偶极子声波测井仪发射声系性能快速检测方法*

该文提出了一种针对偶极子声波测井仪发射声系性能进行快速检测的方法。通过实验测量方法,采用专门设计的简易装置测量偶极子声波测井仪发射声系激发的声场波形,并提取声场强度、声源主频以及空间分布对称性等特征参数。如果准确掌握了仪器处于完好状态时的这些特征参数,以此为参考依据与实验测量结果进行对比,通过设定可接受的相对偏差,就可完成对偶极子声波测井仪发射声系性能的快速评价。相对于现有的声波测井仪器检测方法,该方法具有高效、便捷的优势,便于在测井前线基地应用。     

A new Apparatus for Long-term Petrophysical Investigations on Geothermal Reservoir Rocks at Simulated In-situ Conditions

We present a new apparatus capable of maintaining in-situ conditions pertinent to deep geothermal reservoirs over periods of months while in the same time allowing a variety of continuous petrophysical investigations. Two identical devices have been set up at the GFZ-Potsdam. Lithostatic overburden- and hydrostatic pore pressures of up to 100 and 50 MPa, respectively can be simulated. In addition in-situ temperature requirements of up to 200°C can be met. The use of corrosion resistant parts throughout the pore pressure system allows investigations with highly saline formation fluids. Rock permeability, electrical conductivity as well as compressional- and shear-wave velocities can be measured simultaneously and the pore fluid can be sampled under pressure for further chemical analysis. Scientifically, the usage of the device focuses on risk potentials in exploration and exploitation of deep geothermal reservoirs. Particularly, the investigations address possible effects of fluid-rock interactions on the transport properties of a reservoir host rock.     

基于邻井反射的偶极横波远探测验证方法

偶极横波远探测技术已成为探测井外地质构造的一种重要测井技术,需要针对偶极横波远探测的验证迫在眉睫。本文利用三维有限差分数值模拟方法,对比和分析了地层界面和相邻充液邻井产生的反射横波幅值的差别,结合现场实例,提出了偶极横波远探测成像测井的验证方法。在此基础之上,进一步分析了不同反射邻井结构时,反射横波幅度的变化情况,结果表明,采用多井联合方式可以有效的增加反射波的幅值,减小非共面产生的散射效应影响。最后,初步建立了两口试验井,测试数据处理结果与理论分析结果吻合,为下一步实验井方案的优选和完善提供了理论和数据支持。