致密砂岩储层速敏效应形成机理及其分布规律研究——以库车坳陷东部阿合组为例

库车坳陷东部下侏罗统阿合组是典型的致密储层，由于储层自身（特）低孔（特）低渗的物性特征，极易引发较强的敏感性。本文通过岩石薄片和扫描电镜的显微观察，结合X衍射测试分析和致密储层敏感性流动实验评价，从运移微粒的成因、 含量和孔喉特征等角度，分析了研究区产生速敏效应的内在因素； 结合速敏效应的实验评价，梳理引发研究层段速敏效应平面差异的主控因素，认为研究层段内广泛发育由刚性颗粒崩解而形成微小颗粒的含量以及孔喉大小和连通性好坏，是造成上述速敏效应平面差异的主控因素。通过对研究区速敏效应形成机理的具体分析和评价，为下一步的钻探和开采提供了切实可行的储层保护和改造建议。

The formation mechanism and distribution of velocity sensitive effect in tight sandstone reservoir: Taking Ahe Formation in East Kuqa depression,Tarim Basin,as an example

As the typical tight sandstones in the eastern Kuqa depression,Jurassic Ahe Formation reservoir is subject to a considerable variety of formation damage. X-ray diffraction and formation damage evaluation of the sandstones samples were tested on the basis of observation in microscope and SEM. Internal factors being responsible for velocity sensitivity,such as cause and content of migration particle and characteristics of pore throat in the reservoir,were analysed. The analysis reveals serious velocity sensitivity in the reservoirs are due to three main controlling factors,including the content of tiny particle result from crash of brittle grain,size and connectivity of pore throat.