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礁灰岩储层的双重介质特征决定了油田开发中水平井钻井风险高,有效储层钻遇难度大。为了确保钻井安全,提高储层钻遇率,在南海东部礁灰岩油田水平井开发中,应用GVR成像测井技术,对水平井进行实时地质导向,快速识别地层倾角以及裂缝,根据地层倾角的变化和裂缝发育程度,优化钻井轨迹。流花油田开发实践表明,利用GVR成像测井技术实施的7口水平井均没有发生严重井漏,成功规避了钻井风险,且单井初始日产油量在283.3~1828.4m3,确保了优质储层钻遇率。同时,GVR成像测井的裂缝解释突破了传统单一依靠地震的识别方法 ,为定量描述井旁裂缝空间分布以及裂缝对产能的影响研究提供了基础。研究表明,礁灰岩储层中单井产能与裂缝发育程度有较好的对应关系,单井裂缝发育程度越高其产能也越高,为油田后期调整井的设计和实施提供了地质依据。
The dual media characteristics of reef limestone reservoirs determine the high risk of drilling horizontal wells in oilfield development and the difficulty of effective reservoir drilling. In order to ensure the safety of drilling and improve the rate of reservoir drilling, GVR imaging logging technology was applied to develop horizontal wells in eastern reef limestone fields in the South China Sea. Real-time geological guidance was applied to horizontal wells to quickly identify formation dip and fracture. According to the dip of the strata Changes and fracture development, optimization of drilling trajectory. The practice of Liuhua Oilfield shows that no serious horizontal well leakage occurred in the seven horizontal wells implemented by GVR imaging logging technology, which successfully avoided the risk of drilling and the daily initial production of single well was 283.3 ~ 1828.4m3, which ensured the high-quality reservoir drilling rate. At the same time, the interpretation of fractures in GVR imaging logging broke through the traditional single-dependent earthquake identification method, which provides a basis for quantitatively describing the spatial distribution of fractures near the well and the impact of fractures on production capacity. The results show that single well productivity in reef limestone reservoirs has a good correspondence with the degree of fracture development. The higher the degree of single well fracture development is, the higher the productivity is, which provides a geological basis for the design and implementation of late adjustment wells in oilfields.