C-14加速器质谱技术在油田井间示踪中应用的方法研究

The petroleum industry is the backbone of Chinese economy, and occupies an irreplaceable strategic position in the national economy. At present, the majority of our oil fields were in the processes of the secondary or tertiary oil recovery，and suffer from the high permeability layer and the large pore phenomenons. The full understanding of the underground distribution and utilization of injected fluid,the heterogeneity of reservoir and the remaining oil distribution is the urgent problem to be solved. However, due to their limited sensitivity and the high-level radioactivity, the traditional tracers for the oilfield inter-well monitoring do not work very well.In order to overcome the difficulties of limited tracer species, low sensitivity and the higher radioactivity,and scientifically guide the mining in the mid-late development stage, a technique of 14C isotope tracer combined with highly sensitive accelerator mass spectrometry will be developed and applied in the study on the oilfeild inter-well monitoring. In this project, the tracer response in production well will be tracked, then the advance speed, spread volume and the recovery rate of injection fluid will be abtained. Finally, the reservoir heterogeneity characteristics, such as the thickness, porosity, permeability and residual oil saturation,will be fitted according to the fluid mechanics theory. The 14C-AMS technique developed in this work is expected to be a standard analytical methods for evaluation of the remaining underground reservoir characteristics ,and provide important scientific guidance and theoretical basis for the mid-late oilfield recovery process.

石油工业是我国重要的工业基础，对于国家经济和安全具有不可取代的战略地位。目前，我国多数油田已经开始进入二次、三次采油阶段，陆续进入高含水、特高含水开发后期，大部分油田区块已普遍存在特高渗透层、大孔道现象，严重威胁着油田产业的稳产开发。因此，了解目前油藏中非均质状况以及注入流体的地下分布和利用率,继而采取治理措施改善油田采收率, 成为当前迫切需要解决的问题。然而，由于灵敏度和放射性因素，传统示踪剂对油田井间示踪效果受到一定限制。为了克服传统方法示踪剂单一、灵敏度低以及放射性高等困难，更有效地指导我国油田中后期科学开采，本项目拟采用高灵敏度14C-AMS同位素示踪技术，跟踪监测示踪剂在采油井上的响应，拟合井间地层的厚度、孔隙度、渗透率、剩余油饱和度等油藏非均质特征，建立14C示踪评价地下剩余油藏特征的标准分析方法，为我国油田的中后期开采过程的调剖堵水提供科学指导方案和理论依据。

石油工业是我国重要的工业基础，对于国家经济和安全具有不可取代的战略地位。目前，我国多数油田已经开始进入二次、三次采油阶段，陆续进入高含水、特高含水开发后期，大部分油田区块已普遍存在特高渗透层、大孔道现象，严重威胁着油田产业的稳产开发。因此，了解目前油藏中非均质状况以及注入流体的地下分布和利用率,继而采取治理措施改善油田采收率, 成为当前迫切需要解决的问题。然而，由于灵敏度和放射性因素，传统示踪剂对油田井间示踪效果受到一定限制。为了克服传统方法示踪剂单一、灵敏度低以及放射性高等困难，更有效地指导我国油田中后期科学开采，本项目采用了高灵敏度14C-AMS同位素示踪技术，跟踪监测示踪剂在采油井上的响应，拟合井间地层的稀释系数、孔隙度、渗透率、平均孔喉半径等油藏非均质特征，建立了14C示踪评价地下剩余油藏特征的标准分析方法，为我国油田的中后期开采过程的调剖堵水提供科学指导方案和理论依据。