大型控盆边界正断层活动性评价方法及应用

发布时间：2018-03-23 12:14

本文选题：主边界正断层　切入点：评价方法　出处：《断块油气田》2017年03期

【摘要】：裂陷区存在大量缺失下盘地层沉积的控盆主边界正断层,这类断层的运动学特征对认识盆地的结构、沉积充填及油气成藏都具有重要意义。然而目前还没有一种有效的该类断层活动性评价方法,为此,以油区构造解析理论为指导,在已有断层活动性评价方法调研基础上,通过断裂活动与沉积充填响应关系的系统分析,提出了一种新的评价方法——地层楔形体法。断层的活动过程是上盘楔形地层超覆体的形成过程,某一地质时期内,因断层活动的阶段性而发育多个地层楔形体,所有地层楔形体的视厚度就代表了地层沉积时期的断层活动产生的垂距。文中将地层楔形体法应用于沙南—埕北地区,对缺失下盘地层沉积控盆边界断层的活动性做了评价,明确了沙三段沉积时期断层活动强烈。
[Abstract]:There are a large number of normal faults along the main boundary of the controlled basin in the rift area, which are not deposited in the bottom of the basin. The kinematic characteristics of these faults are helpful to understand the structure of the basin. Depositional filling and hydrocarbon accumulation are of great significance. However, there is no effective method for evaluating the activity of this kind of faults. Therefore, based on the analytical theory of oil structure, and based on the investigation and investigation of existing methods for evaluating fault activity, Based on the systematic analysis of the relationship between fault activity and sedimentary filling response, a new evaluation method, the formation wedge method, is proposed. The active process of the fault is the formation process of the upper wedge overburden, and in a certain geological period, Because of the stage of fault activity, many stratigraphic wedges are developed, and the apparent thickness of all the wedges represents the vertical distance produced by fault activity during the sedimentary period. In this paper, the method of stratigraphic wedge is applied to the area of Shannan to Chengbei. The activity of sedimentary boundary faults in the depositional control basin of the missing footwall is evaluated and it is clear that the fault activity is strong in the sedimentary period of the third member of the Shahejie formation.
【作者单位】：中海油研究总院;中海石油(中国)有限公司天津分公司;
【基金】：国家科技重大专项课题“大陆边缘盆地类比与油气成藏规律研究”(2011ZX05030-001)
【分类号】：P618.13

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