摘要
在调研前人研究成果的基础上,以地震资料最为详实的巴布亚湾海域区块为例,从区域构造演化入手,探讨研究区构造特征及油气圈闭类型,得出以下认识:1盆地主要经历了裂谷前基底期、冈瓦纳同生裂谷—裂后期、珊瑚海同生裂谷—裂后期、达拉伊弧后伸展期和前陆盆地期等演化阶段,沉积地层垂向呈"二元结构",即前陆构造层叠加在达拉伊弧后及其下的裂谷—裂后期构造层之上,并呈楔状向南西西快速减薄超覆于东部高地之上;2巴布亚湾海域区块形成了以欧拉褶皱带为前陆冲断带、以莫尔比拗陷为前渊带、以东部高地为前陆隆起和以布莱盆地为隆外拗陷的前陆盆地系统;3初步分析圈闭类型和油气成藏条件后认为,裂谷—裂后和弧后伸展阶段形成优质海相烃源岩,前陆期形成良好的储盖组合;前陆冲断带发育的成排、成带逆冲背斜为首选钻探目标,前渊带的扇三角洲岩性体、浊积水道和前陆隆起带潜山构造及复合圈闭为潜在目标。
Based on detailed seismic data,we analyze tectonic structural features and hydrocarbon trap types in Papua bay block according to regional tectonic evolution.The following observations are obtained: A.It has experienced basal stage,Gondwana and coral sea syngenetic rift-rift-extension stage,Dara back-arc extension stage,and foreland stage;there is a'dual structure'vertical sedimentary strata,namely foreland is overlayed on rift formation,which is rapid wedge shaped in the eastern highlands.B.Papua bay block has complete foreland basin system structure:Aure fold thrust belt,Morseby foredeep belt,eastern highlands foreland uplift and Bligh depression.C.Based on trap type and hydrocarbon accumulation condition analysis,high quality marine hydrocarbon source rock was formed during rift-extensional basin,and then good assemblages are formed in the foreland stage;thrust anticlines are the first drilling targets in the thrust nappe belt,lithologic body and turbidite channel of fan delta in foredeep belt as well as sub-mountain and composite trap in forebulge belt are potential targets.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2016年第1期190-196,203,共8页
Oil Geophysical Prospecting
基金
国家自然科学基金项目(41202088)资助
关键词
构造演化
巴布亚盆地
油气圈闭
前陆盆地
tectonic evolution
Papuan Basin
hydrocarbon trap
foreland basin
