Determination of petrophysical parameters of reservoirs in promising horizons and formations of the Bulla-Deniz field based on integrated well data (using Techlog software)
The Bulla-Deniz field which is characterised by deep wells has not been fully explored despite its commissioning since 1975. Consequently, the intersection of the Productive Series (PS) deposits has been drilled to the top of the Kirmaky group. The deposits of the sub-Kirmaky and Gala formations hav...
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S. Subbotin Institute of Geophysics of the NAS of Ukraine
2024
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| author | Kerimova, K.A. Samadli, U.Y. |
| author_facet | Kerimova, K.A. Samadli, U.Y. |
| author_sort | Kerimova, K.A. |
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| collection | OJS |
| datestamp_date | 2024-09-02T12:40:28Z |
| description | The Bulla-Deniz field which is characterised by deep wells has not been fully explored despite its commissioning since 1975. Consequently, the intersection of the Productive Series (PS) deposits has been drilled to the top of the Kirmaky group. The deposits of the sub-Kirmaky and Gala formations have not been exposed in the field area. The Bulla-Deniz field is located in the northern portion of the oil-gas region of the Baku archipelago, which is part of the Azerbaijani sector of the Caspian Sea. The structure was investigated through a comprehensive geophysical exploration program which included mapping, structure-search and logging datas.
The Bulla-Deniz structure is described in these materials as an asymmetric brachyanticline, extending in a northwest-southeast direction. Its dimensions are given as 27×9 km along the roof of the VII horizon and up to 1400 m high. The Bulla-Deniz fold is further complicated by the presence of longitudinal and transverse tectonic faults, which divide it into a number of tectonic blocks. The northeastern wing is divided into six tectonic blocks by six transverse faults. Two transverse fractures are noted in the southwestern wing, which divides the wing into 3 blocks (A, B and C blocks). In the geological cross-section of the Bulla-Deniz field, the sediments of the PS, Agcagil and Quaternary periods were identified in wells. The presence of Miocene sediments, as evidenced by excavations in the cross-section of neighboring deposits, is beyond doubt. The Miocene sediments have not been subjected to drilling studies. In consideration of the area’s geological tectonic structure, it can be postulated that the sediments underlying the PS may start at with the Pont floor, which is estimated to be 150 to 200 m thick. The intersection of the PS sediments was exposed by drilling wells to the top of the Kirmaky formation. The Sub-Kirmaky and Gala formations were not subjected to field investigation. In accordance with the classification system utilized by the Absheron division, the VIII horizon is identified as the Kirmaky sandy formation. Two sand-siltstone layers are observed in the lower and upper portions of the horizon. The VII horizon is equivalent to the «Fasilah» formation, as defined by the Absheron division. It is primarily composed of sandstones. Horizon V (corresponding to horizons VIII-IX according to the Absheron division) was represented by alternating layers of thick sand, sandstone and shale. The oil and gas in the Bulla-Deniz field are located within the V, VII, and VIII horizons of the PS. However, since these horizons in the southwestern wing have not been accessed through wells, their oil and gas content remains unknown. From this point of view, important issues such as detailed study of the Bulla-Deniz field, evaluation of its horizons and strata in terms of productivity, determination of its petrophysical parameters and calculation of reserves are still valid today.
The article deals with the determination of petrophysical parameters of reservoirs, calculation of oil reserves and determination of oil-water contact using complex well logging data on promising horizons and reservoirs of the productive series of the Bulla-Deniz field.
To solve the problem, the Techlog software was used to study the total and effective porosity, clay content, permeability, oil and gas saturation and water saturation of reservoirs in perspective reservoirs in terms of productivity on the basis of integrated log data from 6 well sections of the Bulla-Deniz oil and gas condensate field characterised by deep wells. The total volume of oil by wells in blocks A and B, separated by faults, was calculated according to our parameters, intervals of oil-water contact were determined and correlation by reservoirs was made for wells belonging to each block.
The density logging data were used to calculate the values of total and effective porosity of reservoirs for each well section and to construct curves characterising variations of these parameters over the survey interval. Given that these parameters are dynamic parameters of reservoir layers, the intervals of reservoir layers along the section were determined using these curves.
In the course of the research work for each well section we investigated, using electric logging data and Techlog software, we determined the intervals of the oil-water contact, determined oil- and water saturation parameters and established curves of their variation by depth. The curves were used to determine the intervals of water-bearing and oil-bearing layers in the section. Determination of the oil-water contact is of scientific and practical importance in determining the nature of the boundaries of the oil and water zones in the reservoir and identifying watered productive layers.
