塔里木盆地阿克1井二叠纪孢粉地层及其地质意义

阿克 1井是塔里木盆地西南坳陷喀什凹陷乌恰构造带阿克莫木背斜北高点的第一口预探井 ,该井中二叠统比尤列提群 (P2 by)钻厚 2 5 5 .5 0 m(395 4— 4 2 0 9.5 0 m,未钻穿 ) ,为灰褐、灰、深灰色泥岩、粉砂质泥岩与同色灰质泥岩近等厚互层 ,偶夹薄层浅灰、灰色泥灰岩、泥晶含泥灰岩及灰色泥质粉砂岩、粉砂岩 ,产大量孢粉化石 ,可建立Florinites- Protohaploxypinus- Vittatina组合 ,地质时代为中二叠世。该井二叠纪地层的钻揭 ,具有非常重要的地质意义 ,不但完善了该地层小区的地层层序 ,而且丰富了二叠纪的孢粉化石资料 ,填补了该区二叠纪古生物研究的空白 ,还改变了对该区生油条件的评价 ,提高了对该区的含油气远景评价等级。

PERMIAN PALYNOSTRATIGRAPHY OF THE AKE 1 BOREHOLE,TARIM BASIN AND ITS GEOLOGICAL SIGNIFICANCE

The Ake 1 borehole, located the north of Southwest Depression of the Tarim Basin, Xinjiang, is a wildcat well. The Middle Permian Biyoulieti Group (P 1 by ) is 255.50m(3 954～4 209.50m) in drilled thickness and consists of gray brown, gray and dark gray mudstone, silty mudstone and calcareous mudstone with light gray marl and gray shaly siltstone and siltstone. There are much sporopollen in the Biyoulieti Group. One sporopollen assemblage, Florinites Protohaploxypinus Vittatina Assemblage,has been proposed. It indicates a Middle Permian age for the Biyoulietic Group. The drilled Biyoulieti Group of the Ake 1 Borehole is of great geological significance. It not only improves and perfectes the stratigraphic sequence of this area,but also enriches the Permian sporopollen data, filles in the gap in the Permian palaeopalynologic studies,changes the appraisal of the capacity for oil producing, and upgrades the oil and gas prospect evaluation.