延113—延133井区山23致密砂岩无阻流量预测

Absolute open flow prediction of Shan23 tight sandstone in Yan113Yan133 well block

延113—延133井区位于鄂尔多斯盆地南部,二叠系山23储层发育低孔、低渗、低压致密砂岩气藏,以水力压裂开发为主。为了评价储层改造效果,井区在压裂改造前利用测井和录井数据,运用Kohonen神经网络岩性识别的方法实现了山23储层试气无阻流量预测。研究结果表明,在常规压裂条件下,储层厚度和岩性是控制产能的主要因素,石英砂岩储层压裂试气单米无阻流量为0.8×10^(4)~1.0×10^(4) m^(3)/d,岩屑石英砂岩储层单米无阻流量为0.3×10^(4)~0.5×10^(4) m^(3)/d,岩屑砂岩储层压裂后产能较低,排活困难。该研究成果对井区山23气藏的高效开发具有指导意义。

Yan113Yan133 gas field sits in the southern Ordos Basin.The Permian Shan23 tight sandstone is main producing reservoir with low-porosity,low-permeability and low-pressure,which is mainly developed by hydraulic fracturing.In order to evaluate the effect of reservoir stimulation,the wireline and mud log data were used to predict the absolute open flow of gas test in Shan23 reservoir by using neural network method before fracturing.The result of research shows that under conventional hydraulic fracturing conditions,reservoir thickness and lithology are the main factors controlling productivity.The open flow rate of quartz sandstone reservoir per meter is 0.8×10^(4)~1.0×10^(4) m^(3)/d,the lithic quartz sandstone reservoir per meter is 0.3×10^(4)~0.5×10^(4) m^(3)/d.The productivity of lithic sandstone reservoir is much lower.The research results have guiding significance for efficient development of Shan23 gas reservoir in Yan113Yan133 well block.