PreviousNext No AccessInternational Conference on Engineering Geophysics, Al Ain, United Arab Emirates, 9-12 October 2017Seismic analysis for predicting potential drilling hazards of deep-wells that may cause environmental disastersAuthors: O.L. KuznetsovI.A. ChirkinA.A. RadwanE.G. RizanovAhmed IsmailS.M. KarnaukhovA.A. YurovO.L. KuznetsovDubna State University, Dubna, Moscow region, RussiaSearch for more papers by this author, I.A. ChirkinDubna State University, Dubna, Moscow region, RussiaSearch for more papers by this author, A.A. RadwanDubna State University, Dubna, Moscow region, Russia, and Al-Azhar University, Assiut, EgyptSearch for more papers by this author, E.G. RizanovDubna State University, Dubna, Moscow region, Russia, and Geoseis company, Moscow, RussiaSearch for more papers by this author, Ahmed IsmailOklahoma State University, Stillwater, Oklahoma, USASearch for more papers by this author, S.M. KarnaukhovMoscow Branch of Gazprom EP International B.V., Moscow, RussiaSearch for more papers by this author, and A.A. YurovGeoseis company, Moscow, RussiaSearch for more papers by this authorhttps://doi.org/10.1190/iceg2017-071 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Drilling hazards such as kicks, wellbore instability and loss of mud circulation may occur when the well penetrates a fractured formation. In extreme cases, a well blowout may occur resulting in massive environmental disasters. Detection of formation fractures` nature, density and geodynamics will help to avoid many of these hazardous situations. We demonstrate an approach to study and predict formation fractures` parameters based on a specific analysis of the acquired 3D seismic data from the well site. The method of seismic analysis that we refer to here was developed by the Geosystem State Research Center of Russian Federation and called Side-View Seismic Location (SVSL). The method utilizes the scattered seismic waves to characterize the open fractures in geological formationformation. The SVSL method allows studying the spatial distribution of open fractures by implementing specific SVSL analysis of 2D or 3D seismic data. The SVSL method can also monitor time-spatial 4D distribution of open fractures in the geological formations. We have tested the SVSL method at oilfields in the Republic of Tatarstan, Orenburg, and Tyumen regions to estimate the fractures` parameters, formation pressure, and consequently predict drilling hazards. Another interesting finding was estimating the right time for drilling through fractured formations and reducing potential drilling problems. As solid lunar tides affect the dilation and compaction of open fractures, we have found that the periods of high tides represent better drilling time because open fractures slightly close, so the loss of mud circulation through the fractures could be minimized. Keywords: environmental, riskPermalink: https://doi.org/10.1190/iceg2017-071FiguresReferencesRelatedDetails International Conference on Engineering Geophysics, Al Ain, United Arab Emirates, 9-12 October 2017ISSN (online):2159-6832Copyright: 2017 Pages: 382 publication data© 2017 Published in electronic format with permission by Society of Exploration Geophysicists (SEG)Publisher:Society of Exploration Geophysicists HistoryPublished Online: 12 Oct 2017 CITATION INFORMATION O.L. Kuznetsov, I.A. Chirkin, A.A. Radwan, E.G. Rizanov, Ahmed Ismail, S.M. Karnaukhov, and A.A. Yurov, (2017), "Seismic analysis for predicting potential drilling hazards of deep-wells that may cause environmental disasters," SEG Global Meeting Abstracts : 384-387. https://doi.org/10.1190/iceg2017-071 Plain-Language Summary KeywordsenvironmentalriskPDF DownloadLoading ...

The experience of applying microseismic infrasonic exploration method ANCHAR to the timelapse monitoring the outlines of pay zones of oil and gas reservoirs under production accounts for more than 10 years. Presented are results of microseismic monitoring for a number of targets – Kaluga underground gas storage facility, Orenburg oil-gas-condensate field and etc. In all these studies the position and displacement of the outlines of pay zones were reliably fixed by microseismic and verified by independent methods. The results demonstrate high prospects of applying the ANCHAR monitoring to post-exploration and operation of HC reservoirs and underground gas storage facilities.

