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为了明确富油凹陷洼槽区古压力演化特征,以冀中坳陷饶阳凹陷为研究对象,运用录测井、试油等资料,在现今地层压力研究的基础上,采用盆地模拟技术与流体包裹体测温技术相结合定量恢复了不同洼槽古压力演化过程,并探讨了富油凹陷洼槽区古压力演化的影响因素,认为洼槽区古压力演化经历了原始积累—释放—再积累3个阶段,不同阶段不同洼槽古压力演化特征差异明显;源岩生排烃能力控制的生烃增压作用是大规模生排烃时期(12~0 Ma)古压力明显增强的主要原因.结果表明:饶阳凹陷洼槽区发育东营组—沙一段和沙三段2套压力系统,河间、马西与留西洼槽为上弱下强型,任西洼槽为下强上弱型,其中河间洼槽超压强度最大,压力系数可达1.58.古压力恢复结果表明饶阳凹陷洼槽区成藏期普遍发育超压,最大压力系数可达1.51,相邻构造带发育弱超压,最大压力系数为1.29.洼槽区沉积充填特征决定了不同层系的岩性、厚度与沉积速率等特性,影响了欠压实增压机制对超压的贡献大小;大规模生排烃时期异常压力快速积累,洼槽区古压力变化率fVR随生排烃量差值增大而提高,马西洼槽fVR可达0.030 Ma-1.
In order to clarify the evolution of paleo-pressure in depression-rich depression, taking Raoyang depression of Jizhong depression as a research object, based on the study of formation pressure at present, using well logging and oil testing data, Based on the combination of temperature measurement and inclusion technique, the evolution of paleo-pressure in different valleys was recovered quantitatively, and the influencing factors of paleo-pressure evolution in the depression of the oil-rich sag were discussed. The paleo-pressure evolution in the valleys underwent the initial accumulation, release and re accumulation There are significant differences in the evolution of paleo-pressure in different stages of the three stages, and the main reason for the significant increase of paleo-pressure during large-scale hydrocarbon generation and expulsion (12 ~ 0 Ma). The results show that two sets of pressure system are developed in Dongying Formation-Sha-1 and Sha-3 Member in the depression depression of Raoyang depression, while the Hejian, Masi and Liuxi depression are weak and strong, while Renxi depression is strong and weak, Among them, the overpressure intensity of the Hejian depression is the largest, with a pressure coefficient of up to 1.58.The results of paleo-pressure restoration show that overpressure is generally developed in the depression area of the Raoyang depression, with a maximum pressure coefficient up to 1.51 and a weak overpressure , The maximum pressure coefficient of 1.2 The sedimentary filling characteristics of the depression area determine the characteristics of lithology, thickness and deposition rate of different strata, which influence the contribution of undercompression pressurization mechanism to overpressure. During the period of large-scale hydrocarbon generation and expulsion, abnormal pressure accumulates rapidly, The fVR of the paleostat in the depression area increased with the increase of the difference between hydrocarbon generation and expulsion, and the fVR in Masai depression could reach 0.030 Ma-1.