WaveSonic测井在致密碳酸盐岩储层评价中的应用

详细介绍了哈里伯顿公司WaveSonic交叉偶极声波测井仪器的特点及其对致密碳酸盐岩储层含气性的识别和对致密碳酸盐岩储层的裂缝评价。实例证明,利用WaveSonic测井的纵横波速度比减小特征与气测烃显示相结合是识别气层很有效的技术手段,且WaveSonic测井的偶极横波各向异性、斯通利波能量衰减与电成像测井结合能定性评价致密碳酸盐岩储层裂缝的有效性。

WaveSoniC测井资料的工程应用

基于先进的测井解释技术，对某区块WaveSonic测井资料的应用研究表明，该项测井技术在更深层次的地层破裂压力及裂缝高度预测的工程应用中具有直观、准确、有效的优点。预测的结果为该区压裂施工作业提供了有价值的参考，从而避免了水窜，提高了开发者实施开发方案的信心，WaveSonic测井资料在该区取得了较好的应用效果。

The fluctuation of acoustic field due to internal waveson the thermocline in typical shallow water

In this paper, the results of experiments concerning the fluctuations of internal waves on the thermocline and the fluctuations of acoustic amplitudes at different ranges in typical shallow water are presented. Recorded time is 48.96 h. Thickness of the thermocline is about 2 m-4 m. The deviation of temperature recorded at a fixed depth is 10℃-15℃. The vertical displacement of isotherm curves is about 5 m-6 m, which is mainly dominated by the lowest model. The measured spectrums of vertical displacement have obvious spectral packet within the range of 0.05 cpm (20 min) and 0. 143 cpm (7 min) besides the diurnal and semidiurnal tide frequency bands. Spectrum attenuation coefficients are between -1.5 and -1.7. Numerical calculation shows that phase velocity and group velocity of internal waves are equal to 0.329 m/s at lower frequencies. And with the increasing of frequency, the group velocity differs from phase velocity at about 0.03 cpm (33.33 min) and drops more quickly. The measured fluctuation of acoustic amplitude is about 8 dB-10 dB. With the increasing of range, the fluctuation trends to be faster and acoustic signals are declining. Spectrum attenuation coefficients are between -1.45 and -2.0. At last, PE method is used to simulate the acoustic amplitude fluctuation, in which internal waves are the important element.

偶极横波测井原理与应用

由于测井资料具有识别性强、连续性好、经济性高等特点,测井曲线成为求取连续地层岩性剖面和岩石力学参数剖面的最佳方法。但随着钻遇地层的日趋复杂,利用常规测井已无法准确、快速识别软地层矿物成分及岩性等信息。而偶极横波测井则能很好地解决以上问题。在充分调研了国内外相关文献的基础上对XMAC、DSI、WaveSonic测井仪原理进行了总结。分析了偶极横波测井发射与接收信号特征的关联关系,提出了如何求取快、慢横波波形信息及其方位的方法。充分利用偶极横波测井资料,可以使计算所得的岩石力学特性、地应力和地层三压力等更加精确。

偶极阵列声波测井在页岩气储层评价中的应用

为了能够有效评价包括页岩在内的特低孔渗储层,新一代的交叉偶极阵列声波测井被广泛关注。WaveSonic、XMAC-II偶极阵列声波测井仪探测深度大、适应范围广、服务成本低,在页岩气储层岩性、裂缝性、含气性和储层可改造性评价方面得到了较好的推广应用。实例证明,利用偶极阵列声波测井声波时差、横纵波时差比、偶极横波各向异性及斯通利波能量衰减特征,能有效评价页岩气储层。

偶极声波仪在青海油田应用中出现的问题分析

传统的单极声波测井仪只能测量地层的纵波波速,且有其自身的缺点。对于硬地层来说,可以通过对长源距声波全波测井资料的分析、处理,获得纵、横波波速,但在软地层中无法获得横波速度。通过偶极声波测量技术可以测量地层的横波,进而计算岩层弹性及非弹性参数、地应力参数、孔隙度、渗透率等,使声波测井曲线提供的有用信息量骤增。文章从电路入手,分析了在青海油田偶极声波仪在应用中出现的问题,总结了解决方法。