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断裂是油气运移的主要通道之一,断裂带岩石中的包裹体可以反映流体当时的物化性质及断裂性质。通过对断裂带中流体包裹体成分及镜下特征的研究可以判断断裂的力学性质;利用包裹体均一温度可以判断断裂带内流体活动时期,达到间接判断断层的活动期次。以平南油田平南断裂中流体包裹体的分析测试为例,通过研究,表明平南断裂是一条经历了正、反转运动的复杂断裂;均一温度测试表明,平南断裂带中有2期油气运移事件发生,对应的温度分别为60~85℃和90~120℃,并对应着断裂2个期次的活动。
Faults are one of the main channels for oil and gas migration. Inclusions in the fault rocks can reflect the physical and chemical properties and fracture properties of the fluids at that time. By analyzing the composition and microscopic characteristics of fluid inclusions in the fault zone, the fracture mechanics can be judged. Using the homogenization temperature of the fluid inclusions, the period of fluid activity in the fault zone can be judged, and the activity period of the fault can be judged indirectly. Taking the analysis and test of fluid inclusions in Pingnan fault of Pingnan oilfield as an example, the study shows that Pingnan fault is a complex fault subjected to positive and reverse movement. Homogenization temperature tests show that there are 2 phases in Pingnan fault zone Hydrocarbon migration events occurred, the corresponding temperatures were 60 ~ 85 ℃ and 90 ~ 120 ℃, and corresponds to the fracture of the activities of two periods.