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随钻测井曲线在地质导向钻井和实时地层评价中有着重要的用途。考虑到实际钻井中常测有一条随钻伽马曲线而未测随钻电阻率和孔隙度曲线这种情况，章介绍了一种实时构造随钻测井曲线并用于水平井钻井的地质导向新方法。该法根据邻井(直眼井或水平井)的测井和录井资料，借助于回归分析法和BP神经网络法，可模拟生成随钻电阻率和孔隙度曲线，利用该模拟曲线可提高地质导向钻井的能力。将该法应用于新疆莫北油田3口水平井的实时钻井中，取得了明显的随钻跟踪地质目标效果。

Research on the Simulation of LWD Curves and Its Geosteering Application

LWD (logging while drilling) curves play an important role in geosteering drilling and real time formation evaluation.In consideration of the situation that in drilling only GR curve was measured while resistivity and porosity curves weren't,a new method of simulating real time LWD curves and applying them to the geosteering drilling of horizontal wells is introduced in the paper.According to such an approach,on the basis of the well logging and geological logging data collected from the adjacent wells (vertical or horizontal),the resistivity and porosity LWD curves may be simulated by means of the regression analysis and BP neural network methods.The geosteering drilling ability may be raised by use of these simulated curves.An obvious effect of tracing while drilling geological targets was achieved through applying this technique to the real time geosteering drilling of three horizontal wells in Mobei oil field in Xinjiang.