基于时频分析的储层裂缝识别方法学习笔记.docVIP

基于时频分析的储层裂缝识别方法( 司马立强，杨洪鹏，姚军朋，张凤生，李勇 （西南石油大学资源与环境学院四川 成都 610500裂缝储层汉明窗函数239和29个采样点长dentification of fracture bases on time-frequency analysis in reservoir SIMA Li-Qiang, YANG Hong-Peng, YAO Jun-Peng, Zhang Feng-Sheng, LI Yong ( Department of Resource and Environment, Southwest Petroleum University, Chengdu 610500 China ) Abstract ?Accurately identify fracture is significant for the development of oil and gas in the fractured reservoirs, commonly use the size and difference of bilateral resistivity to identify the fracture, because it is also affected by other factors, the resolution of the fracture identification is not high. To solve these problems, this paper study the principle of time-frequency analysis and short time Fourier transform, and then discuss the implicit information of the fracture in the dual laterolog by using the time-frequency analysis, which can improve the ability to identify fractures. The method is applied to a number of wells in Tarim Oilfield, the results show that using Hamming window function and selecting 239 and 29 samples of the long and short window function to strike the amplitude and spectrum of the resistivity curves, which can greatly improve the ability to distinguish fracture. The method of the identification of the fracture is based on striking a short time Fourier Transform in the resistivity curve to get the spectrum characteristics, which is expanding techniques and methods of identifying fracture with the conventional resistivity logging. Keywords bilateral resistivity, time-frequency analysis, short time Fourier transform, fracture identification 1 引言 准确识别裂缝对裂缝性储层油气开发具有重要意义。油气层裂缝的常规测井识别理论以双侧向电阻率水槽实验和数值模拟[1]为基础，基于双侧向测井电阻率的大小差异性而提出[2]，实践应用取得了一定成效。由于油气层中裂缝的“复杂性”和“特殊性”该方法受到了较大程度的限制，在双侧向测井过程中电阻率大小变化和差异性“模糊化”，加之其它因素的影响，导致识别，识别效果不够理想。因此，挖掘双侧向电阻率上隐含的裂缝信息将更有于识别裂缝。时频分析是研究非平稳信号的一种有效方法，通过在时频平面上表述信号的时变特征，能够更清晰地呈现信号频率特性随时间的变化。 因此，本文针对双侧向测井裂缝识别上的不足和时频分析在数据信息挖掘中的优势，利用短时博里叶变换方法对碳酸盐岩裂缝型储层的识别进行探索性研究，该方法短时傅立叶变换STFT）是最早和最常用的一种时频分析方法，是傅立叶变换的