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近年来我国能源供应日益紧张,积极开发国内储量丰富的页岩气资源是有效解决该问题的主要途径.水平井以其可增大泄油面积、提高单井产量成为开发页岩气的主要开发技术之一,由于页岩气储层具有隐蔽性、致密性、脆性和非均质各向异性等特点,加上我国页岩气藏埋藏深、有机碳含量较低,常规的钻井技术很难实现页岩气层较高的钻遇率,严重影响了压裂增产效果,地质导向是解决该问题的关键技术.鉴于国内页岩气井的地质导向主要使用一条随钻自然伽马而未测到密度、中子和电阻率等曲线,难以保持钻头在优质储层中钻进.为此,介绍了一种基于支持向量机的随钻测井曲线实时预测新方法,方法基于非线性回归支持向量机的基本原理,优选邻井的录井、校正后的测井等资料作为输入特征和输出特征,建立页岩气地质导向的随钻测井曲线预测模型,后使用本井的录井资料和实测测井资料进行预测和校正.实例分析表明,方法的预测结果准确度高、稳定性强,可有效指导钻头钻进,提高优质储层的钻遇率.
In recent years, China’s energy supply has become more and more tense, and actively developing domestic reserves of shale gas resources is the main way to effectively solve this problem.While the horizontal wells with its can increase the drainage area, increase single-well production become the main development shale gas development As one of the technologies, shale gas reservoirs are characterized by covertness, compactness, brittleness and heterogeneity anisotropy. In addition, because shale gas reservoirs are buried deeply and organic carbon content is low in China, conventional drilling technology is difficult The high drilling rate of shale gas is affected and the stimulation effect of fracturing is seriously affected, and the geosteering is the key technology to solve the problem.Because the geosteering of domestic shale gas wells mainly uses a natural gamma ray while drilling, Density, neutron and resistivity curves, it is difficult to keep the bit drilling in the high-quality reservoir.Therefore, a new method of real-time logging while drilling curve prediction based on support vector machine is introduced. The method is based on the nonlinear regression support vector Machine basic principles, such as the next well log, corrected logging data as input features and output characteristics, the establishment of shale gas-oriented logging-while-drilling curve prediction model, the use of this well Logging data and measured log data to predict and correct. Case study shows that prediction method of high accuracy, stability, and can effectively guide the drill bit drilling, drilled to improve the quality of the reservoir.