准噶尔盆地车排子凸起隐蔽油气藏成藏机理

综合运用地质、地球物理、油气藏地球化学及盆地模拟领域中先进的技术与研究方法,以盆地演化和流体输导格架为成藏背景,从有效烃源岩及其生排烃历史出发,以能量场演化及其控制的化学动力学、流体动力学和运动学过程为核心,探讨了准噶尔盆地车排子凸起隐蔽油气藏的成藏机理.研究表明,油气藏主要以昌吉凹陷二叠系和四棵树凹陷侏罗系油气2期充注混源而成,油气分别以早期净浮力、晚期强超压为驱动机制,以不整合/区域性砂体、构造断裂为优势运移通道构成2源2期充注、阶梯式输导、地层/岩性型聚集的成藏模式.

Study on the formation mechanism of the subtle oil/gas reservoirs in Chepaizi uplift,Junggar Basin

As petroleum exploration goes into a more mature stage,the search for subtle oil/gas reservoirs gradually becomes a main direction of oil/gas resource stratagem and the frontier area of petroleum geology research in China.The petroleum generation,migration and accumulation mechanism of Chepaizi uplift in Junggar Basin are discussed.Based on the analysis of the evolution histories of the basin,conduit frame work and potent source-rock,not only are the evolution of the energy fields but also the chemical dynamics,the fluid dynamics and kinematics controlled by the evolution of the energy fields studied by integrating geological,geophysical and geochemical means with basin simulation techniques.Detailed oil-to-source correlation showed that the oil/gas mainly originated from Permian dark mudstones in Changji sag and Jurassic coal seam in Sikeshu sag in turn.The driving mechanisms of hydrocarbon migration took on two modes of early buoyancy and late strong overpressure.Unconformities/ connected sand-bodies,faults formed dominant migration pathways.The accumulation models of subtle oil/gas reservoirs were attributed to two-source generating,two-stage charging,"stair-shaped" conduit and stratigraphic/lithologic traps accumulation.