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利用测井、岩心、薄片及孔渗数据,对库车前陆冲断带白垩系巴什基奇克组砂岩储层特征进行垂向对比分析发现,由上到下,储层物性显著变差。通过分析构造应力与成岩作用及储层物性之间的关系表明,构造挤压作用下,地层褶皱变形,由上到下,从局部张应力过渡为压扭应力,应力值逐渐增大;上部发育张裂缝,裂缝数量多、开度大,下部发育剪裂缝,裂缝数量少、开度小;受构造应力与裂缝影响,由上到下,储层压实增强,压实减孔量相差2%~3%,溶蚀变弱,溶蚀增孔量相差1%~2%,从而造成储层物性垂向分异。因此,储层垂向差异分布受构造挤压显著控制。认识构造挤压对储层垂向分布的控制,对深入理解成岩控制因素及预测挤压型盆地有利储层发育层段均具有重要意义。
Using logging, core, thin slice and pore permeability data, a vertically contrasted analysis of Cretaceous sandstone reservoir characteristics of Cretaceous Bashijiqike Formation in Kuqa foreland rupture zone shows that from top to bottom, reservoir physical properties significantly deteriorate . By analyzing the relationship between tectonic stress and diagenesis and reservoir physical properties, it shows that under the tectonic compression, the formation folds deform, from top to bottom, and from the local tensile stress to compressive and torsional stress, the stress value gradually increases; Zhang cracks, the number of cracks, large opening, the lower development of shear cracks, the small number of cracks, opening small; affected by tectonic stress and cracks, from top to bottom, reservoir compaction enhanced compaction of the hole difference of 2% ~ 3%, the dissolution is weakened, and the amount of dissolved pores increases by 1% ~ 2%, resulting in vertical differentiation of reservoir properties. Therefore, the vertical difference in reservoir distribution is significantly controlled by tectonic compression. Understanding the control of tectonic extrusion on the vertical distribution of reservoirs is of great significance for understanding the diagenetic control factors and predicting the favorable reservoirs in the extrusion-type basins.