钙质夹层对水淹层解释影响的分析研究

Influence of the Calcareous Interlayer on Interpretation of Water-Flooded Zone

钙质夹层是陆相储层的重要夹层之一,它增强了储层非均质性阻碍了流体流动,加大了油气开发难度,但又由于夹层的隔挡使得在油田开发后期仍有大量剩余油分布,当地层水淹后,由于钙质夹层的存在,会使该地区水淹情况变得极其复杂,造成了水淹层解释的难度。永乐油田储层中含有较多的钙质夹层和薄夹层,对测井曲线的影响较大,造成了储层关键测井曲线的失真,水淹后测井解释极其困难。针对油田储层特点,总结了钙质夹层对储层的影响原因,理论上分析了永乐地区钙质夹层的测井曲线特征,定量上分析了其对水淹层解释的影响,形成了一套行之有效的处理办法。经油田实际应用效果明显。

Calcareous interlayer is one of the important interlayers of land facies reservoir. It enhances heterogeneity of reservoir and impedes fluid flowing which brings great difficulty to oil and gas development. But there is still lots of remaining oil in the late period of oilfield development because of blocking of interlayers. When formation is flooded, waterflooding conditions in the area can be very complex owing to calcareous interlayer and result in hard interpretation of water-flooded zone.There are many calcareous interlayers and thin interlayers in Yongle oilfield, which has great influence on logs and cause them distorted. Well logging interpretation is very difficult.According to the characteristics of the reservoirs, the influence of calcareous interlayer on reservoirs is summarized in the paper. An effective processing method is formed.It is proved effective through practical application.