Hydrocarbon accumulation mechanism near top overpressured surface in central Junggar Basin
Hydrocarbon accumulation mechanism near top overpressured surface in central Junggar Basin
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发表时间：
2011
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通讯作者：
Zhang Pei-zhi
中科院分区：
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作者：
Zhang Pei-zhi
对准噶尔盆地中部超压顶面附近有限区域进行了地球化学、储层、钻井和地球物理特征研究，并分析了成藏机制。烃源岩热演化、输导通道空间组成、超压演化、顶部超压盖层特征以及有利圈闭和油气藏类型与分布等都是准噶尔盆地中部超压顶面附近油气成藏过程和油气成藏区分布的控制因素。准噶尔盆地中部超压顶面附近侏罗系圈闭与超压演化密切相关，经历了两期油气成藏，后期成藏包括两次主要充注，超压流体集中释放区附近的圈闭和超压区室中的优势圈闭是准噶尔盆地中部超压顶面附近的有利勘探目标。
Geochemistry,reservoir,drilling and geophysical features were investigated in the limited zones near the top overpressured surface in central Junggar basin,and the accumulation mechanism were analyzed.The results show that source rocks are in the overpressured compartment,thus the top overpressured surface is both tight-lithostatic and unpermeable seal surface and balance surface of hydrocarbon migration near the top overpressured surface in central Junggar Basin,probably a hydrocarbon-originated and post-diagenesis-stage overpressured basin.The thermal evolution of source rocks,the spatial composition of the transportation pathways,the evolution of the overpressure,the characteristics of the top overpressured seal,and the types and distributions of the advantageous traps and reservoirs,are all the controlling factors of the hydrocarbon accumulation processes and the hydrocarbon accumulation areas distribution near the top overpressured surface in central Junggar Basin.Closely related with the overpressure evolution,the Jurassic traps near the top overpressured surface in central Junggar Basin underwent two stages of hydrocarbon accumulation,and the late stage accumulation includes two main charging.As a result,the traps near the overpressured fluid focus releasing areas,and the advantageous traps in the overpressured compartment,are the advantageous exploration targets near the top overoressured surface in central Junggar Basin.