测井资料在致密砂岩气层产水预测中的应用——以鄂尔多斯盆地L区块为例

Application of well logging data in water yield prediction in tight sandstone reservoirs——Taking block L of Ordos basin as an example

鄂尔多斯盆地L区块部分气井出现不同程度的产水情况,部分层位产水量高达10 m^3/d以上,给后续勘探开发带来很大困难。利用电阻率、声波及相关系数建立了多套流体性质识别图版,能对产水层进行定性识别。在定性判别流体性质的基础上,结合电阻率、声波、相关系数等参数构建产水指数,进而建立产水指数与气井产水量之间的关系。结果表明,产水指数越大,产水风险越高。该方法具有一定实用价值,对本区致密砂岩气的勘探开发具有重要意义。

Some gas wells in block L of Ordos basin began to produce water in varying degrees, and the water yield of some strata is as high as more than 10 m^3/d, which brings great difficulties to subsequent exploration and development. By using resistivity method, acoustic method and correlation coefficient method, several sets of fluid property identification plates were established, which can identify the water-producing layers qualitatively. On the basis of qualitative identification of fluid properties, water production index is constructed by combining resistivity, acoustic wave, correlation coefficient and other parameters, and then the relationship between water yield index and water yield of gas wells was established. The results show that the higher the water yield index is, the higher the risk of water yield is. The method has certain practical value and is of great significance to the exploration and development of tight sandstone gas in this area.