俄罗斯西西伯利亚盆地托木斯克州X区块储层测井解释评价研究

Research on logging interpretation and evaluation of reservoirs in Block X,Tomsk Prefecture,West Siberian Basin,Russia

西西伯利亚盆地属中、新生代年轻地台,属中、新生代年轻地台。盆地发育中下侏罗统、上侏罗统、下白垩统和上白垩统四套含油气组合。X区块构造位置位于亚历山大隆起带特拉伊戈罗中型长垣的西南斜坡上。目前已发现的油藏有白垩系的Б9油藏、侏罗系的Ю_(1-1)、Ю_(1-2)、Ю_(1-3)和上古生代М背斜构造和构造层状油藏。储层主要为砂岩和碳酸盐岩储层。通过开展测井解释工作,主要应用自然伽马(GR)曲线法进行泥质含量(Vsh)计算,没有GR曲线的井则选用自然电位曲线计算。利用俄方提供的自然电位曲线计算模型进行有效孔隙度(PHIE)计算。采用俄方通常采用的可动孔隙度法确定有效孔隙度下限值。利用自然电位幅度与电阻率两参数建立X区块各层位油水层解释标准图版。利用X区块建立的测井参数解释模型,中方完成21口井测井处理解释评价工作。总体来看,中方与俄方在有效厚度、孔隙度相差不大,含油饱和度俄方解释为55.7%,中方为50.5%,低于俄方。上述研究成果建立了X区块有效储层的测井解释模型识别方法,为进一步开展X区块储层测井综合评价提供了较为可靠的依据。

The West Siberian Basin belongs to the middle and Cenozoic young platform,and belongs to the middle and Cenozoic young platform.The basin develops four sets of oil-bearing combinations:lower Jurassic,Upper Jurassic,Lower Cretaceous and Upper Cretaceous.Block X is located on the southwest slope of the Traigro medium wall in the Alexander uplift belt.The discovered reservoirs are theБ9 reservoir of Cretaceous,Ю1-1,Ю1-2,Ю1-3 of Jurassic,and the Upper PaleozoicМanticline structural and tectonic layered reservoirs.The reservoirs are mainly sandstone and carbonate reservoirs.Through logging interpretation work,natural gamma(GR)curve method is mainly used for mud content(Vsh)calculation,and natural potential curve calculation is used for Wells without GB curve.The effective porosity(PHIE)was calculated by using the natural potential curve calculation model provided by Russia.The effective porosity lower limit was determined by the movable porosity method usually used by Russia.The standard map of oil and water layer interpretation at each level in block X was established using natural potential amplitude and resistivity.Using the logging parameter interpretation model established in Block X,the Chinese side completed the logging treatment interpretation and evaluation of 21 Wells.In general,there is little difference between China and Russia in the effective thickness and porosity.The Russian oil saturation ratio is 55.7%and China is 50.5%,lower than the Russian side.The above research results established the logging interpretation model identification method of the effective reservoir in Block X,which provides a reliable basis for further comprehensive evaluation of reservoir logging in Block X.