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Geostress logging evaluation method of tight sandstone based on transversely isotropic model
Author(s): 
Pages: 707-714
Year: Issue:  6
Journal: Acta Petrolei Sinica

Keyword:  tight sandstoneP-and S-wave velocitydynamic and static modulus conversiontransversely isotropicgeostress;
Abstract: 中国致密砂岩储层属陆相成因,在成岩过程中不但存在组成矿物定向引起的内在各向异性,也存在板状层理、交错层理或成分层等引起的各向异性.常规基于各向同性模型的地应力计算方法已不适用,需要建立适用于致密砂岩性质的新模型.通过对松辽盆地全直径致密砂岩进行不同方向取心,测量了不同岩心不同方向的纵、横波速度,实验结果表明,致密砂岩具有横向各向同性性质,进一步建立了基于横向各向同性特征的弹性系数表征方法.将岩心应力应变实验与声波实验相结合,建立了适用于目标区的动、静态模量转换模型,并将其应用于基于横向各向同性模型的致密砂岩地应力测井评价中.应用结果表明该模型与压裂结果一致,能更好地反映实际地层情况.
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