Pub Date : 2019-06-03DOI: 10.3997/2214-4609.201900856
X. Chen, S. Xu, X. Qu, L. Qiu, Y. Liu
Summary There is a probability that the alkaline formation water occurs during diagenetic evolution. The alteration that alkaline fluid exerts on sandstones is also not negligible. Alkaline diagenesis emphasizes the role of alkaline fluid in the formation of secondary pores, which is the improvement and development of classical diagenesis theory. Based on the dissolution of quartz in the tight sandstone reservoir of Daniudi gas field, this abstract analysed the evidence of alkaline diagenesis and the effect of alkaline diagenesis on reservoir quality. The research includes water-rock simulation experiment, diagenetic minerals analysis, and the role of quartz dissolution on porosity. The water-rock simulation experiments and diagenetic minerals (illite and ferrocalcite) prove the inevitability of alkaline environment. Furthermore, the alkaline dissolution strength is the key to the tight sandstone reservoir in Daniudi gas field.
{"title":"Alkaline Diagenesis and Reservoir Quality of the Upper Paleozoic Tight Sandstones in Daniudi Gas Field, China","authors":"X. Chen, S. Xu, X. Qu, L. Qiu, Y. Liu","doi":"10.3997/2214-4609.201900856","DOIUrl":"https://doi.org/10.3997/2214-4609.201900856","url":null,"abstract":"Summary There is a probability that the alkaline formation water occurs during diagenetic evolution. The alteration that alkaline fluid exerts on sandstones is also not negligible. Alkaline diagenesis emphasizes the role of alkaline fluid in the formation of secondary pores, which is the improvement and development of classical diagenesis theory. Based on the dissolution of quartz in the tight sandstone reservoir of Daniudi gas field, this abstract analysed the evidence of alkaline diagenesis and the effect of alkaline diagenesis on reservoir quality. The research includes water-rock simulation experiment, diagenetic minerals analysis, and the role of quartz dissolution on porosity. The water-rock simulation experiments and diagenetic minerals (illite and ferrocalcite) prove the inevitability of alkaline environment. Furthermore, the alkaline dissolution strength is the key to the tight sandstone reservoir in Daniudi gas field.","PeriodicalId":6840,"journal":{"name":"81st EAGE Conference and Exhibition 2019","volume":"91 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84719863","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 : 2019-06-03DOI: 10.3997/2214-4609.201900826
Y. He, F. Hao, S. Dong, B. Wang
Least-squares reverse time migration (LSRTM) mitigates the illumination problems caused by complex geologic structures, nonuniform acquisition geometry and limited recording apertures. It is theoretically accurate in producing image gathers more suitable for amplitude versus offset (AVO) analysis. We apply image-domain LSRTM in the gather domain with nonstationary matching filters to generate LSRTM gathers with amplitude better preserved. The proposed flow can be applied on both offset and angle gathers with a flat AVO response demigration followed by a remigration. First, we use an acoustic synthetic example to illustrate the idea and verify the results. Then it is applied to a wide-azimuth (WAZ) survey in the Gulf of Mexico.
{"title":"Amplitude Preserved Least-squares RTM Gathers","authors":"Y. He, F. Hao, S. Dong, B. Wang","doi":"10.3997/2214-4609.201900826","DOIUrl":"https://doi.org/10.3997/2214-4609.201900826","url":null,"abstract":"Least-squares reverse time migration (LSRTM) mitigates the illumination problems caused by complex geologic structures, nonuniform acquisition geometry and limited recording apertures. It is theoretically accurate in producing image gathers more suitable for amplitude versus offset (AVO) analysis. We apply image-domain LSRTM in the gather domain with nonstationary matching filters to generate LSRTM gathers with amplitude better preserved. The proposed flow can be applied on both offset and angle gathers with a flat AVO response demigration followed by a remigration. First, we use an acoustic synthetic example to illustrate the idea and verify the results. Then it is applied to a wide-azimuth (WAZ) survey in the Gulf of Mexico.","PeriodicalId":6840,"journal":{"name":"81st EAGE Conference and Exhibition 2019","volume":"59 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84801371","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 : 2019-06-03DOI: 10.3997/2214-4609.201901237
Chris Willacy, P. Bogert, E. V. Dedem, J. Blokland
Summary The results from microseismic event locations, derived using an elastic full waveform matching algorithm, have been used to constrain dynamic rupture models to better understand induced fault rupture geomechanics. This workflow has been applied to events recorded by the shallow borehole network installed at the Groningen gas field in The Netherlands. Focal angles derived from moment tensor inversion are seen to provide a good match to the fault strike angles, but fault dip is poorly constrained along with the seismic interpretation. This is due to the limited vertical resolution of the available datasets. Dynamic rupture modelling was performed to constrain the slip patch size and displacement, using a linear slip weakening relationship. On one example fault, where several events have occurred over the past few years, microseismic activity from small magnitude events likely transferred stress to neighboring areas of the fault, which accumulated over time and finally resulted in a larger magnitude earthquake which ruptured over a 350m length of the fault.
