Journal of Seismic Exploration最新文献

Estimating seismic dispersion from prestack data using frequency-dependent AVO analysis 利用频率相关AVO分析从叠前数据估计地震频散

IF 0.5 4区地球科学

Journal of Seismic Exploration Pub Date : 2010-01-01 DOI: 10.1190/1.3513759

Xiaoyang Wu, M. Chapman, Xiang-Yang Li

{"title":"Estimating seismic dispersion from prestack data using frequency-dependent AVO analysis","authors":"Xiaoyang Wu, M. Chapman, Xiang-Yang Li","doi":"10.1190/1.3513759","DOIUrl":"https://doi.org/10.1190/1.3513759","url":null,"abstract":"Recent laboratory measurement studies have suggested a growing consensus that fluid saturated rocks can have frequency-dependent properties within the seismic bandwidth. It is appealing to try to use these properties for the discrimination of fluid saturation from seismic data. In this paper, we develop a frequency-dependent AVO (FAVO) attribute to measure magnitude of dispersion from pre-stack data. The scheme essentially extends the Smith and Gidlow (1987)’s two-term AVO approximation to be frequency-dependent, and then linearize the frequency-dependent approximation with Taylor series expansion. The magnitude of dispersion can be estimated with least-square inversion. A high-resolution spectral decomposition method is of vital importance during the implementation of the FAVO attribute calculation. We discuss the resolution of three typical spectral decomposition techniques: the short term Fourier transform (STFT), continuous wavelet transform (CWT) and Wigner-Vill Distribution (WVD) based methods. The smoothed pseudo Wigner-Ville Distribution (SPWVD) method, which uses smooth windows in time and frequency domain to suppress cross-terms, provides higher resolution than that of STFT and CWT. We use SPWVD in the FAVO attribute to calculate the frequency-dependent spectral amplitudes from pre-stack data. We test our attribute on forward models with different time scales and crack densities to understand wave-scatter induced dispersion at the interface between an elastic shale and a dispersive sandstone. The FAVO attribute can determine the maximum magnitude of P-wave dispersion for dispersive partial gas saturation case; higher crack density gives rise to stronger magnitude of P-wave dispersion. Finally, the FAVO attribute was applied to real seismic data from the North Sea. The result suggests the potential of this method for detection of seismic dispersion due to fluid saturation.","PeriodicalId":50054,"journal":{"name":"Journal of Seismic Exploration","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1190/1.3513759","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"65995583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 32

Predictive deconvolution by frequency domain Wiener filtering 预测反卷积的频域维纳滤波

IF 0.5 4区地球科学

Journal of Seismic Exploration Pub Date : 2007-01-01 DOI: 10.1190/1.2792997

M. Broadhead, C. Liner, T. Ulrych

引用次数: 1

Fusion Based Classification Method And Its Application 基于融合的分类方法及其应用

IF 0.5 4区地球科学

Journal of Seismic Exploration Pub Date : 2007-01-01 DOI: 10.1190/1.2792784

Long Jin, Mrinal K. Sen, P. Stoffa

引用次数: 4

Estimation of effective pressure and water saturation by viscoelastic inversion of synthetic time-lapse seismic data for a gas sandstone reservoir 含气砂岩储层时移合成地震资料粘弹性反演有效压力和含水饱和度

IF 0.5 4区地球科学

Journal of Seismic Exploration Pub Date : 2005-01-01 DOI: 10.1190/1.2148220

U. Tiwari, G. McMechan

{"title":"Estimation of effective pressure and water saturation by viscoelastic inversion of synthetic time-lapse seismic data for a gas sandstone reservoir","authors":"U. Tiwari, G. McMechan","doi":"10.1190/1.2148220","DOIUrl":"https://doi.org/10.1190/1.2148220","url":null,"abstract":"Summary Inversion of synthetic seismic data for a viscoelastic reservoir model produces estimates of changes in effective pressure (Pe) and water saturation (Sw). Application is to analysis of time-lapse seismic data for a gas sandstone reservoir. To generate synthetic time-lapse viscoelastic seismic data, reservoir properties [porosity (�-), clay content, permeability (k), Pe and Sw] are used to define the corresponding viscoelastic seismic properties [compressional and shear velocities (Vp and Vs), density (�! ) and compressional and shear quality factors (Qp and Qs)] using petro-seismic modeling. It is assumed that porosity, clay content and permeability do not change during production and are known. Full wavefield inversion is performed for different production scenarios, on synthetic viscoelastic time-lapse seismic data, using a grid search refined by a conjugate gradient solution. Estimation of unique values of Pe and Sw from two independent data (such as Vp/Vs and Qs/Qp) is feasible, if the other reservoir properties are known. Noisy data produces a range of solution values. The composite effect of ®Pe and ®Sw is approximately equal to the sum of the two separate effects. Seismic time-lapse changes are less sensitive to the pressure change than to changes in saturation. For the reservoir properties (�- , clay content, k), and the dominant seismic frequency used in the example, �! and Qs/Qp are most sensitive to Sw, Vp is most sensitive to Pe, and Vs, Qp and Qs and Vp/Vs are sensitive to both Sw and Pe.","PeriodicalId":50054,"journal":{"name":"Journal of Seismic Exploration","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2005-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"65880067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multiple Attenuation In the Plane Wave Domain By Match Filtering 基于匹配滤波的平面波域多重衰减

IF 0.5 4区地球科学

Journal of Seismic Exploration Pub Date : 1999-01-01 DOI: 10.1190/1.1820807

R. Pestana, P. Stoffa, Mrinal K. Sen

引用次数: 1