论文部分内容阅读
探讨了保压取心岩心分析与核磁共振实验等常规实验方法在测定油水同层型致密油原始含油饱和度中的缺陷,对比了岩心含油饱和度与原始含油饱和度差异,明确了实验求取原始含油饱和度的关键为岩心离开地下原始状态后流体压力释放引起的挥发以及温度变化引起的散失。通过设计挥发性物理模拟实验与密度系数校正,以松辽盆地南部白垩系泉四段致密油密闭取心井位X井储层样品为实例,恢复了原始含油饱和度。实验结果显示,研究区最终原始含油饱和度平均值为43.1%,主要分布在40%~50%之间,相比密闭取心样品抽提含油饱和度平均值23.3%以及分布在10%~30%之间提高了20%。
In this paper, we discuss the defects in the determination of the original oil saturation of the same type oil and water with the conventional experimental methods such as core-holding analysis and NMR experiment, and compare the difference between the oil saturation and the original oil saturation. The key to the original oil saturation is the volatility caused by the release of fluid pressure after the core leaves the original underground condition and the dissipation due to temperature changes. Through the design of volatile physical simulation experiments and density coefficient correction, the original oil saturation was restored by taking the X-well reservoir samples of tight oil wells in the Quaternary Segment of Cretaceous in the southern Songliao Basin as an example. The experimental results show that the average final oil saturation of the study area is 43.1%, mainly distributed between 40% and 50%, compared with the average oil saturation of 23.3% and the distribution of 10% to 30% % Increase between 20%.