{"title":"Constraining Fault Geomechanics Using Elastic Waveform Inversion and Dynamic Rupture Modelling","authors":"Chris Willacy, P. Bogert, E. V. Dedem, J. Blokland","doi":"10.3997/2214-4609.201901237","DOIUrl":"https://doi.org/10.3997/2214-4609.201901237","url":null,"abstract":"Summary The results from microseismic event locations, derived using an elastic full waveform matching algorithm, have been used to constrain dynamic rupture models to better understand induced fault rupture geomechanics. This workflow has been applied to events recorded by the shallow borehole network installed at the Groningen gas field in The Netherlands. Focal angles derived from moment tensor inversion are seen to provide a good match to the fault strike angles, but fault dip is poorly constrained along with the seismic interpretation. This is due to the limited vertical resolution of the available datasets. Dynamic rupture modelling was performed to constrain the slip patch size and displacement, using a linear slip weakening relationship. On one example fault, where several events have occurred over the past few years, microseismic activity from small magnitude events likely transferred stress to neighboring areas of the fault, which accumulated over time and finally resulted in a larger magnitude earthquake which ruptured over a 350m length of the fault.","PeriodicalId":6840,"journal":{"name":"81st EAGE Conference and Exhibition 2019","volume":"1997 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88163585","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 : 2019-06-03DOI: 10.3997/2214-4609.201900899
V. Vinje, T. Elboth
Summary Placing marine sources on the top of the seismic streamer spread improves resolution and reservoir inversion in shallow and intermediate depth targets. This is due to the abundance of near offset data and high illumination compared to conventional marine seismic. A drawback of this top source solution is the lack of long offsets, which are important for deeper imaging and AVO. In this paper, we present a combined solution with sources on both the top and in the front of the spread. We deploy the front sources from the streamer vessel, while a separate dedicated source vessel is towing the widely separated top sources on top of the spread. With successful deblending of the different sources, this solution could give an operationally efficient solution to the seismic imaging and inversion problem, for both shallow and deep targets, and providing both high and low frequencies. We will present the acquisition concept and describe the deblending strategy, to address the common challenge to any multiple-source blended acquisition.
{"title":"Hunting High and Low in Marine Seismic Acquisition; Combining Wide-Tow Top Sources with Front Sources","authors":"V. Vinje, T. Elboth","doi":"10.3997/2214-4609.201900899","DOIUrl":"https://doi.org/10.3997/2214-4609.201900899","url":null,"abstract":"Summary Placing marine sources on the top of the seismic streamer spread improves resolution and reservoir inversion in shallow and intermediate depth targets. This is due to the abundance of near offset data and high illumination compared to conventional marine seismic. A drawback of this top source solution is the lack of long offsets, which are important for deeper imaging and AVO. In this paper, we present a combined solution with sources on both the top and in the front of the spread. We deploy the front sources from the streamer vessel, while a separate dedicated source vessel is towing the widely separated top sources on top of the spread. With successful deblending of the different sources, this solution could give an operationally efficient solution to the seismic imaging and inversion problem, for both shallow and deep targets, and providing both high and low frequencies. We will present the acquisition concept and describe the deblending strategy, to address the common challenge to any multiple-source blended acquisition.","PeriodicalId":6840,"journal":{"name":"81st EAGE Conference and Exhibition 2019","volume":"78 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88179971","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 : 2019-06-03DOI: 10.3997/2214-4609.201901252
G. Yu, Y. Chen, J. Wu, Y. Li, F. Li, G. Hu, Z. Ran, Y. Rao
{"title":"3D-VSP Survey Using a DAS System and Downhole Geophone Array in Southwest China","authors":"G. Yu, Y. Chen, J. Wu, Y. Li, F. Li, G. Hu, Z. Ran, Y. Rao","doi":"10.3997/2214-4609.201901252","DOIUrl":"https://doi.org/10.3997/2214-4609.201901252","url":null,"abstract":"","PeriodicalId":6840,"journal":{"name":"81st EAGE Conference and Exhibition 2019","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77294390","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 : 2019-06-03DOI: 10.3997/2214-4609.201901087
N. T. Huyen, T. X. Cuong, T. D. Cuong, B. H. Hoang, N. Tuan, N. Anh, B. V. Dung, N. Hieu, H. Tuan, P. T. Vien, M. Fyhn, H. Jussi, L. Nielsen, I. Abatzis, N. Quan
