断层岩封闭性演化阶段确定方法及其应用

发布时间：2018-02-09 04:57

本文关键词： 渤海湾盆地南堡凹陷古近纪断层岩封闭性演化阶段确定方法压实成岩时间封闭能力形成时间　出处：《天然气工业》2017年10期 　论文类型：期刊论文

【摘要】：为了准确确定断裂的封闭性,在对断层岩形成过程及封闭性演化特征进行研究的基础上,根据断层岩开始压实成岩时间和封闭能力形成时间把断层岩封闭性演化划分为3个阶段:(1)压实不封闭阶段,时间从断裂停止活动至断层岩开始压实成岩;(2)成岩弱封闭阶段,时间从断层岩开始压实成岩至封闭能力形成;(3)成岩强封闭阶段,时间从断层岩封闭能力形成至现今。由此建立了一套断层岩封闭性演化阶段的确定方法,并将其应用于渤海湾盆地南堡凹陷南堡5号构造,以确定该构造内的f_1、f_2、f_3这3条断裂在古近系东营组三段(以下简称东三段)断层岩中的封闭性演化阶段。结果表明:(1)f_1断裂在东三段断层岩封闭性演化目前处于第1封闭性演化阶段,即压实不封闭阶段,不利于油气的聚集与保存;(2)f_2、f_3断裂在东三段断层岩封闭性演化目前均处于第3封闭性演化阶段,即成岩强封闭阶段,有利于油气的聚集与保存。结论认为:该方法确定的结果与目前该构造f_1、f_2、f_3断裂两侧东三段已发现的油气分布规律相吻合,表明采用该方法来确定断层岩封闭性演化阶段是可行的。
[Abstract]:In order to accurately determine the sealing characteristics of faults, based on the study of the formation process and sealing evolution characteristics of fault rocks, According to the time of starting compaction diagenesis and forming time of sealing ability of fault rock, the evolution of sealing property of fault rock is divided into three stages: 1) compaction and no sealing stage, from the time of fault stopping activity to the stage of diagenetic weak sealing of fault rock beginning to compaction diagenesis. The time begins from the fault rock compaction to the formation of the sealing ability to form the diagenetic strong sealing stage, and the time from the fault rock sealing ability to the present day. Therefore, a set of methods for determining the sealing evolution stage of the fault rock are established. It has been applied to Nanbao No.5 structure in Nanpu Sag, Bohai Bay Basin. In order to determine the closed evolution stage of the three faults in the third member of the Dongying formation of the Paleogene (hereinafter referred to as the third member of the eastern third member), the sealing evolution of the fault rocks in the third member of the Dongying formation is in the first place. The results show that the sealing evolution of the fault rocks in the third member of the eastern third member is now in the first place. Closed evolution stage, That is, the compaction and non-sealing stage is not conducive to the accumulation and preservation of oil and gas. The sealing evolution of the fault rocks in the third member of the eastern part is now in the third stage, that is, the stage of strong diagenetic sealing, which is not conducive to the accumulation and preservation of oil and gas. Conclusion: the results obtained by this method are consistent with the oil and gas distribution pattern found in the eastern third member of the f1D / fSZ _ 2fSP _ 3 fault in the present structure, and the conclusion is that this method is suitable for the accumulation and preservation of oil and gas. It shows that it is feasible to use this method to determine the closed evolution stage of fault rock.
【作者单位】：东北石油大学;
【基金】：国家自然科学基金项目“油源断裂转换带优势输导油气条件研究”(编号:41372153)
【分类号】：P618.13

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