偶极横波远探测技术在隐蔽储层识别中的应用

The Application of Dipole Shear Wave Remote Detection Technique in Hidden Reservoir Identification

岩溶型碳酸盐岩储层发育和分布具有极强的非均质性,现有测井方法受径向探测范围限制很难发现远离井眼的缝洞储集体。利用偶极横波四分量测井资料,采取波形转换、压振、波幅补偿、波场分离和偏移成像等处理技术,对井周3~50m范围内的地质反射界面进行成像,得到地质反射界面的距离和走向。利用数值模拟,研究了裂缝、孔洞及洞穴等地质界面的成像特征,分析了偶极横波远探测技术方法的适用性,建立了反射体的解释模型。实例分析表明,该技术及解释模型能有效识别远井眼隐蔽储集体,解释结果与酸压结论一致,为隐蔽储层识别和酸压改造提供了依据,提高了勘探成功率。

The development and distribution of karst carbonate reservoirs were highly heterogeneous,and it was difficult to find the fracture-cavity reservoirs away from the wellbore by conventional logging series which was constrained by radial depth of detection.Based on the four-component logging data of dipole shear wave,the geometrical reflection interface in the range of 3～50 m was imaged to obtain the distance and direction of the reflection interface by using waveform processing,vibration suppression,amplitude compensation,wave field separation and offset imaging.Combined with numerical simulation,the formation characteristics of fracture,crevice zone,cave were studied,and the interpretation model of reflector was established.Analysis of examples shows that the technique and the interpretation model can effectively identify the reservoirs in remote wellbore,and the interpretation results are consistent with that of acid fracturing.It provides the basis for the identification of hidden reservoirs and the of acid fracturing,and improving the success rate of exploration.