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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。
The Yong’an Town area is rich in oil reservoirs. The fault not only controls the formation of structural belts, but also plays a crucial role in the hydrocarbon accumulation and accumulation. Based on the study of a large number of seismic and core data, the development characteristics of the main fault are analyzed. Combined with the fuzzy comprehensive evaluation of the fault activity rate and the closure of different parts of the fault in different geologic periods, the oil and gas transport in different parts of the main fault Conducting capacity analysis, a clear research area fault and hydrocarbon accumulation. The results show that the active period of the eastern segment of Yong 3 fault and the eastern segment of Yong 41 fault is similar to that of hydrocarbon generation and expulsion period, but the seal is good, which is unfavorable for lateral oil and gas transportation. The western segment of Yong 3 fault and Yong 41 fault west Segment and Yong67 fault have long duration and good matching with hydrocarbon generation and expulsion period, and have poor sealing ability, which can provide migration channel for the lateral migration of oil and gas. It is a favorable area for oil and gas accumulation in the study area. The combination of main faults and the differences of their conductivity and sealing make the distribution layers of oil and gas reservoirs in the study area turn from south to north in sequence and form a stepped hydrocarbon accumulation pattern.