测井-毛管压力法分析非均质油藏油水分布——以胜坨油田二区沙二段8砂层组油藏为例

Analyses on Oil and Water Distribution in Heterogeneous Reservoir by Logging-Capillary Pressure Method——Taking the 8 th Sand Group of S_2 Section in 2 Block of Shengtuo Oilfield as an Example

储层压汞实验数据有限,对于非均质性储层来说实验样品的代表性也受到局限。测井是预测储层物性的有效方法,而毛管压力与储层物性间存在着密切的联系。通过建立起测井与毛管压力的关系,利用已揭示油水界面的钻井资料,建立了非均质油层油水界面的预测方法,即构建了油水界面深度与孔隙度、渗透率的相互关系,并结合对胜坨油田二区沙二段8砂层组油层多口见油水井的测井的数据,对该公式进行了标定和应用,实现了对研究区油水分布特征的预测。研究结果表明:胜坨油田二区8砂层组油层未被完全水淹的油层主要分布于7、9号断层附近的河口坝的顶部、砂坝侧缘沉积,以及正向微型构造内。整体上,二区沙二段8砂层组油层含油面积大幅度减小,含油面积仅为2.78 km^2,占原含油面积的23%左右,含油区不连片,形成了4个相对孤立的含油区,即2312井区、22137-20160井区、21182-21199井区及2326-25276井区。

The reservoir mercury injection experimental data was often limited,and it was also limited the representative of the experimental samples for heterogeneous reservoir.Reservoir physical property can be obtained from the well logging data,while there was a close relationship between capillary pressure and reservoir physical property.The fluids contact estimate approach of the heterogeneous reservoir was built based on the relationship of well logging results and capillary pressure,which contain the correlation of fluids contact,porosity and permeability.That was,combined with the logging data of oil and water wells of the 8th sand group of S 2 section in 2 block of Shengtuo oilfield,the formula was calibrated and applied.Which revealed that the oil zone which is not completely flooded distributed on the top of mouth bar close to the 7 th and 9 th fault,the sandbar margin and the positive microscopic structural.Overall,the residual oil-bearing area was reduced greatly,which was 2.78 km 2,account for 23%of the original oil-bearing area.There was 4 isolated oil-bearing blocks,which include 2312 block,22137-20160 block,21182-21199 block and 2326-25276 block.