被断裂破坏泥岩盖层封闭性演化史恢复方法及其应用

发布时间：2018-02-27 18:35

本文关键词： 泥岩盖层断裂破坏封闭性演化史恢复方法石油地质　出处：《地球科学》2017年09期 　论文类型：期刊论文

【摘要】：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.
[Abstract]:Previous studies on the sealing of mudstone caprock have not considered the degree of failure of the fault, and the study of the history of the sealing of mudstone caprock which has been destroyed by the fault has not been reported in the literature. These problems are very important for oil and gas exploration in fault development area of oil-bearing basin. Based on the study of sealing mechanism and seal evolution characteristics of mudstone caprock destroyed by fault, By comparing the fracture thickness of mudstone caprock with the minimum fracture thickness required for sealing oil and gas, the seal of fractured mudstone caprock can be divided into two types: unfractured and fractured mudstone caprock seal. Through the recovery of paleo-displacement pressure of mudstone caprock and fault rock, the time of formation of sealing ability of mudstone caprock, the time of compaction diagenesis of fault rock and the time of formation of sealing ability are determined. A set of restoration methods for sealing evolution history of fractured mudstone caprock is established. It has been applied to the restoration of the sealing history of mudstone caprock in the eastern member of the second member of the eastern member of the Bohai Bay basin. The results show that the seal of mudstone caprock in the eastern member of the second member of the Bohai Bay basin has not been destroyed by the fault at the point of the survey line of L1, L3, L4, L5, L6, L7, and L9, of which the f2 fault did not break the seal of mudstone caprock in the eastern member. The mudstone caprock is still closed in the eastern member of the second member, and its sealing evolution has gone through the stage of unsealing and sealing. At present, the f2 fault has destroyed the sealing of mudstone caprock in the L2 and L8 survey lines, which is the sealing of f2 fault fault rock. The evolution of its sealing ability has experienced three stages of compaction, diagenesis, diagenesis and diagenesis. It is beneficial to the accumulation and preservation of oil and gas in the reservoir beneath the mudstone caprock of the second member of the eastern member, which is consistent with the distribution of oil and gas found in the reservoir beneath the mudstone caprock of the second member of the eastern member. It shows that this method is feasible to recover the seal evolution history of fractured mudstone caprock.
【作者单位】：东北石油大学地球科学学院;
【基金】：国家自然基金项目(No.41372153)
【分类号】：P618.13

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