利用储层分类进行水淹层测井解释的方法研究

On Log Interpretation of Water Flooded Layer with Reservoir Classification Method

L油田是大庆长垣外围开发较早的主力油田,目前已进入高含水期。针对研究区储层类型多样、非均质性强的特点,应用概率图法将S油层划分为3类,开展了水淹机理分析研究,获得了岩心电阻率、电阻率增大率和含水饱和度的变化规律。结合研究区储层含泥含钙的特点,应用有效介质对称导电理论,建立了含钙泥质砂岩有效介质电阻率模型,取得了较好的解释应用效果。经密闭取心资料检验,水淹层测井解释符合率达到80%以上,能够满足水淹层解释和剩余油评价的需要。

L oilfield at the outer-ring of Daqing placantieline is in the stage of high water cut with many years development as a major reservoir for Daqing oilfield. Reservoir in this area has the characteristics of complicated pore spaces and strong heterogeneity. Oil layer S is classified into 3 categories based on probability graph. Researches on water-flooded mechanism are carried out. Obtained are the regularity for change of core resistivity, resistivity index and water saturation. Because the researched formation contains mud and calcareous material, the effective medium re- sistivity models in calcareous argillaceous sandstone is build from effective medium symmetrical conduction theory. Sealing core drilling data shows that coincidence rate of water flooded layer log interpretation is above 80%. This method can meet demand of water flooded layer log interpretation and remaining oil evaluation.