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根据地层压力实测数据和地层压力模拟计算,对饶阳凹陷洼槽区的地层压力分布特征及其成因机制进行研究。结果表明:饶阳凹陷洼槽区古近系普遍发育超压;纵向上,存在东营组、沙一段和沙三段三套超压层系;可划分为单超压结构和双超压结构,其中双超压结构可细分为上强下弱、上弱下强和上下均势3种类型;平面上,超压中心与洼槽沉积中心相吻合,河间和留西洼槽超压幅度最大;从沙三段到沙一段,南部洼槽区超压规模明显减小,北部洼槽区超压规模略增,超压中心具有从南到北的迁移性;东营组超压成因机制主要为欠压实作用,沙一段和沙三段的超压成因机制为生烃作用与欠压实作用的混合增压机制;由于欠压实与生烃两者对超压的贡献比例差异,造就了研究区多种超压结构并存的现状,并影响了油气的空间分布。
According to the measured data of formation pressure and formation pressure simulation, the stratigraphic pressure distribution and its genetic mechanism in the depression area of Raoyang sag are studied. The results show that the Paleogene in the depression depression of Raoyang depression generally developed overpressure. In the longitudinal direction, there are three overpressure strata of Dongying Formation, Shashi Formation and Shahejie Formation. They can be divided into single overpressure structure and double overpressure structure, in which The double overpressure structure can be subdivided into three types, that is, weak on the strong and weak on the weak, weak and strong on the lower and upper and lower potential. In the plane, the overpressure center agrees with the sedimentary center of the depression and the overpressure of Hejian and Liuxi depression is the largest. From Sha 3 to Sha 1, the overpressure scale in the southern depression area decreased obviously, the overpressure scale in the northern depression area slightly increased, and the overpressure center had the migration from south to north. The overpressure mechanism in Dongying Formation was mostly due to The mechanism of overpressure in the first member of Shahejie Formation and that in Shahejie Formation is a mixing and pressurizing mechanism of hydrocarbon generation and undercompaction. Due to the difference of contribution ratio between undercompression and underpressure in both undercompaction and hydrocarbon generation, A variety of super-pressure structure coexist in the status quo and affect the spatial distribution of oil and gas.