【摘要】 永安镇地区油藏丰富,断层不仅控制着构造带的形成,而且对油气的运聚成藏也起到非常关键的作用。在对大量地震及岩心资料研究的基础上,对主干断层的发育特征进行了分析;并结合断层活动速率及断层不同部位在不同地质时期封闭性的模糊综合评价,对主干断层不同部位的油气输导能力进行分析,明确研究区断层与油气成藏的关系。结果表明,永3断层东段和永41断层东段的活动时期与生、排烃期相匹配,但封闭性好,不利于油气的侧向输导;永3断层西段、永41断层西段及永67断层的活动持续时间长,与生、排烃期具有良好的匹配关系,且封闭性差,可以为油气的侧向运移提供运移通道,是研究区油气成藏的有利地区。主干断层的组合方式及其输导性和封闭性的差异使研究区油气藏的分布层位由南向北依次变浅,形成了阶梯状的油气成藏模式。更多还原

【Abstract】 In oil-rich Yongan area, the faults have not only controlled the forming of structure belt, but also played an important role in hydrocarbon migration and accumulation. Based on abundant seismic data and lithology materials, this paper analyzed the feature of major faults. In addition, by combining with fault activity rate analysis and fuzzy comprehensive sealing evaluation in different places of the main faults, the transporting capacity of the main faults in different places is analyzed and the hydrocarbon accumulation regularity is summarized. The results show that east section of Yong3 fault and Yong41 fault, whose activity matches well with the hydrocarbon generation and expulsion periods, but the good sealing property is against the migration of hydrocarbon. The west section of Yong3 fault and Yong41 fault, Yong67 fault which have long active time and match well with the hydrocarbon generation and expulsion periods, and the sealing is poor and making hydrocarbon migration possible, so it is the key regions of reservoir formation. Besides, the three parallel aligned main faults make the reservoir formed in step in the study area, and making the hydrocarbon distribution become shallow gradually from south to north.更多还原