不同直径双晶C/O仪器的响应特征比较

研究不同直径C/O测井仪器的测井响应，可以发现它们之间的优势和缺点，为仪器的研制提供参考。采用Monte Carlo方法，在孔隙度为20%的砂岩地层中，对直径为89 mm、54 mm和43 mm三种C/O仪器的测井响应进行了计算，得到了各直径仪器C/O值随源距的变化关系。经过数据处理和分析认为：大直径仪器受井眼影响最小，短源距不能对长源距起到有效的补偿作用；中等直径仪器区分地层能力最强；小直径仪器受井眼的影响最严重，其短源距能有效地对长源距起补偿作用。

COMPARING RESPONSE FEATURES OF TWIN-CRYSTAL CARBON-OXYGEN LOGGING EQUIPMENTS WITH DIFFERENT DIAMETERS

Studying the response features of the Carbon oxygen log tools with different diameters can help to find their advantages and defect so as to provide some references for developing logging equipments. By Monte Carlo method, the becoming relationship between the Carbon oxygen value of logging tools with various diameters and the source distances are obtained through respectively calculating the responses of 3 Carbon oxygen log tools with diameters of 89 mm, 54 mm and 43 mm in the sandstone formation with 20％ porosity. By processing data and analyzing the calculation results, it is recognized that the tool with big diameter has smallest influence and the short source distance can’t perform effective compensation function to long source distance; the one with middle diameter has strongest ability of distinguishing formation; the one with small diameter is seriously influenced by borehole and its short source distance can perform effective compensation function to long source distance.