摘要
从构造演化分析入手,通过对澳大利亚西北大陆架石油地质条件的分析,总结了油气分布特征,并对影响油气成藏及分布的主控因素进行了探讨。研究表明:西北大陆架的油气分布在平面上具有分区性,石油主要富集在侏罗纪晚期形成的北东向狭长裂谷内,天然气主要分布在狭长裂谷之外的构造高地上。纵向上,油气分布较为集中,主要分布于中生界。同时,油和气分布具有明显的分层性:天然气主要分布于三叠系和侏罗系储集层,而石油则主要分布于白垩系及以上地层。西北大陆架的油气富集主要受烃源岩、构造背景、大型三角洲沉积体系和区域盖层以及后期保存条件的控制。烃源岩的性质及分布决定了西北大陆架的富气贫油及油、气的平面分布特征;大型的三角洲沉积体系及优质的区域盖层为油气提供了良好的生储盖组合,决定了油气富集的层位;紧邻洼陷分布的构造高地,发育多种类型的圈闭,成为油气运移的有利指向区。
Based on the analysis of tectonic evolution and petroleum geology, the author summarized the oil and gas distribution features of northwest shelf of Australia, and discuss the main controlling factors of hydrocarbon accumulation. The results show that the hydrocarbon distribution of northwest shelf of Australia are divisional in plane, oil mainly occurs in NW trend narrow rifts formed during the late Jurassic, while gas mainly distributed in the outer highs adjacent to those rifts. Vertically, hydrocarbon principally occurs in Mesozoic series with a stratified feature, and gas is concentrated in Triassic and Jurassic reservoirs while oil mainly occurred in Cretaceous and upper formations. Hydrocarbon accumulation of northwest shelf of Australia is principally controlled by source rock, structural background, big delta sedimentary systems, regional seal and later preservation conditions. Source rock property and distribution led to the appearance of ＂rich in gas and poor in oil＂ of northwest shelf Australia and controlled the oil and gas distribution. Big delta sedimentary systems and fine regional seals provided excellent source-reservoir-seal assemblages, and determined the concentration layers of hydrocarbon. Besides, uplifts and highs adjacent to sags are always the favorable areas with all sorts of traps developed.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第1期10-18,共9页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家重大专项"全球剩余油气资源研究及油气资产快速评价技术"(2008ZX05028)
关键词
构造演化
油气分布特征
主控因素
西北大陆架
澳大利亚
tectonic evolution
oil and gas distribution features
main controlling factors
northwest shelf
Australia
