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Weatherford公司开发了一种随钻方位伽马测井仪——LWD SpectralWave Gamma-ray Tool,用于非常规储层开发,该仪器提供了实时记录的伽马谱测量数据和用于高质量成像的方位数据。传感器采用较大的闪烁探测器,包含1.5 in×8 in增益稳定的碘化钠晶体,安装在钻铤外面,大大降低了钻铤材料对自然辐射的衰减影响,同时也提供更宽范围的测量值。除了测量总伽马值,还可采集伽马谱数据,实现了地层钾、铀和钍测量。钾和钍为页岩储层黏土含量测量提供了有价值的信息,特别存在于钙质和粉砂质地层中。利用黏土含量可估测出储层不同部分的脆度。常规自然伽马测井不能准确识别出富含铀的层段,要准确评价页岩的有机碳含量十分困难。当仪器滑动钻进时,组合使用
Weatherford has developed a LWD SpectralWave Gamma-ray Tool for unconventional reservoir development that provides real-time recorded gamma spectrometry data and high-quality imaging Orientation data. The larger scintillation detector with 1.5 in. X 8 in. Gain-stabilized sodium iodide crystals mounted outside of the drill collar greatly reduces the effects of collar material on natural radiation attenuation while also providing a wider range of measurements value. In addition to measuring the total gamma value, gamma-ray data can also be acquired for formation of potassium, uranium and thorium measurements. Potassium and thorium provide valuable information for measuring clay content in shale reservoirs, especially in calcareous and silty formations. The clay content can be used to estimate the brittleness of different parts of the reservoir. Conventional gamma ray logging can not accurately identify uranium-rich intervals, and it is very difficult to accurately evaluate the organic carbon content of shale. When the instrument sliding drilling, combined use