裂缝性致密砂岩气藏剩余气分布预测及开发优化建议:以川西坳陷新场地区须家河组二段为例  

Prediction of Residual Gas Distribution and Suggestion of Development Optimization for Fracture-developed Tight Sandstone Gas Reservoir:A Case Study of the 2nd Member of Xujiahe Formation in Xinchang Area,Western Sichuan Depression

作　　者：吴双 商晓飞 李蒙 赵华伟 廉培庆[1] 段太忠[1] WU Shuang;SHANG Xiao-fei;LI Meng;ZHAO Hua-wei;LIAN Pei-qing;DUAN Tai-zhong(Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China)

机构地区：[1]中国石化石油勘探开发研究院,北京100083

出　　处：《科学技术与工程》2023年第29期12484-12493,共10页Science Technology and Engineering

基　　金：中石化科技部项目(P18089-3)。

摘　　要：裂缝性致密砂岩气藏具有储层基质致密低渗、裂缝非均质发育、气水界面不统一等特点,导致天然气资源动用程度低,气井产能差异大,开发形势整体不乐观。为明确气藏的剩余气分布规律及动用对策,以新场地区须家河组二段气藏为例,根据产能主控因素分析,形成了一套适用于裂缝性致密砂岩气藏的数值模拟技术流程,定量表征了剩余气分布特征,提出了开发优化建议。结果表明:综合考虑构造裂缝和基质砂体岩性对产能的控制作用,对动态模型采用“分井区、分砂组、分介质、分岩性”的方式精细划分流动单元,保证了数值模拟的高效和精度。剩余气分布整体在构造起伏约束下,受基质岩性、断裂裂缝和井控程度影响。建议布井潜力区应具备构造高部位、基质砂体连续、断裂裂缝发育、剩余气富集等条件,进一步根据井间干扰程度和地层能量利用率优化布井位置。The fracture developed tight sandstone gas reservoir is characterized by low permeable matrix,heterogeneous fracture development and inconsistent gas-water contact,which lead to the low producing degree of natural gas resource,large difference between gas well productivity and poor development situation.In order to find out the distribution law and producing strategy of residual gas,the 2nd member of Xujiahe Formation gas reservoir in Xinchang area was taken as an example,a set of numerical simulation process applicable for the fracture developed tight sandstone gas reservoir was established according to the main productivity controlling factors.Then the residual gas distribution was quantitatively characterized and the development optimization suggestion was put forward.The results show that comprehensively considering the controlling effects of tectonic fractures and matrix sand lithology on productivity,the efficiency and accuracy of numerical simulation can be guaranteed through precise division of flow units(well block division,sand group division,medium division and lithology division).Generally,under the constraints of tectonic fluctuation,the residual gas distribution is affected by the matrix lithology,fault-fractures and well controlling degree.It is suggested that the area with high structural position,continuous matrix sand,developed fractures and residual gas enrichment has well deployment potential.According to the well disturbance degree and formation energy utilization,the well deployment position can be further optimized.

关 键 词：致密砂岩储层 裂缝 剩余气 布井 须家河组 新场地区 

分 类 号：TE319[石油与天然气工程—油气田开发工程]