利用普通源距全波列测井识别天然气

地层中天然气（裂缝）和泥质（泥岩）的存在会使普通源距全波列测井资料有相似的响应特征，这给快速、准确、直观地识别天然气（裂缝）带来了困难。文章针对此现象，从能量的衰减入手，用（能量）比值、（能量）差比值的数学方法将泥质（泥岩）引起的衰减去掉，从而消除由泥质（泥岩）引起的天然气（裂缝）识别假象，获得了真实的天然气（裂缝）测井响应。该方法在实际应用中见到了良好的地质应用效果。

IDENTIFYING NATURAL GAS BY GENERAL SPACING FULL WAVETRAIN LOG

Because the respond characteristics of general spacing full wavetrain logging of natural gas (fractures) are similar to those of shaliness (mudstones) in strata, it was difficult to identify the natural gas (fractures) rapidly, exactly and visually. For this reason, the energy attenuation caused by shaliness was taken out by the mathematic methods of energy ratios and energy difference ratios, thus obtaing the actual gas logging respond by way of eliminating the false appearance caused shaliness. A good geologic result has been achieved in applying the method to practice.