成藏动力对束缚水饱和度的影响

束缚水饱和度是评价油层含油性的重要参数之一。前入研究普遍认为，砂岩储层的束缚水饱和度与砂岩类型、孔隙度和孔隙结构有关，粒度中值和孔隙度的影响最大。笔者认为，束缚水饱和度不仅取决于储层本身，还取决于储层之外的其他因素，其中成藏动力是决定其大小的一个重要因素。砂岩储层为孔隙型储层，它由微孔隙与有效孔隙组成。微孔隙完全被束缚水占据，流体在微孔隙中不能渗流；有效孔隙中充满油、气和水，水又分为可动水与束缚水，束缚水为亲水岩石孔壁及孔角上的薄膜滞留水。当有适当的外力驱动时，这部分束缚水是可以流动的，其含量取决于成藏动力的大小。

The influence of reservoir-forming dynamic on irreducible water saturation

Irreducible water saturation is the water saturation in the oil -producing formation without producing water,which is one of the important parameters for evaluating oil - bearing probability in oil reservoirs. It was generally considered that the irreducible water saturation of sandstone reservoirs was related to the sandstone type,porosity and pore structure,especially median size and porosity. The author puts forward that the irreducible water saturation not only depends on the reservoir itself but also depends on other factors besides reservoirs, and among them the reservoir -forming dynamic is one key factor. Sandstone reservoirs are the pore types composed of tiny pores and effective pores. The tiny pores are completely occupied by the irreducible water in which fluids can not percolate. The effective pores are filled with oil, gas and water( movable and irreducible water). And the irreduci-ble water is the detained water of film on water wetting rock hole walls and at the corner. Only if there was proper outside force driving,could it be moving. The content of the irreducible water depends on the reservoir-forming dynamics.