黄陵探区致密浊积砂体储层孔喉特征及其渗流试采效果评价

Characteristics of Density Turbidite Sand Body and Pre-production Effect Evaluation in Huangling Exploration Area of Ordos Basin

为了刻画研究区致密浊积砂体储层孔隙、喉道的连通关系及其开发渗流特征,在区域背景研究基础上阐述了储层的宏观特征;并运用铸体薄片、粒度、扫描电镜等分析测试,从微观角度研究了致密浊积砂体储层的孔隙、喉道及其连通关系;最后结合核磁共振、恒速压汞资料、试采资料分析了不同类别储层的渗流及开发特征。研究表明:区内岩石颗粒偏细,分选差成岩作用强是储层致密的基本因素;同时发育不同规模的裂缝。储层整体上以溶蚀孔隙及点状-片状喉道二类储层为主,平均孔喉比中等,流动可动饱和度偏低,渗流能力一般。致密储层在开发初期产量递减大,半年后单井产能一般在0.2 t/d。

In order to depict the reservoir pore of density turbidite sand body,throat connecting relation and the seepage characteristics of exploitation,the macroscopic characteristics of the reservoir on the researching basis of regional background was described,and used some test means such as the casting thin sections,granularity,scanning electron microscope.The reservoir pore of density turbidite sand body and throat connecting relation from the microscopic view were studied.Finally the seepage and development characteristics of different reservoirs combining with nuclear magnetic resonance（NMR）,constant speed mercury injection data and test data so on were analysed.The study showed that the basic factors of dense reservoir are partial thin rock particles,poor sorting,strong diagenesis and fracture in different scale.Reservoirs as a whole mainly are dissolution pores and dot-flake throat,the average pore throat ratio is medium,movable saturation of flowing is lower,the seepage ability is general.the oil production decline is larger at the beginning of the deveiopment,after half a year single well production capacity generally is 0.2t /d.