物质平衡方法在气藏开发中的应用

物质平衡方法在气藏开发中占有重要位置。对于水驱气藏来说,水侵主要维持地层压力,直到水突破之后,将会直接影响到气藏的采收率。因此如何在早期识别气藏的类型,从而进行开发的部署显得相当重要;另外气藏地质储量、采收率的确定已经动态指标的预测也贯穿了整个开发历程。目前不少学者对于气藏物质平衡进行了大量的基础性研究工作,为了更深入的了解物质平衡方法在实际气藏开发中有哪些应用,从水驱气藏的早期识别、水驱气藏水侵量的计算、地质储量的确定、采收率的确定、动态指标的预测等五个方面进行详细综述。针对水侵气藏早期识别时,综合对比了视地层压力法、采出程度法和视地质储量法,并给出不同方法的优缺点和使用范围。对于地质储量的确定,以异常压力气藏为例,说明了单单利用p/Z-Gp外推法得到的储量是不准确的,从物质平衡角度出发,给出了新的计算异常压力气藏地质储量的方法,并用实例进行了验证。

The application of the material balance method ingas reservoir development

Material balance method plays an important role in the gas reservoir development. For water drive gas reservoir, water invasion is mainly to maintain formation pressure, which will directly affect the gas reservoir recovery efficiency until water breakthrough. Thus the identification of gas reservoir types In early time is important. And also, the determination of the gas reservoir geological reserves, recovery factor and dynamic index forecast is throughout the entire development process. At present, many scholars have done a lot of basic research work for gas reservoir material balance. In order to understanding the application of material balance method in the actual gas reservoir development, A detailed review have conducted from five aspects: the recognition of the gas reservoir type, the calculation of water influx, the determination of geological reserves, the determination of recovery factor, the prediction of dynamic indicators. For the recognition of the type of gas reservoir in early time, compared the apparent formation pressure method, recovery degree method and apparent geologic reserves method and then given the advantages and disadvantages for different methods. For the determination of geological reserves, take the abnormal pressure gas reservoir as an example, shows that only use extrapolation method to determine the of reserves is inaccurate, from the perspective of material balance, gives a new calculation method for abnormal pressure gas reservoir geological reserves. At last an example is verified.