关键词: 方向伽马, 随钻测井, 钻遇率

Abstract: In the heterogeneously distributed area of thin oil and gas pay zones with a varying dip angle, use of gamma LWD instrument for measurements is unable to accurately judge the upper and lower positions of the target layer when the drilling bit reaches the interface between two layers, easily leading to wrong decisions and affecting effective drilling rate of the target layer. The measurement functions of azimuth gamma LWD instrument can be performed through offset installation of gamma probe, quick identification of sector barrier and sector position, and data processing technology and method. This azimuth gamma LWD instrument can make real-time measurement in the logging-while-drilling process and separately display the gamma values of the upper and lower sides of the borehole as well as the average natural gamma value of the peripheral rock off the borehole. When used on the site, it can accurately determine changes in the level series and timely and precisely help the on-the-site geologists and directional engineers with their service work, effectively improving the drilling rate of reservoirs.