加核Wigner-Ville时频谱分解技术在大港油区含气性检测中的应用  

Application of decomposition technique of Wigner-Ville time-frequency spectrum with kernel function in gas content detection in Dagang Oilfield

作　　者：曾凡平 赵亮 徐甜 李冰玲 ZENG Fanping;ZHAO Liang;XU Tian;LI Bingling(Dongfang Geophysical Research Institute Dagang Branch,CNPC, Tian Jin, 300280, China;Resource Evaluation Office of Dagang Oilfield Company,CNPC, Tian Jin, 300280, China;Oil and Gas Development Office of Dagang Oilfield Company, CNPC, Tian Jin, 300280, China)

机构地区：[1]中国石油东方地球物理公司研究院大港分院,天津市300280 [2]中国石油大港油田公司资源评价处 [3]中国石油大港油田公司油气开发处

出　　处：《录井工程》2020年第2期41-46,共6页Mud Logging Engineering

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目“大港油区效益增储稳产关键技术研究与应用”(编号:2018E-11)。

摘　　要：大港油田板桥地区气层埋藏较深,且地震主频较低,预测难度大。鉴于Wigner-Ville时频分布具有较高的时频局域性、分辨能力和聚能性,但其交叉项的存在对分辨能力有较大干扰,采用在模糊函数域加Choi-Williams核函数窗方式进行Wigner-Ville时频计算,通过理论信号分析加核Wigner-Ville时频分布能较好地抑制交叉项且能保持其原有的优良特性。在实际的含气层识别应用中,首先从已钻井出发,开展井旁地震道时频谱分析,归纳含气层的时频变化规律,然后提取地震分频剖面,研究分频剖面与含气层之间的对应关系,选择其气层识别的优势频率体,应用于含气性预测。理论信号和实际资料研究表明,加核Wigner-Ville时频谱分解技术在含气层检测中具有一定的可行性。The gas reservoir is deeply buried in Banqiao area,Dagang Oilfield,and the low earthquake frequency makes it difficult to predict.Given the high time-frequency locality,resolving ability and energy-gathering ability of Winger-Ville time-frequency distribution,while its cross term greatly interferes the resolving ability,Choi-Williams kernel function window was added to the fuzzy function domain to calculate Wigner-Ville time-frequency.Analyzing kernel function added Wigner-Ville time-frequency distribution with theory signal can better restrain the cross term and maintain its original excellent characteristics.In practical application of gas bearing formation identification,first starting from drilled wells,carry out time-frequency spectrum analysis of seismic traces near the well,generalize the change rule of time-frequency of gas bearing formation,and extract seismic fractional frequency profile to study the correspondence between fractional frequency profile and gas bearing formation.Dominant frequency body in gas bearing formation identification was selected to apply to gas bearing prediction.Theory signal and actual data indicate that decomposition technique of Wigner-Ville time-frequency spectrum with kernel function has certain feasibility in gas bearing formation detection.

关 键 词：Wigner-Ville 时频分布 时频分析 含气层 大港油田 板桥地区 

分 类 号：TE132.1[石油与天然气工程—油气勘探]