十里加汗地区下石盒子组一段致密砂岩气层识别研究

Recognition of Compacted Sandstone Gas Reservoirs in the First Member of Shihezi Formation in Shilijiahan Area

十里加汗地区下石盒子组一段(P1sh1)是典型的低孔、低渗致密砂岩储层。由于储层物性差、非均质性强等因素,使得该区存在气层识别难度大的问题。为了准确识别气层,提出了几种适合研究区的气层识别方法:双孔隙度重叠法、视水层中子孔隙度测井值法、核磁共振法以及偶极声波测井法。通过试气结果分析,证明了气层识别方法的有效性,较好地解决了十里加汗地区下致密砂岩储层气层识别难度大的问题,具有良好的推广应用价值,也为油田的进一步开发提供了一定的技术支持。

The first member of Xiashihezi Formation in Shilijiahan Area was a typical compacted sandstone reservoir with low porosity and low permeability.Due to its poor reservoir property and strong heterogeneity,it was difficult to identify and evaluate the gas reservoir.In order to solve the difficult problem of identifying gas reservoir,methods suitable for gas recognition in the region were proposed.These methods included the dual porosity overlay method and method of apparent neutron porosity value of water layer,nuclear magnetic resonance logging and dipole acoustic logging.Case study analysis result shows that the methods for gas reservoir identification are effective.It is used for successful solving the difficult problem of recognizing gas in compacted sandstone reservoir in Shilijiahan Area.The methods can be popularized,it provides some technical supports for the further development of the oilfield.