摘要
裸眼井声波测井受井眼影响很大,特别是浅层扩径的影响。本文将文献[1]的结果推广到笔者得到的、被实验证实了的井限及纯砂岩孔隙度与井内声场中所能传播的首波频率的关系。从理论上指出了现用的声波测井频率与浅层扩径砂岩的不适用性。并建议在扩径严重的目的层测井时选用高频或低频发射、接收探头。
Open hole acoustie logging is influenced by borehole, especially in hole-expanded sandstone section. A theoretical relationship between transmiblefrequency of first wave arrival and borehole diameter and porosity has beenderived and confirmed experimentally. The author points out that the respon-sive frequency range of transmitters and receivers in acoustic logging tools are not suitable for hole-expanded sandstones. A suggestion that lower or hi-gher responsive frequency range be used is made.
