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根据气源对比研究,认为该区气藏的主要气源岩为寒武系烃源岩.在烃源岩演化和构造演化研究的基础上,结合该区气藏储层沥青薄片分析和流体包裹体均一温度研究,认为气藏主要有3个形成期.第1期为晚加里东期,寒武系烃源岩生成的油通过断层以液相形式向上运移至奥陶系碳酸盐岩储层中聚集,成藏后由于地壳抬升,该油藏被破坏;第2期为晚海西期,寒武系烃源岩到生凝析气阶段,由于断裂活动切穿至二叠系,烃类以液相形式进入奥陶系储层,可能圈闭条件不好,没有大规模成藏;第3期为喜山期,由于挤压应力的作用,和田河气田两侧断裂活动剧烈,形成现今的断垒构造,寒武系烃源岩到生干气阶段,烃类以气相形式向上运移至奥陶系和石炭系储层,形成现今的大气藏.
According to the comparison of gas sources, it is considered that the main gas source rocks of the gas reservoirs in this area are Cambrian source rocks. Based on the study of evolution and tectonic evolution of source rocks, combining with the analysis of bitumen flakes and fluid inclusions According to the study of body homogenization temperature, it is concluded that there are mainly three gas accumulation periods: the first is late-Caledonian, and the oil generated from Cambrian source rocks migrates upward through the fault in liquid phase to the Ordovician carbonate rocks Reservoirs. After the accumulation of the crust, the reservoir was destroyed due to the uplifting of the crust. The second stage was Late Late Hercynian and Cambrian source rock to the raw condensate gas phase. Due to the fault activity, the reservoir was cut through Permian, Hydrocarbons enter the Ordovician reservoirs in the form of a liquid phase, which may be trapped in poor conditions and lack of large-scale reservoir formation. The third period is the Himalayan period. Due to the compressive stress, the fracture activity on both sides of the Hetianhe gas field is drastic, The present fault basement structure, Cambrian source rock to raw dry gas stage, hydrocarbon migration in the gas phase up to the Ordovician and Carboniferous reservoirs, the formation of today’s atmosphere.