摘要
依南构造侏罗系埋深大于3000m,处于异常高压体系下,下侏罗统发育天然气气藏。侏罗系纵向上储盖组合发育,具有良好的封闭性,横向上边界断层亦具有良好的封闭性。据泥岩声波时差测井资料和泥岩实测孔隙度分析,地层为正常压实,对异常高压的形成无明显影响。气态烃的生成使地层孔隙流体体积增大,长石伊利石化使地层固体体积增大,构造抬升使地层维持原始地层压力,因此,控制依南构造带侏罗系异常高压形成的主要因素为构造抬升作用、气态烃的生成作用及长石伊利石化作用。
The Jurassic in Yinan structural zone with a buried depth over 3000m is in an abnormal high pressure system and gas accumulations develop in the Lower Jurassic. Vertically, the Jurassic has well developed combination of reservoir and seal with good sealing capacity; laterally, the boundary faults also have good sealing capacity. Logging data of interval transit time of mudstone and analysis of the real porosity of mudstone reveal that the formations are normally compacted and have no significant impacts on abnormal high pressure. Generation of gaseous hydrocarbons enlarges the volume of pore fluid in the strata, transform of feldspar to illite enlarges the solid volume of the strata, while structural uplift makes the strata maintaining the original formation pressure. Therefore, the main factors resulting in the abnormal high pressure in the Jurassic in Yinan structural zone are structural uplifting, generation of gaseous hydrocarbons and transform of feldspar to illite.
出处
《河南石油》
2004年第2期20-21,24,共3页
Henan Petroleum
关键词
库车坳陷
侏罗系
异常高压
成因
构造抬升
Kuche depression, Jurassic, abnormal high pressure, gensis, structural uplifting