In this article, using the average values of parameters determined in the Bulla-Deniz field, the oil volume for blocks A and B separated by the fault and the total oil volume for the studied area were also calculated.
As well as in the detailed determination of petrophysical parameters, in determining the relationship between them, in the more precise calculation of reserves at the fields. |
| first_indexed | 2025-07-17T11:14:29Z |
| format | Article |
| id | journalsuranua-geofizicheskiy-article-310472 |
| institution | Geofizicheskiy Zhurnal |
| language | English |
| last_indexed | 2025-07-17T11:14:29Z |
| publishDate | 2024 |
| publisher | S. Subbotin Institute of Geophysics of the NAS of Ukraine |
| record_format | ojs |
| spelling | journalsuranua-geofizicheskiy-article-3104722024-09-02T12:40:28Z Determination of petrophysical parameters of reservoirs in promising horizons and formations of the Bulla-Deniz field based on integrated well data (using Techlog software) Визначення петрофізичних параметрів колекторів перспективних горизонтів і пластів родовища Булла-Деніз на підставі комплексних свердловиних даних (з використанням програмного забезпечення Techlog) Kerimova, K.A. Samadli, U.Y. well, logging, Techlog, interpretation, density, porosity, effective porosity, saturation, shale, oil-water contact well logging Techlog interpretation density porosity effective porosity saturation shale oil-water contact свердловина каротаж Techlog інтерпретація густина пористість ефективна пористість насиченість сланець водонафтовий контакт The Bulla-Deniz field which is characterised by deep wells has not been fully explored despite its commissioning since 1975. Consequently, the intersection of the Productive Series (PS) deposits has been drilled to the top of the Kirmaky group. The deposits of the sub-Kirmaky and Gala formations have not been exposed in the field area. The Bulla-Deniz field is located in the northern portion of the oil-gas region of the Baku archipelago, which is part of the Azerbaijani sector of the Caspian Sea. The structure was investigated through a comprehensive geophysical exploration program which included mapping, structure-search and logging datas. The Bulla-Deniz structure is described in these materials as an asymmetric brachyanticline, extending in a northwest-southeast direction. Its dimensions are given as 27×9 km along the roof of the VII horizon and up to 1400 m high. The Bulla-Deniz fold is further complicated by the presence of longitudinal and transverse tectonic faults, which divide it into a number of tectonic blocks. The northeastern wing is divided into six tectonic blocks by six transverse faults. Two transverse fractures are noted in the southwestern wing, which divides the wing into 3 blocks (A, B and C blocks). In the geological cross-section of the Bulla-Deniz field, the sediments of the PS, Agcagil and Quaternary periods were identified in wells. The presence of Miocene sediments, as evidenced by excavations in the cross-section of neighboring deposits, is beyond doubt. The Miocene sediments have not been subjected to drilling studies. In consideration of the area’s geological tectonic structure, it can be postulated that the sediments underlying the PS may start at with the Pont floor, which is estimated to be 150 to 200 m thick. The intersection of the PS sediments was exposed by drilling wells to the top of the Kirmaky formation. The Sub-Kirmaky and Gala formations were not subjected to field investigation. In accordance with the classification system utilized by the Absheron division, the VIII horizon is identified as the Kirmaky sandy formation. Two sand-siltstone layers are observed in the lower and upper portions of the horizon. The VII horizon is equivalent to the «Fasilah» formation, as defined by the Absheron division. It is primarily composed of sandstones. Horizon V (corresponding to horizons VIII-IX according to the Absheron division) was represented by alternating layers of thick sand, sandstone and shale. The oil and gas in the Bulla-Deniz field are located within the V, VII, and VIII horizons of the PS. However, since these horizons in the southwestern wing have not been accessed through wells, their oil and gas content remains unknown. From this point of view, important issues such as detailed study of the Bulla-Deniz field, evaluation of its horizons and strata in terms of productivity, determination of its petrophysical parameters and calculation of reserves are still valid today. The article deals with the determination of petrophysical parameters of reservoirs, calculation of oil reserves and determination of oil-water contact using complex well logging data on promising horizons and reservoirs of the productive series of the Bulla-Deniz field. To solve the problem, the Techlog software was used to study the total and effective porosity, clay content, permeability, oil and gas saturation and water saturation of reservoirs in perspective reservoirs in terms of productivity on the basis of integrated log data from 6 well sections of