论文部分内容阅读
前人研究泥岩盖层封闭性时并没有考虑断裂的破坏程度,且对已被断裂破坏泥岩盖层封闭性演化史的研究目前尚未见到文献报道,而这些问题对含油气盆地断裂发育区油气勘探至关重要.在被断裂破坏泥岩盖层封闭机理及其封闭演化特征研究的基础上,通过比较泥岩盖层断接厚度与其封油气所需的最小断接厚度的相对大小,将被断裂破坏泥岩盖层封闭分为未被断裂破坏和已被断裂破坏泥岩盖层封闭2种,并通过泥岩盖层和断层岩古排替压力恢复,确定泥岩盖层封闭能力形成距今时间、断层岩开始压实成岩距今时间和封闭能力形成距今时间,建立了一套被断裂破坏泥岩盖层封闭性演化史的恢复方法,并将其应用于渤海湾盆地南堡5号构造被f2断裂破坏东二段泥岩盖层封闭性演化史的恢复中.结果表明:在L1、L3、L4、L5、L6、L7和L9测线处,f2断裂未破坏东二段泥岩盖层封闭,仍是东二段泥岩盖层封闭,其封闭性演化经历了不封闭和封闭阶段,目前具有较强的封闭能力.在L2和L8测线处f2断裂已破坏了东二段泥岩盖层封闭,为f2断裂断层岩封闭,其封闭能力演化经历了压实不封闭、成岩不封闭和成岩封闭3个阶段,目前也已具较强封闭能力,均有利于油气在东二段泥岩盖层之下储层中聚集与保存.与目前东二段泥岩盖层之下储层中已发现油气分布相吻合,表明该方法用于恢复被断裂破坏泥岩盖层封闭性演化史是可行的.
Previous studies of mudstone caprock closure did not consider the extent of fracture damage, and have not been reported in the literature for the study of the evolutionary history of mudstone caprock that has been fractured and destroyed. These problems have not been reported in oil and gas reservoirs Exploration is crucial.On the basis of the research on the sealing mechanism and the sealing evolution characteristics of mudstone caprock by fracture and failure, the relative size of mudstone caprock thickness and the minimum fracture thickness required for hydrocarbon plugging will be destroyed by fracture Mudstone caprock closure is divided into two types, which are not ruptured and have been closed by mudstone caprock, and have been closed by mudstone caprock and fault rock. The sealing ability of mudstone caprock is established and the fault rock begins A new method of recovering the closed evolution history of mudstone caprock fractured by fracturing was established and the application of this method to the reconstruction of Nanpu 5 structure in the Bohai Bay Basin was destroyed by f2 fracture The results show that the f2 fault did not destroy the mudstone caprock of the second member of the Second Member at the line L1, L3, L4, L5, L6, L7 and L9, Is the second member of the mudstone caprock of the second member of the East China Sea and its closed evolution has experienced a non-closed and closed stage and currently has a strong sealing capability. The f2 fracture at the L2 and L8 survey lines has damaged the mudstone caprock of the second member of the East Second Member, F 2 faulted fault rocks are closed, their sealing ability evolves under three stages of compaction and non-sealing, diagenesis non-sealing and diagenetic sealing. At present, it has strong sealing ability, which is favorable for oil and gas to be stored under the mudstone cap of East Second Member Which is consistent with the distribution of oil and gas in the reservoirs below the mudstone caprock in the second member of the East Second Member, indicating that this method is feasible for recovering the closed evolutionary history of the caprock that was fractured and destroyed.