基于广义S变换的吸收衰减分析技术在油气识别中的应用

广义S变换克服了小波基函数变化趋势固定不变的缺陷,具有较好的时频分析效果和较高的灵活性。将广义S变换引入到地震波吸收衰减分析中,应用最小二乘谱模拟方法消除地层反射系数对子波振幅谱的影响,突出含油气储层在地震记录上的响应;引入“低频增加、高频衰减”(LFR&HFA)面积差值法使得含油气储层的影响占主导地位,提高了油气识别的准确性。物理模型和实际地震资料的应用验证了上述方法的可行性;应用上述方法对实际地震资料进行油气识别,取得的结果与实际钻井结果吻合,证明了上述方法的实用性。

Application of absorption and attenuation analysis technique based on generalized S transform for hydrocarbon identification

Generalized S transform overcomes the defect of constant trend of wavelet window function,and has good time-frequency analysis and fine flexibility.We applied generalized S transform to absorption and attenuation analysis,and then least square spectrum simulation was adopted to remove the impact of formation reflectivity on wavelet amplitude spectrum.By utilizing "Low Frequency Resonance and High Frequency Attenuation" (LFR&HFA) area difference method,the impact of background such as wavelet and layer was eliminated,which improved the accuracy of hydrocarbon identification.We verified the validity and feasibility of above method through physical model and actual seismic data.The application of the method on actual seismic data shows that the achievements on hydrocarbon identification are coinciding with the actual drilling data.