However, Domestic technology lag behind foreign technology in some areas, such as volume control with plastic, sand thickness uniformity control.
但在一些关键技术上，如含胶量控制，夹砂层厚度均匀性控制，与国外同类产品还存在一定的差距。
The impedance data volume was used to predict the sand thickness and the effective sand thickness, showing a good accordance with the drilling results.
利用波阻抗数据体进行了砂岩厚度和有效砂岩厚度预测，预测结果与钻井结果吻合较好。
The influences of threshold pressure gradient, vertical heterogeneity, subzone thickness and areal sand thickness distribution on development of low-permeability heterogeneous reservoirs are analyzed.
根据低渗透非均质油藏的特点，分析了启动压力梯度、纵向非均质性、小层厚度和平面砂体厚度展布对该类油藏开发的影响。
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