【摘要】：通過分析準(zhǔn)噶爾盆地南緣下儲蓋組合吐谷魯群蓋層巖性、泥巖累計厚度和泥巖單層厚度等宏觀評價參數(shù)以及滲透率和排替壓力等微觀評價參數(shù),認(rèn)為下儲蓋組合主力蓋層為呼圖壁組,巖性表現(xiàn)為泥巖、粉砂質(zhì)泥巖及泥質(zhì)粉砂巖薄互層,泥地比以80%~95%為主,平均泥巖累計厚度為337 m,泥巖最大單層厚度達(dá)138 m。吐谷魯群泥巖滲透率為(0.000 001 84~0.000 24)×10~(-3)μm~2,排替壓力為4.72~44.85 MPa,根據(jù)國內(nèi)蓋層封閉能力分類評價標(biāo)準(zhǔn)屬Ⅰ-Ⅱ類蓋層。通過恢復(fù)蓋層排替壓力的動態(tài)演化過程,認(rèn)為泥巖封閉能力形成時期與烴源巖生、排烴時期具有較好的匹配關(guān)系,蓋層能夠封閉侏羅系烴源巖生成的石油及晚期生成的天然氣,同時后期抬升運動及喜馬拉雅構(gòu)造活動產(chǎn)生的多條逆沖斷層對蓋層的封閉能力未產(chǎn)生較大影響。綜合分析認(rèn)為,吐谷魯群蓋層具有封閉大中型氣田的能力。
[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 鹵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，

本文編號：2421441