致密砂岩含水饱和度建立新方法-毛管自吸法

为了能够准确模拟原地条件，在岩心中建立所需的含水饱和度并保证水在岩心中均匀分布、不改变岩心的孔隙结构和成分是十分必要的。目前，建立含水饱和度的方法主要有烘干法（或风干法）、离心法和驱替法。鉴于致密砂岩气层岩性致密，并普遍存在超低含水饱和度现象，利用这些方法在致密砂岩岩心中建立低于束缚水饱和度的含水饱和度状态是十分困难的或不现实的,因此提出了一种建立含水饱和度的新方法—毛管自吸法，利用该方法能够在致密岩心中建立所需的含水饱和度，并通过实验证实了该方法是可行的。

New Method of Water Saturation of Tight Gas—Spontanoeus Imbibition

In order to suternarrviondtions, it is necessary that water saturation establishment in cores must be any saturation desired and insure water uniformly dispersed, the pore geometry and component of cores unchanged. At present, there are several mainly methods to establish water saturation such as drying method, centrifuge method and displacement method. Seeing that tight gas sands has tight lithologic character and ultra-low water saturation, it is difficult or impracticable that water saturation estaedghs thse methods is less than irreducible water saturation. The paper puts forward a new method of establishing water saturation called spontaneous imbibition method, it can be used to establish water saturation in tight sandstones and has been proved by experiments to be feasible.