川北通南巴地区须家河组储层孔隙度下限研究

Research on the Porosity Cutoff in the Xujiahe Formation in Tongnanba Area of Northern Sichuan Basin

摘要: 四川盆地北部通南巴地区须家河组致密碎屑岩储层孔隙度下限原为3.5%，随着勘探开发的持续深入和水力压裂等工艺技术的进步，原孔隙度下限略显滞后于当前勘探开发水平，一定程度上制约了气田增储上产工作。基于岩心分析、测井、地质、测试等多种资料，采用采用经验统计法、孔渗关系法、分布函数交会法、试气法、类比法(邻区经验借鉴)等方法，开展了通南巴地区须家河组储层物性下限的重新确定工作，通过上述多种方法综合确定了通南巴地区须家河组致密砂岩类储层孔隙度下限为3.0%，须家河组储层孔隙度下限的重新探讨和厘定对于后续气藏储量评估和提交以及开发生产具有重要意义。

Abstract: The porosity cutoff in the tight clastic reservoir of the Xujiahe Formation in the Tongnanba area of the northern Sichuan Basin was originally 3.5%. With the continuous deepening of exploration and development and the advancement of hydraulic fracturing and other technology, to some extent, the porosity cutoff is slightly lagging behind the current level of gasfield exploration and development, which restricts the work of increasing gas field storage and production. Based on various data such as core analysis, logging, geology, and testing, and using methods such as empirical statistics, pore permeability relationship, distribution function intersection, gas testing, and analogy (referring to neighboring area experience), the cutoff of reservoir physical properties in the Xujiahe Formation in the Tongnanba area was redefined. Through the above methods, the porosity cutoff in the tight sandstone reservoir of the Xujiahe Formation in the Tongnanba area was comprehensively determined to be 3.0%, The re-determination of the porosity cutoff in the Xujiahe Formation reservoir is of great significance for subsequent gas reservoir reserve evaluation, submission, and development and production.