应用碳氧比能谱测井资料评价储层大孔道

Big Porous Reservoir Evaluation Using C/O Spectra Log Data

大庆喇萨杏油田长期注水开发导致油层的孔隙结构发生很大变化,形成低效或无效注水循环层,即大孔道。从碳氧比能谱测井原理出发,分析了硅钙比值(Si/Ca)与泥质含量、氢硅比值(H/Si)与孔隙度等的关系。提出了一套利用碳氧比能谱测井资料计算泥质含量、孔隙度和目前含水饱和度的测井解释方法,并结合完井测井资料有效识别、评价储层大孔道。该方法在实际生产中应用,取得了较好的地质效果。

Long-term waterflooding exploitation in Daqing Lasaxing oilfield caused changes in reservoir porosity structure, and formed inefficient water circulating formation, that is, the big porous reservoir. Analyzed are the relationship between the Silicon Calcium ratio （Si/Ca） and the shale volume （Vsh）, the hydrogen Silicon ratio and porosity according to carbon oxygen ratio （C/ O） spectra logging principle. Put forward is a log interpretation method to calculate Vsh,porosity and current water saturation with C/O log data. This method can identify and evaluate the big porous reservoir efficiently combining with the open hole log data. The method obtained good geology result in actual log applications.