Considered is application of passive seismic monitoring technology SLEC (Seismic Location of Emission Centers) to survey the heterogeneity of oil saturation of reservoir in one of the fields of Orenburg region (Volga-Ural area, Russia). Presented is a brief description of SLEC technology designed for surface-based passive monitoring of seismic emission of geological formations and estimation of characteristics of reservoirs, particularly, reservoir fluid saturation type. Among benefits of SLEC technology are its surface based observation system and the use of Slionkin Focusing Transformation algorithms allowing to focus SLEC locator to any points of a geological formation (within the range of a few kilometers), thus allowing distinguish between useful and interference sources of emission signals. Presented are results of long-term SLEC monitoring. A comparison of SLEC processing results – map of oil saturation index versus production data acquired in operating wells and well test data supports the reliability of SLEC-based maps of reservoir oil saturation heterogeneity. These heterogeneity maps can be used to improve the efficiency of oil production and for post-exploration of the field.

Considered are results of applying the multiwave seismic technologies based on the use of different types of seismic waves: reflected, scattered waves and waves of infrasonic seismic emission of hydrocarbon beds to solution of basic problems of prospecting HC reservoirs under complicated conditions of salt-dome tectonics. The use of multiwave seismic technologies allows solve such problems as building a detail structural plan, mapping fractured zones and identifying oil and gas saturation of reservoirs. By way of example considered is solution of these problems for the south of Cis-Ural Trough, particularly for the Akobinsk area.

Analyzed are results of applying the Side-View Seismic Location method (SVSL) in combination with other seismic methods to solution of main problems of HC exploration in complicated geological settings of Orenburg region and Kuyumba oil field in East Siberia. Combination of SVSL and other seismic methods (CMP) allows solve such problems as building a structural model, mapping of fractured zones and fluid migration pathways. By way of examples considered is solution of these problems for the south of Cis-Ural through, particularly, for the Akobinsk area featuring a material effect of salt-dome tectonics. The second part of the paper presents results of applying SVSL to mapping the open fracturing of rocks, refining the geological model of Riphean complex of East Siberia (Kuyumba oil field) in combination with the structural seismic (2D CDP), and identification of fractured zones which are promising drilling targets. Proposed is a technique for identifying reefogenic structures in the depth interval of Riphean complex. This allows substantially improve the reliability of geological predictions when selecting optimal drilling sites to achieve maximum oil flow rate in exploratory wells.

Microseismic and infrasonic technology of oil and gas prospecting ANCHAR had been devised in Russia and patented in 1992, then in 1998. First industrial application of the technology start in 1994 in Russia, then was kept on in Russia and took place in Kazahstan, and beyond the bounds of FSU in Morocco and Bulgaria (ADD-HR).Basically, the technology of stimulation of a geologic area by seismic source in use, rarely – its ‘light’ modification. In the use of microseismic prospecting methods like ‘passive’ ANCHAR, its imitation HyMAS, and etc. which don’t apply any artificial seismic sources a number of principle problems has been found by the authors of the technology. On basis of the discovered quality of Microseismic Background Noise Order in the areas of HC beds a new Entropy Criterion of HC identification has been formulated that solved a part of the problems in using of ‘passive’ ANCHAR and its analogues.For the period of more than 10 years of using the technology there were tested 75 exploring and prospecting wells. Success factor was more than 80%.

P306 STUDY OF FRACTURING OF DEEP SUBSALT RESERVOIRS (MARGIN OF CASPIAN BASIN) BY SVSL METHOD 1 S.I. IVANOV 1 S.M. KARNAUKHOV 1 I.A. CHIRKIN 2 B.Y. MELTCHOUK 2 A.S. ZHUKOV* 2 A.V. VOLKOV 2 1 – ORENBURGGAZPROM Ltd Orenburg 2 - VNIIGEOSYSTEM State Research Center of RF Moscow 1197105 Russia Summary Demonstrated is the possibility of applying Side-View Seismic Location method (SVSL) to study the open fracturing of subsalt reservoirs seated at the depth of 4 5 - 7 km in the north-east part of the margin of Caspian basin. Comparison of SVSL data about the fracturing of geomedium and

C045 OPTIMIZATION OF PRODUCTION IN FRACTURED RESERVOIRS USING THE SVSL DATA ON OPEN FRACTURING 1 Summary Information about a 3D distribution of open fracturing acquired by the SVSL (Side-View Seismic Location) study of scattered seismic waves is of much use for improving the production of HC reserves. Considered is the use of SVSL data to solving such geological and production problems as finding the optimal sites for production wells selecting an optimal azimuthal direction when drilling horizontal wells selecting wells for hydrofrac and other operations. Presented are examples of these applications in the fields of West and East Siberia Republic

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