库车坳陷克拉苏构造带油气源断裂变换构造对油气的控制作用

发布时间：2018-04-14 21:17

本文选题：前陆冲断带 + 油气源断裂　；参考：《地质科技情报》2017年03期

【摘要】：油气源断裂是油气垂向运移的主要通道,其输导能力受自身的活动性所制约。只有在成藏关键时期活动,沟通有效的烃源岩及储层,且具有顶封能力的断裂,才能为油气的运移提供优势输导通道,使成熟烃源岩排出的大量油气能够向储层中运聚成藏。近年来,越来越多的勘探证实油气并非是围绕着整条油气源断裂分布,而是集中分布在断裂走向拐点、断裂交汇部位及断裂末端等变换构造发育的部位。变换构造发育的部位应力集中,易引发地震,地震活动会进一步激发流体运移。结合目前变换构造发育位置通常与油气分布关系密切这一现象,认为油气源断裂上变换构造发育的部位为油气的优势运移通道。以塔里木盆地库车坳陷克拉苏构造带为例,从变换构造的形成机制出发,结合坳陷内断裂的几何学特征及分布规律,将变换构造划分为4种类型:趋近型、转换斜坡型、传递断层型和撕裂断层型。在厘定油气源断裂的基础上,利用油气源断裂的断距-距离曲线等方法识别断裂上变换构造发育的部位,并结合油气藏分布规律,分析油气源断裂变换构造对油气成藏的控制作用。
[Abstract]:Hydrocarbon source fault is the main channel of oil and gas vertical migration, and its transport ability is restricted by its own activity.Only when the hydrocarbon source rocks and reservoirs are communicated effectively during the key period of reservoir formation, and the faults with top sealing ability can provide an advantageous channel for oil and gas migration and migration, so that a large amount of oil and gas discharged from mature source rocks can be transported to the reservoir to form reservoirs.In recent years, more and more exploration has proved that oil and gas are not distributed around the whole hydrocarbon source fault, but are concentrated in the fault strike inflexion, the fault intersection and the fault end, etc.The stress concentration in the transposed structure is easy to cause earthquakes, and seismic activity will further stimulate fluid migration.In view of the fact that the location of tectonic development is usually closely related to the distribution of oil and gas, it is considered that the position where the transformed structure develops on the source fault of oil and gas is the dominant migration channel of oil and gas.Taking the Klassou structural belt of Kuqa depression in Tarim Basin as an example, based on the formation mechanism of the transformation structure, combined with the geometric characteristics and distribution law of the internal faults in the depression, the transformation structures are divided into four types: approaching type, transforming slope type, and so on.Transfer fault and tear fault.On the basis of determining oil and gas source faults, the fault distance curves of oil and gas source faults are used to identify the location of the structural changes on the faults, and the distribution law of oil and gas reservoirs is combined.The controlling effect of oil and gas source fault transformation structure on oil and gas accumulation is analyzed.
【作者单位】：东北石油大学CNPC断裂控藏研究室;东北石油大学黑龙江省科技创新团队"断裂变形、封闭性及与流体运移";东北石油大学"非常规油气成藏与开发"省部共建国家重点实验室培育基地;东北石油大学地球科学学院;大庆油田有限责任公司第六采油厂试验大队;大庆油田有限责任公司第一采油厂第五油矿;大庆油田有限责任公司第三采油厂;
【基金】：国家自然科学基金重点联合基金项目(U1562214) 国家科技重大专项(2016ZX05003-002) 黑龙江省自然科学基金项目(QC2013C041)
【分类号】：P618.13

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