准噶尔盆地南缘吐谷鲁群盖层评价及对下组合油气成藏的意义
发布时间：2019-02-13 10:00
【摘要】：通过分析准噶尔盆地南缘下储盖组合吐谷鲁群盖层岩性、泥岩累计厚度和泥岩单层厚度等宏观评价参数以及渗透率和排替压力等微观评价参数,认为下储盖组合主力盖层为呼图壁组,岩性表现为泥岩、粉砂质泥岩及泥质粉砂岩薄互层,泥地比以80%~95%为主,平均泥岩累计厚度为337 m,泥岩最大单层厚度达138 m。吐谷鲁群泥岩渗透率为(0.000 001 84~0.000 24)×10~(-3)μm~2,排替压力为4.72~44.85 MPa,根据国内盖层封闭能力分类评价标准属Ⅰ-Ⅱ类盖层。通过恢复盖层排替压力的动态演化过程,认为泥岩封闭能力形成时期与烃源岩生、排烃时期具有较好的匹配关系,盖层能够封闭侏罗系烃源岩生成的石油及晚期生成的天然气,同时后期抬升运动及喜马拉雅构造活动产生的多条逆冲断层对盖层的封闭能力未产生较大影响。综合分析认为,吐谷鲁群盖层具有封闭大中型气田的能力。
[Abstract]:The macroscopic evaluation parameters, such as the lithology of Tugulu group, the accumulation thickness of mudstone and the single layer thickness of mudstone, as well as the microscopic evaluation parameters such as permeability and displacement pressure, are analyzed in the lower reservoir cap assemblage of Junggar Basin. It is considered that the main caprock of the lower reservoir and caprock assemblage is the Hutubi formation, and its lithology is characterized by mudstone, silty mudstone and shaly siltstone thin interbedded. The ratio of mud to ground is 80% 95%, the average accumulated thickness of mudstone is 337 m, and the maximum monolayer thickness of mudstone is 138 m. The permeability of mudstone in Tugulu group is (0.000 84 卤0.00024) 脳 10 ~ (-3) 渭 m ~ (-3) 渭 m ~ (-2), and the displacement pressure is 4.72 渭 m ~ (-3) 渭 m ~ (-2). According to the classification and evaluation criteria of sealing ability of domestic caprock, it belongs to class 鈪，
本文编号：2421441
[Abstract]:The macroscopic evaluation parameters, such as the lithology of Tugulu group, the accumulation thickness of mudstone and the single layer thickness of mudstone, as well as the microscopic evaluation parameters such as permeability and displacement pressure, are analyzed in the lower reservoir cap assemblage of Junggar Basin. It is considered that the main caprock of the lower reservoir and caprock assemblage is the Hutubi formation, and its lithology is characterized by mudstone, silty mudstone and shaly siltstone thin interbedded. The ratio of mud to ground is 80% 95%, the average accumulated thickness of mudstone is 337 m, and the maximum monolayer thickness of mudstone is 138 m. The permeability of mudstone in Tugulu group is (0.000 84 卤0.00024) 脳 10 ~ (-3) 渭 m ~ (-3) 渭 m ~ (-2), and the displacement pressure is 4.72 渭 m ~ (-3) 渭 m ~ (-2). According to the classification and evaluation criteria of sealing ability of domestic caprock, it belongs to class 鈪，
本文编号：2421441
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