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在不整合输导模式研究的基础上,定量表征了不整合输导油气能力。不整合主要通过水进层的连通孔隙系统和半风化岩石层的孔—缝系统输导油气,平面上存在发散运移和汇聚运移2种模式,垂向上则存在顺层运移和窜层运移2种模式。不整合输导油气能力主要受不整合类型、不整合结构及其物性、不整合面倾角、不整合交会叠置程度、不整合发育规模、源储距离、油气黏度以及油气运移动力等因素的共同影响。基于达西定律,综合各项影响因素,建立了具有实际地质意义的不整合输导油气能力定量表征公式,并利用该公式对渤海湾盆地冀中坳陷廊固凹陷大柳泉构造古近系沙三段与沙四段之间不整合的输导能力进行了评价。结果表明,该不整合输导油气能力具有自大兴断层至牛北斜坡带逐渐增强的变化规律,且存在3个优势运移路径,这些路径上的地层圈闭可作为有利的勘探目标。定量评价结果与实际地质情况具有较好的吻合性,表明所建立的不整合输导油气能力定量表征方法具有较好的适用性。
Based on the research of unconformity conduction mode, the capacity of unconformity conduction oil and gas is quantitatively characterized. There are two modes of divergent migration and convergence migration in the unconformity, which are mainly through the connectivity pore system of the water layer and the pore-seam system of the semi-weathered rock layer. There are two kinds of modes of vertical migration and migration Move 2 modes. The ability of unconformity to transport hydrocarbon is mainly affected by factors such as unconformity type, unconformity structure and its physical properties, unconformity inclination, unconformity intersection degree, unconformity development scale, source-reservoir distance, oil-gas viscosity and hydrocarbon migration motive force Combined effect. Based on Darcy’s law and comprehensively considering various influencing factors, a quantitatively characterization formula of unconformity conductivity for oil and gas with practical geological significance is established. Based on the Darcy’s law, Conductivity of the unconformity between the three sections and the fourth section of Shahe was evaluated. The results show that the unconformity of hydrocarbon migration and transport capability has a gradual increasing rule from the Daxing fault to the Niubei slope, and there are three dominant migration paths. The stratigraphic traps on these paths can be used as favorable exploration targets. The results of quantitative evaluation are in good agreement with the actual geological conditions, indicating that the established method of quantitative characterization of unconformity and conductivity is of good applicability.