Pub Date : 1997-05-01DOI: 10.1306/3B05BFEC-172A-11D7-8645000102C1865D
G. Beck
{"title":"Examination Of Mwd Wireline Replacement By Decision Analysis Methods: Two Case Histories","authors":"G. Beck","doi":"10.1306/3B05BFEC-172A-11D7-8645000102C1865D","DOIUrl":"https://doi.org/10.1306/3B05BFEC-172A-11D7-8645000102C1865D","url":null,"abstract":"","PeriodicalId":306484,"journal":{"name":"The Log Analyst","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124409131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-08-01DOI: 10.1016/0926-9851(96)00003-1
H. Collier, J. Parra
{"title":"Utilization Of Interwell Seismic Logging For Formation Continuity At The Gypsy Test Site, Oklahoma","authors":"H. Collier, J. Parra","doi":"10.1016/0926-9851(96)00003-1","DOIUrl":"https://doi.org/10.1016/0926-9851(96)00003-1","url":null,"abstract":"","PeriodicalId":306484,"journal":{"name":"The Log Analyst","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"118943557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Devleopment Of A Spectral Litho-density Logging Tool By Use Of Empirical Methods","authors":"D. Gearhart, G. Mathis","doi":"10.1190/1.1892929","DOIUrl":"https://doi.org/10.1190/1.1892929","url":null,"abstract":"","PeriodicalId":306484,"journal":{"name":"The Log Analyst","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132000273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Deconvolution Of Well Log Data - An Innovations Approach","authors":"W. D. Lyle, D. Williams","doi":"10.1190/1.1892927","DOIUrl":"https://doi.org/10.1190/1.1892927","url":null,"abstract":"","PeriodicalId":306484,"journal":{"name":"The Log Analyst","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115849492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1016/0148-9062(78)90931-2
L. Smits, B. A. Lavers
{"title":"Recent Developments In Coal Petrophysics","authors":"L. Smits, B. A. Lavers","doi":"10.1016/0148-9062(78)90931-2","DOIUrl":"https://doi.org/10.1016/0148-9062(78)90931-2","url":null,"abstract":"","PeriodicalId":306484,"journal":{"name":"The Log Analyst","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116772777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.29118/ipa.181.161.198
J. Goetz, W. J. Prins, J. Logar
Abstract Wireline logs provide complete records of all formations in a well. Log responses are functions of lithology, porosity, fluid content and textural variations of informations. This information, coupled with characteristics of sedimentary structures derived from high resolution dipmeter surveys, provide clues to the sedimentary environment and allow estimation of the reservoir geometry and orientation. A set of depositional models is established for the production geologist. A new technique designed to make rapid and accurate multiple formation pressure measurements confirms the hydraulic separation or connection of reservoirs.
{"title":"Reservoir Delineation by Wireline Techniques","authors":"J. Goetz, W. J. Prins, J. Logar","doi":"10.29118/ipa.181.161.198","DOIUrl":"https://doi.org/10.29118/ipa.181.161.198","url":null,"abstract":"Abstract Wireline logs provide complete records of all formations in a well. Log responses are functions of lithology, porosity, fluid content and textural variations of informations. This information, coupled with characteristics of sedimentary structures derived from high resolution dipmeter surveys, provide clues to the sedimentary environment and allow estimation of the reservoir geometry and orientation. A set of depositional models is established for the production geologist. A new technique designed to make rapid and accurate multiple formation pressure measurements confirms the hydraulic separation or connection of reservoirs.","PeriodicalId":306484,"journal":{"name":"The Log Analyst","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127940398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1016/0148-9062(78)90934-8
A. J. Rudman, J. F. Whaley, R. F. Blakely, Maurice E. Biggs
