CAJ | 학술논문

综合前人对柴达木北缘盆地演化和含油气系统的研究成果,遵循油气成藏动力学研究的思路和方法,以动态成藏要素研究为主线,采用盆地分析和数值模拟方法,恢复盆地演化过程;综合考虑不同时期烃源岩特征、流体势场及主要输导层输导物性分布,对主要成藏期的油气运聚过程进行了模拟分析,总结了柴北缘油气成藏的主控因素及成藏规律.研究结果表明,中新世是研究区侏罗系烃源岩主要的生油期,生排运量均足够丰富,但这时赛什腾凹陷只是一里坪坳陷的北部斜坡,构造圈闭主要在盆地边缘,相当大部分的油都运移到盆地边部,可能在后期的构造变动中逸散;上新世以来的晚成藏期,研究区烃源岩以生气为主,这时构造圈闭发育,天然气成藏条件具备,盆地深层构造圈闭易于形成较大规模低渗气藏.图6参62
종합전인대시체목북연분지연화화함유기계통적연구성과,준순유기성장동역학연구적사로화방법,이동태성장요소연구위주선,채용분지분석화수치모의방법,회복분지연화과정;종합고필불동시기경원암특정、류체세장급주요수도층수도물성분포,대주요성장기적유기운취과정진행료모의분석,총결료시북연유기성장적주공인소급성장규률.연구결과표명,중신세시연구구주라계경원암주요적생유기,생배운량균족구봉부,단저시새십등요함지시일리평요함적북부사파,구조권폐주요재분지변연,상당대부분적유도운이도분지변부,가능재후기적구조변동중일산;상신세이래적만성장기,연구구경원암이생기위주,저시구조권폐발육,천연기성장조건구비,분지심층구조권폐역우형성교대규모저삼기장.도6삼62
Studies were conducted on the dynamic processes of hydrocarbon migration and accumulation in the west part of the northern margin of the Qaidam Basin, based on previous studies on basin evolution and hydrocarbon system. Based on the dynamics of petroleum accumulation, basin analysis and the numerical stimulation method were applied to reconstruct the basin evolution. Simulation analysis of petroleum accumulation in the main reservoir-forming stages were conducted in the light of source rock properties in different stages, fluid potential field and physical property distribution of carrier beds. Controlling factors of reservoir formation in the northern margin of the Qaidam Basin were summarized. Studies showed that the Miocene is the main period of oil generation for the Jurassic source rocks in the studied area. The oil generation and migration volume were large. However, Saishiteng Sag was just on the slope in the northern part of Yiliping Sag. Structural traps were distributed at the margin of the basin. There was abundant oil migration to the north margin and a dissipation of the oil there during the later strong tectonic activities. During the late reservoir formation stage after the Pliocene, the source rocks generated mainly gas and not oil, and structural traps were well developed and provided good conditions for the natural gas reservoir formation. Deep structural traps in the basins were conducive to the formation of a large-scale low-permeability gas reservoir.