{"title":"Charactersictics of Syn Rift Sediments in the Northern Song Hong Basin and its Petroleum System Association","authors":"N. T. Huyen, T. X. Cuong, T. D. Cuong, B. H. Hoang, N. Tuan, N. Anh, B. V. Dung, N. Hieu, H. Tuan, P. T. Vien, M. Fyhn, H. Jussi, L. Nielsen, I. Abatzis, N. Quan","doi":"10.3997/2214-4609.201901087","DOIUrl":"https://doi.org/10.3997/2214-4609.201901087","url":null,"abstract":"","PeriodicalId":6840,"journal":{"name":"81st EAGE Conference and Exhibition 2019","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85307243","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 : 2019-06-03DOI: 10.3997/2214-4609.201900976
Daniela Teodor, C. Comina, L. Socco, F. K. Anjom, J. Virieux, R. Brossier, P. Trinh
{"title":"Elastic Full Waveform Inversion Tests for Shallow Targets Reconstruction from Surface Waves Analysis Based Initial Models","authors":"Daniela Teodor, C. Comina, L. Socco, F. K. Anjom, J. Virieux, R. Brossier, P. Trinh","doi":"10.3997/2214-4609.201900976","DOIUrl":"https://doi.org/10.3997/2214-4609.201900976","url":null,"abstract":"","PeriodicalId":6840,"journal":{"name":"81st EAGE Conference and Exhibition 2019","volume":"6 6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90735952","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 : 2019-06-03DOI: 10.3997/2214-4609.201901637
R. Aguilar, R. Villarroel
{"title":"3D Models Optimisation With Real Data, Is It Possible? Field In Production Case Study","authors":"R. Aguilar, R. Villarroel","doi":"10.3997/2214-4609.201901637","DOIUrl":"https://doi.org/10.3997/2214-4609.201901637","url":null,"abstract":"","PeriodicalId":6840,"journal":{"name":"81st EAGE Conference and Exhibition 2019","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91248302","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 : 2019-06-03DOI: 10.3997/2214-4609.201901417
N. Boehm, C. Niño-Guiza, T. Martins
Source rocks from the Santos basin pre-salt in Brazil, namely the Itapema and Picarras formations, are characterized based on their total organic carbon content (TOC) with the aid of an acoustic inversion and TOC data from wells. The inverted P-impedance volume is converted into a %TOC volume by applying a formula (empirically derived from well data) that relates P-impedance to TOC. The derived %TOC volume is corrected for compaction in order to compensate for the effect burial has on the P-impedance volume. This %TOC volume aids in the mapping of the source rocks and their extent. It is found that source rocks from within the deeper rift section (where no well data is available) are thicker and that their %TOC increases with depth. A rise in %TOC is indicative of more primary production or better preservation potential (more anoxic conditions) at the time of deposition. Deposition rates for the source rock and subsidence must have been higher in the depocenter of the lower syn-rift in order to account for the thicker source rock deposits.
{"title":"Source Rock Characterization Using Seismic Attributes: a Study from the Santos Basin (Offshore Brazil)","authors":"N. Boehm, C. Niño-Guiza, T. Martins","doi":"10.3997/2214-4609.201901417","DOIUrl":"https://doi.org/10.3997/2214-4609.201901417","url":null,"abstract":"Source rocks from the Santos basin pre-salt in Brazil, namely the Itapema and Picarras formations, are characterized based on their total organic carbon content (TOC) with the aid of an acoustic inversion and TOC data from wells. The inverted P-impedance volume is converted into a %TOC volume by applying a formula (empirically derived from well data) that relates P-impedance to TOC. The derived %TOC volume is corrected for compaction in order to compensate for the effect burial has on the P-impedance volume. This %TOC volume aids in the mapping of the source rocks and their extent. It is found that source rocks from within the deeper rift section (where no well data is available) are thicker and that their %TOC increases with depth. A rise in %TOC is indicative of more primary production or better preservation potential (more anoxic conditions) at the time of deposition. Deposition rates for the source rock and subsidence must have been higher in the depocenter of the lower syn-rift in order to account for the thicker source rock deposits.","PeriodicalId":6840,"journal":{"name":"81st EAGE Conference and Exhibition 2019","volume":"53 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91281402","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 : 2019-06-03DOI: 10.3997/2214-4609.201901063
S. Levashov, A. Samsonov, M. Yakymchuk, I. Korchagin, D. Bozhezha
{"title":"Prognosis of petroleum commercial inflow receiving in wells, drilled in 2016–2018 on block in Black Sea","authors":"S. Levashov, A. Samsonov, M. Yakymchuk, I. Korchagin, D. Bozhezha","doi":"10.3997/2214-4609.201901063","DOIUrl":"https://doi.org/10.3997/2214-4609.201901063","url":null,"abstract":"","PeriodicalId":6840,"journal":{"name":"81st EAGE Conference and Exhibition 2019","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89680125","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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