特高含水开发期曲流河储层构型深化研究及应用

Deepening research and application of meandering river reservoir configuration at extra-high water cut development period

宁士华 肖斐 束宁凯

中国石化胜利油田分公司地质科学研究院，山东 东营 257015 中国石油大学（华东）地球科学与技术学院，山东 青岛 266580

Geological Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257015, China College of Geoscience and Technology, China University of Petroleum, Qingdao 266580, China

针对孤岛油田Ng3油藏非均质的地质特征，采用油藏综合分析、测井响应分析及数值模拟等方法，开展了特高含水开发期高弯度曲流河储层构型深化研究，解析了单河道、点坝及点坝内部构型单元等不同级次曲流河的储层构型模式，通过采用层次约束、模式拟合的构型表征方法，系统地进行了复合曲流带、单一曲流带、单一点坝及点坝内部侧积体精细表征，建立了密井网区三维构型模型及参数模型。同时针对特高含水期储层构型控制下的剩余油分布特点，开展了井网调整转流场+非均相复合驱先导试验。结果表明：中心井区日产油量由4.5 t上升到71.0 t，含水率由98.8%下降到83.5%，累计增油26 539 t，预计井网调整转流场提高采收率2.3百分点，非均相复合驱提高采收率6.2百分点，试验区采收率达到63.6%。

Aiming at the geological characteristics of reservoir heterogeneity for Ng3 reservoir of Gudao Oilfield, deepening research of high-sinuosity meandering river reservoir configuration at extra-high water cut development period is carried out, and different levels of meandering river reservoir configuration modes for single river channel, point bar and the inner configuration unit of point bar are analyzed through reservoir analyses, log response analyses and numerical simulation method. The fine characterization of composite meandering zone, single point bar and internal lateral accretion body is conducted and the three-dimensional configuration and parameter models in dense well pattern area are established by using configuration characterization method of hierarchy constraint and model matching. At the same time, for the distribution features of remaining oil under the controlling of reservoir configuration at extra-high water cut stage, well pattern adjustment turning flow field and heterogeneous combination flooding pilot test are conducted. Results show that the daily oil production is improved from 4.5 t to 71 t and water cut is decreased from 98.8% to 83.5% in center well area. The cumulative oil increment has reached 26,539 t. Oil recovery of 2.3 percentage points is predicted in well pattern adjustment turning flow field. Enhanced recovery of 6.2 percentage points is predicted for heterogeneous combination flooding and the recovery ratio has attained 63.6% in pilot test area.

10.6056/dkyqt201303020