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高邮凹陷北斜坡多层位内发育辉绿岩侵入体,使破碎断块区的构造条件、石油地质条件更为复杂,与油气成藏密切相关的辉绿岩的形成时期成为广泛关注的问题。通过对测井资料和地震资料的解释和统计,得出北斜坡辉绿岩测井响应具有低自然伽马、低声波时差、低中子孔隙度、高密度和高电阻率的明显特征,地震剖面上表现为低频率、强振幅、连续性好等特征。在识别解释资料的基础上,结合相应时期的断裂展布情况,分析认为上套辉绿岩平面上展布范围比较集中,主要沿北东向和东西走向的大断层分布,下套辉绿岩展布范围更广,受大断层的转换带控制较为明显。以同位素测年为依据,综合考虑上下两套辉绿岩的展布范围、厚度分布特征以及不同期次构造活动强度等因素,分析认为该区上套辉绿岩形成于三垛运动期,下套辉绿岩在吴堡运动期和三垛运动期均有形成。
The development of diabase intrusions in the multi-layered site of northern slope of the Gaoyou sag makes the tectonic and petroleum geologic conditions of the crust faulted zone more complicated. The formation period of diabase, which is closely related to hydrocarbon accumulation, has become a widespread concern. Through the interpretation and statistics of logging data and seismic data, it is concluded that the diabase log response in the northern slope has the obvious characteristics of low natural gamma ray, low acoustic time lag, low neutron porosity, high density and high resistivity. Seismic profiles showed low frequency, strong amplitude, continuity and other characteristics. On the basis of identifying the interpretation data and combining with the fracture distribution in the corresponding period, it is considered that the distribution range of the upper sets of diabase is relatively concentrated, and the faults are mainly distributed along the north-east and east-west faults. The lower sets of diabase Broader distribution range, controlled by the transformation of large faults is more obvious. Based on the isotope dating, taking into account the distribution range, thickness distribution characteristics and the intensity of tectonic activity of the two diabase sets, the authors consider that the diabase formed in the period of three stacks of movement Set of diabase in Wubao movement period and three stack movement period have formed.