断裂带内部结构及其对油气运聚的控制作用——以准噶尔盆地北缘哈山构造带为例

Quantitative evaluation of the transportation of fault zone and its controlling effect on hydrocarbon migration and accumulation:Case study of Hala'alat Mountain tectonic belt in the north margin of Junggar Basin

断裂带内部结构对油气运聚的控制作用是哈山构造带成藏研究的薄弱环节。基于野外露头、钻井岩心和(成像)测井、薄片等资料开展断裂带结构层识别与划分,建立了火山岩区逆断层断裂带结构模型。断裂带结构观测统计与伴生裂缝充填脉体包裹体均一温度、碳氧锶同位素地球化学测试分析认为,断裂一般经历破裂、碎裂和碎裂流作用,由二维断层面逐渐演化为三维地质体,呈由内向外"扩展式"发育特点。通过对油气藏与探井油气水空间分布关系解剖,探讨了断裂带内部结构对油气运聚成藏的控制作用。断裂带"四维"属性控制了油气输导方式的转换、幕式输导时限和差异运聚成藏,在断层活动期与停止活动后至完全充填胶结之前的2.9～9.8Ma时间内破碎带和诱导裂缝带具有良好的输导性,推覆体浅部与中—高角度推覆断裂对接,且具有良好盖层的圈闭与深部中—低角度推覆断裂下盘圈闭为油气的有利聚集部位。

The ana is the weak point outcrops, dr was identified lys of is of the controlling effect hydrocarbon accumulation ng cores, （imaging and divided, and th of the fault zone internal structure on oil and gas migration in Hala＇alat Mountain tectonic belt.According to the data of ） logging and rock slice microscopy, the internal structure of fault zone e reverse fault zone structure model in volcanic rock area was established. Based on the fault zone structural occurrence measurement, homogenization temperature of fluid inclusions,the carbon,oxygen and strontium isotope geochemistry,the results show that the evolution model of fault zone is from two-dimensional fault plane to three-dimensional geological body step by step, which extended from the inside to outside. The spatial heterogeneity of fault zone, the difference of evolution and reservoir forming geological conditions ,which is the ＂four-dimensional＂ attribute of the fault.The relation-ship between reservoir and well is dissected,and the controlling effect of internal structure of fault zone on hydrocarbon migration and accumulation is discussed.Conversion of oil and gas transmission, the periodicity and timeliness of the transport, and the hydrocarbon accumulation in different partsare controlled by the characteristics of fault zone,which is the ＂four-dimensional＂ attribute of the spatial heterogeneity and the time evolution differences.The fractured zone and induced fracture zone have good conductivity during the period of active fault and after stopping activities to quite a long time （2.9-9.8Ma） before complete filling cementation.The trap juxtaposition or direct linked with mid-high angle fault in shallow and the trap of low-mid angle thrust fault footwall in deep are the favorable exploration targets.