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介电常数不相关(DCI)技术处理随钻电磁波测井资料时不需要对介电常数作出假设,而由相移和衰减求取电阻率和介电常数。与假定介电常数技术的区别是该技术把介电常数当作地层的一个独立性质来处理。介电常数与地层岩石和孔隙中流体的作用方式有别于电阻率。由DCI技术得到的电阻率和介电常数会对储层性质,尤其是储层流体类型的判别起到独特的作用。利用电阻率和介电常数交会图,研究了测量值与计算值之间的关系。对不同频率,由归一化的相移和衰减等值线构建交会图。根据该图可以确定最适于DCI技术的电阻率和介电常数的区域。应用DCI/交会图方法处理了大量的随钻电磁波测井资料,包括含气和水的泥岩、含气和水的砂岩以及含油和水的碳酸盐岩地层。结果发现,这些储层在交会图上的位置不同。产生这种差异的一种原因是介电常数和电阻率对地层流体类型及其分布的响应与电阻率不同。给出了DCI/交会图方法的应用实例。在气砂层,可以得到介电常数和含水饱和度的关系。研究表明,在电阻率差异很小的淡水层和含烃储层,该技术具有良好的应用前景。
Dielectric constant irrelevant (DCI) techniques do not require the assumption of permittivity when processing electromagnetic waves from the borehole while resistivity and permittivity are determined from phase shifts and decay. The difference from the assumed dielectric constant technique is that the technique treats the dielectric constant as an independent property of the formation. The dielectric constant is different from the resistivity of fluids in formation rocks and pores. Resistivity and permittivity derived from DCI technology can play a unique role in determining reservoir properties, especially reservoir fluid types. Using the cross-plot of resistivity and dielectric constant, the relationship between measured and calculated values was studied. For different frequencies, the cross-plot is constructed from the normalized phase shift and attenuation contour. From this figure, you can determine the area that is most suitable for the resistivity and dielectric constant of the DCI technique. A large number of logs of electromagnetic waves while drilling are processed using the DCI / cross plot method, including gas and water mudstone, gas and water sandstone, and oil and water carbonate rock formations. The results show that the location of these reservoirs on the cross-plot is different. One reason for this difference is that the permittivity and the resistivity have different responses and resistivities to the formation fluid type and its distribution. The application example of DCI / cross plot method is given. In the sand layer, you can get the relationship between dielectric constant and water saturation. The research shows that this technology has good application prospects in freshwater reservoirs and hydrocarbon reservoirs with little difference in resistivity.