震地层学研究[M].东营:石油大学出版社,1988.
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