塔河油田奥陶系碳酸盐岩溶洞型储集体识别及定量表征

Ordovician carbonate fracture-cavity reservoirs identification and quantitative characterization in Tahe Oilfield

采用井震联合、动静结合手段,识别出塔河奥陶系碳酸盐岩溶洞型储集体21个缝洞单元,并根据缝洞单元储量规模和天然能量进行分类评价;整合井震资料,采用协同序贯指示模拟方法,建立塔河油田溶洞储集体的三维展布模型。结果表明:溶洞型储集体是塔河油田最主要的储集类型,钻录井过程中出现严重井漏、放空和钻时降至极低是识别大型溶洞的重要标志;'串珠状反射+波阻抗高异常'为溶洞型储集体的典型地震响应特征,据此可以定性预测井间溶洞展布;融合反射能量体和高精度相干体能定量预测井间溶洞展布。

In Tahe Ordovician carbonate fracture-cavity reservoirs,21 fracture-cavity units were divided by integrating well-seismic data with static and dynamic methods.According to natural energy and the reserves scale,the fracture-cavity units were classified and evaluated.A 3D through-going model of cave reservoirs in Tahe Oilfield was built by integrating well-seismic data and sequential indicator co-simulation.The results show that the cave reservoir is the main reservoir in Tahe Oilfield.During drilling and logging,serious fluid loss,drilling tools unloading and drilling time reducing to the minimum are important indicators to a large cave.The beads-shaped reflection and high abnormal impedance are the typical seismic response characteristic of cave reservoirs.Based on this,the spread of caves between wells can be predicted qualitatively.Besides,the reflection energy bodies and high-accuracy coherence cube can quantitatively predict caves distribution between wells.