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北部单斜带是库车坳陷油气成藏研究程度最低的构造带。基于流体包裹体、定量颗粒荧光和激光拉曼等分析技术对北部单斜带的油气充注史进行详细的研究,并结合生储盖和圈闭条件对其成藏潜力进行了评价。根据其常规孔隙型储层和裂缝储层的岩心样品对比分析表明,孔隙型储层中流体包裹体主要为单相黄色荧光油包裹体,储层QGF指数都大于6,QGF-E强度都大于20pc,油气充注显示出明显的继承性特点;裂缝型储层中包裹体主要为蓝白色荧光固液气三相包裹体和气液两相包裹体,储层QGF指数、QGF-E强度和R1都显示出异常值,与孔隙型储层原油物性具有较大差异,认为储层早期(65Ma左右)经历一期油充注,晚期喜马拉雅造山运动使地层强烈褶皱产生大量裂缝,沟通了其他储层或源岩,使得晚期(10Ma左右)生成的轻质油沿裂缝网络发生一期充注,之后又经历一期(3Ma左右)气洗。研究区生储盖条件匹配良好。烃源岩演化达到主要生油阶段,部分地区的三叠系甚至达到生气阶段。储层物性致密,裂缝控制“甜点”发育,致密油气的勘探具有广阔的潜力。
The northern monocline is the lowest studied structural zone of hydrocarbon accumulation in the Kuqa Depression. Based on fluid inclusions, quantitative particle fluorescence and laser Raman analysis techniques, the history of oil and gas charge in the northern monoclinic zone has been studied in detail, and its potential of hydrocarbon accumulation has been evaluated in combination with the conditions of genesis, reservoir cap and trap. According to the comparison of core samples from conventional porous reservoirs and fractured reservoirs, the fluid inclusions in porous reservoirs are mainly single-phase yellow fluorescent oil inclusions with QGF exponents greater than 6 and QGF-E intensities greater than 20pc, and oil-gas filling showed obviously inherited characteristics. The inclusions in fractured reservoirs are mainly blue-white fluorescence solid-liquid three-phase inclusions and gas-liquid two-phase inclusions. The reservoir QGF exponent, QGF-E intensity and R1 Both show abnormal values, which are quite different from the physical properties of the pore-type crude oil reservoirs. It is considered that an early oil reservoir (about 65Ma) experienced an oil charge and the late Himalayan orogeny resulted in a large number of fractures caused by strong folds in the strata and communicated with other reservoirs Or source rocks, the light oil generated in the late stage (around 10Ma) will be inflated along the fracture network in one stage, and then undergoes one stage (about 3Ma) air wash. The conditions of reservoir and cover in the study area match well. The evolution of source rocks reached the major oil-producing stage, and the Triassic in some areas even reached the stage of gas generation. Reservoirs with tight physical properties, crack control, “sweet spot” development and exploration of tight oil and gas have broad potential.