{"title":"Transformation Of Resistivity To Pseudo -velo City Logs","authors":"A. J. Rudman, J. F. Whaley, R. F. Blakely, Maurice E. Biggs","doi":"10.1016/0148-9062(78)90934-8","DOIUrl":"https://doi.org/10.1016/0148-9062(78)90934-8","url":null,"abstract":"","PeriodicalId":306484,"journal":{"name":"The Log Analyst","volume":"237 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133558402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Average semblance and maximum-likelihood spectral analyses are applied to synthetic and field full waveform acoustic logging data to determine formation velocities. Of particular interest is the ability of these methods to resolve the P and shear/pseudoRayleigh arrivals in data from poorly-bonded cased boreholes. In synthetic open-hole data the velocity analyses yield results within 4% of the true velocities. Results from synthetic well-bonded cased hole data are generally as good as those from the open hole data. However, if the formation P-wave velocity is within roughly 10% of the plate velocity of the steel pipe (about 5.3-5.5 km/s), then there may be a resonance effect that appears to slow down the P wave slightly (on the order of 6%). For cased-hole models with no steel/cement bonding (the free-pipe situation), the measured P-wave velocities are typically 6 to 8% less than the actual formation velocities. If the formation S-wave velocity is greater than about 2.5 km/s, the S-wave velocity estimate may also be 6 to 8% low. Furthermore, increasing the thickness of either the cement layer or the fluid layer between the pipe and the cement further decreases the formation velocity estimates. Also, if the P-wave velocity is within roughly 15% of the velocity of the steel arrival, the P wave may not be resolved by the semblance method unless the data is first low-pass filtered. Initial tests show that this filtering process may adversely affect the final P-wave velocity estimate, but the details of this type of approach have not been studied. The P wave is resolved. by spectral analysis of the original, nnfiltered data. For cased-hole models with no cement/formation bonding (the unbonded-casing 366 Block et al. situation), formation S-wave velocities are estimated to within 3% relative error, and the formation P-wave velocity is estimated to within 2% error in a slow formation. However, for P-wave velocities between 3.4 km/s and 5.94 km/a, the P wave cannot be resolved by spectral analysis, and it is resolved by the semblance method only in the model with the low velocity (3.4 km/s).
{"title":"Velocity Analysis of Multi-Receiver Full Waveform Acoustic Logging Data In Open and Cased Holes","authors":"L. Block, Chuen Hon Arthur Cheng, G. Duckworth","doi":"10.1190/1.1893094","DOIUrl":"https://doi.org/10.1190/1.1893094","url":null,"abstract":"Average semblance and maximum-likelihood spectral analyses are applied to synthetic and field full waveform acoustic logging data to determine formation velocities. Of particular interest is the ability of these methods to resolve the P and shear/pseudoRayleigh arrivals in data from poorly-bonded cased boreholes. In synthetic open-hole data the velocity analyses yield results within 4% of the true velocities. Results from synthetic well-bonded cased hole data are generally as good as those from the open hole data. However, if the formation P-wave velocity is within roughly 10% of the plate velocity of the steel pipe (about 5.3-5.5 km/s), then there may be a resonance effect that appears to slow down the P wave slightly (on the order of 6%). For cased-hole models with no steel/cement bonding (the free-pipe situation), the measured P-wave velocities are typically 6 to 8% less than the actual formation velocities. If the formation S-wave velocity is greater than about 2.5 km/s, the S-wave velocity estimate may also be 6 to 8% low. Furthermore, increasing the thickness of either the cement layer or the fluid layer between the pipe and the cement further decreases the formation velocity estimates. Also, if the P-wave velocity is within roughly 15% of the velocity of the steel arrival, the P wave may not be resolved by the semblance method unless the data is first low-pass filtered. Initial tests show that this filtering process may adversely affect the final P-wave velocity estimate, but the details of this type of approach have not been studied. The P wave is resolved. by spectral analysis of the original, nnfiltered data. For cased-hole models with no cement/formation bonding (the unbonded-casing 366 Block et al. situation), formation S-wave velocities are estimated to within 3% relative error, and the formation P-wave velocity is estimated to within 2% error in a slow formation. However, for P-wave velocities between 3.4 km/s and 5.94 km/a, the P wave cannot be resolved by spectral analysis, and it is resolved by the semblance method only in the model with the low velocity (3.4 km/s).","PeriodicalId":306484,"journal":{"name":"The Log Analyst","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122675838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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