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研究网毯式油气成藏体系仓储层运移油的机理,揭示断层幕式排烃期仓储层运移油的机理,以油气二次运移理论为指导,开展了油沿断裂纵向运移及油在仓储层内横向运移的定量研究。首先根据地质模型,建立断层内油压力衰减梯度的数学模型,根据能量守恒原理,推导出油沿断层纵向运移的压力梯度公式,计算出油沿断裂进入仓储层的初始压力,再根据仓储层的地质模型,建立油在仓储层内横向运移的压力衰减模型及上网层开启时的泄压模型,推导出油沿仓储层横向运移的压力梯度公式及泄压公式,最终得出仓储层运移油的合力公式。并指出当运移动力大于运移阻力,即运移合力为正时,仓储层以运移油为主,当运移动力等于或小于运移阻力,即运移合力为负时,仓储层以临时仓储(成毯)、成藏为主。通过对运移合力的计算,可以判断油在仓储层内运移、成毯和成藏的状态,预测仓储层运移、成毯或成藏的范围,从而指导该体系隐蔽油气藏的勘探。
This paper studies the mechanism of oil migration in the reservoir of the bedrock-type hydrocarbon accumulation system and reveals the mechanism of migration of oil in the reservoir of the fault-curtain type hydrocarbon generation stage. Guided by the theory of secondary migration of oil and gas, Quantitative Study on Lateral Transport of Oil in Storage. According to the principle of energy conservation, the pressure gradient formula of oil migration along the fault is deduced, and the initial pressure of oil entering the reservoir along the fault is calculated. Based on the mathematical model of the oil reservoir, The paper establishes the pressure decay model of lateral migration of oil in the storage reservoir and the pressure relief model when the access layer is opened and deduces the pressure gradient formula and pressure relief formula of lateral migration of oil along the storage reservoir. Cohesion formula for transporting oil. It is pointed out that when the moving force is larger than the moving resistance, that is, the moving resultant force is positive, the reservoir layer mainly contains moving oil. When the moving force is equal to or less than the moving resistance, that is, the moving force is negative Temporary storage (into a blanket), forming the main reservoir. Through the calculation of resultant forces, the migration, blanket and accumulation of oil in the reservoir can be judged and the range of migration, blanket formation or accumulation of the reservoir can be forecasted to guide the subtle exploration of the reservoir.