CAJ | 학술논문

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.
종구조연화분석입수,통과대오대리아서북대륙가석유지질조건적분석,총결료유기분포특정,병대영향유기성장급분포적주공인소진행료탐토.연구표명:서북대륙가적유기분포재평면상구유분구성,석유주요부집재주라기만기형성적북동향협장렬곡내,천연기주요분포재협장렬곡지외적구조고지상.종향상,유기분포교위집중,주요분포우중생계.동시,유화기분포구유명현적분층성:천연기주요분포우삼첩계화주라계저집층,이석유칙주요분포우백성계급이상지층.서북대륙가적유기부집주요수경원암、구조배경、대형삼각주침적체계화구역개층이급후기보존조건적공제.경원암적성질급분포결정료서북대륙가적부기빈유급유、기적평면분포특정;대형적삼각주침적체계급우질적구역개층위유기제공료량호적생저개조합,결정료유기부집적층위;긴린와함분포적구조고지,발육다충류형적권폐,성위유기운이적유리지향구.
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.