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声波时差是常规测井获得地层孔隙度的重要手段之一,但在水平井条件下易受井眼环境以及地层模型变化影响,原有的解释模型在此不再适用。本文针对水平井中岩石的声波各向异性特征,通过实验的方法研究了在水平井与在垂直井中测量的声波时差的关系,以对水平井条件的声波时差进行各向异性校正。对于快速夹层影响水平井中的声波时差响应,通过数值模拟的方法研究了临界值图版,研究表明在水平井解释中要参考井眼轨迹与地层界面之间的关系。在所列举的事例中证明了以上方法可使地层孔隙度以及解释更加精确可靠。
The acoustic jet lag is one of the most important means of obtaining formation porosity in conventional logging. However, under the condition of horizontal well, it is easily affected by the wellbore environment and the change of formation model. The original interpretation model is no longer applicable here. In this paper, according to the acoustic anisotropy characteristics of rock in horizontal wells, the relationship between horizontal well and acoustic time difference measured in vertical wells is studied by experimental method to correct anisotropy of horizontal well time. For the rapid mezzanine that affects the acoustic jet response in horizontal wells, the critical plate is studied by numerical simulation. The results show that the correlation between well trajectory and formation interface should be consulted in horizontal well interpretation. In the listed examples, it is proved that the above methods can make the formation porosity and interpretation more accurate and reliable.