the Bulla-Deniz oil and gas condensate field characterised by deep wells. The total volume of oil by wells in blocks A and B, separated by faults, was calculated according to our parameters, intervals of oil-water contact were determined and correlation by reservoirs was made for wells belonging to each block. The density logging data were used to calculate the values of total and effective porosity of reservoirs for each well section and to construct curves characterising variations of these parameters over the survey interval. Given that these parameters are dynamic parameters of reservoir layers, the intervals of reservoir layers along the section were determined using these curves. In the course of the research work for each well section we investigated, using electric logging data and Techlog software, we determined the intervals of the oil-water contact, determined oil- and water saturation parameters and established curves of their variation by depth. The curves were used to determine the intervals of water-bearing and oil-bearing layers in the section. Determination of the oil-water contact is of scientific and practical importance in determining the nature of the boundaries of the oil and water zones in the reservoir and identifying watered productive layers. In this article, using the average values of parameters determined in the Bulla-Deniz field, the oil volume for blocks A and B separated by the fault and the total oil volume for the studied area were also calculated. As well as in the detailed determination of petrophysical parameters, in determining the relationship between them, in the more precise calculation of reserves at the fields. Родовище Булла-Деніз, що досліджене глибокими свердловинами, не було повністю розвідано, назважаючи на те, що введено в експлуатацію 1975 р. Отже, свердловинами розкрито перетин відкладів продуктивної товщі (ПТ), пробурено доверху групи Кирмаки. Відклади світ підкирмакинської та гала на території родовища не розкрито.З цього погляду такі важливі питання, як детальне вивчення родовища Булла-Деніз, оцінювання його горизонтів і пластів з точки зору продуктивності, визначення петрофізичних параметрів та підрахунок запасів актуальні й сьогодні.У статті розглянуто питання визначення петрофізичних параметрів пластів колекторів, підрахунку запасів нафти та визначення водонафтового контакту за комплексними даними геофізичних досліджень свердловин на перспективних горизонтах і пластах продуктивної товщі родовища Булла-Деніз.Для розв’язання задачі за допомогою програмного забезпечення Techlog були проведені дослідження загальної та ефективної пористості, глинистості, проникності, нафтогазононасиченості та водонасиченості колекторських пластів у перспективних пластах за продуктивністю на підставі комплексних даних геофізичних досліджень свердловин шесті розрізів свердловин нафтогазоконденсатного родовища Булла-Деніз. За заданими нами параметрами розрахований загальний обсяг нафти у свердловинах блоків А і Б, розділених розломами, визначено інтервали водонафтового контакту та проведено кореляцію пластів для свердловин, що належать кожному блоку. За даними щільнісного каротажу розраховано значення загальної та ефективної пористості колекторів для кожного розрізу свердловин і побудовано криві, що характеризують зміну цих параметрів на інтервалі дослідження. З огляду на те, що ці параметри є динамічними параметрами колекторних шарів, інтервали колекторних шарів розрізу визначалися за цими встановленими кривими.Під час дослідницької роботи для кожної дослідженої ділянки свердловини з використанням даних електричного каротажу та програмного забезпечення Techlog визначено інтервали водонафтового контакту, параметри нафто- і водонасиченості та побудовано криві їхньої зміни за глибиною. За цими кривими визначено інтервали водоносних і нафтоносних шарів у розрізі. Виявлення водонафтового контакту має наукове та практичне значення при визначенні характеру меж нафтової та водної зон у пласті та виділенні обводнених продуктивних пластів.За середніми значеннями параметрів родовища Булла-Деніз розраховано обсяг нафти окремо у блоках А і Б, розділених розломом, і загальний обсяг нафти у досліджуваній площі.Отримані результати дають підставу для формування науково-практичної думки щодо фільтраційно-ємнісних характеристик пластів-колекторів тих чи інших родовищ, а також для детального визначення петрофізичних параметрів, взаємозв’язку між ними, безпомилкового розрахунку запасів на родовищах. S. Subbotin Institute of Geophysics of the NAS of Ukraine 2024-09-02 Article Article application/pdf https://journals.uran.ua/geofizicheskiy/article/view/310472 10.24028/gj.v46i4.310472 Geofizicheskiy Zhurnal; Vol. 46 No. 4 (2024) Геофизический журнал; Том 46 № 4 (2024) Геофізичний журнал; Том 46 № 4 (2024) 2524-1052 0203-3100 en https://journals.uran.ua/geofizicheskiy/article/view/310472/302162 Copyright (c) 2024 K.A. Kerimova https://creativecommons.org/licenses/by-nc-sa/4.0 |
| spellingShingle | well logging Techlog interpretation density porosity effective porosity saturation shale oil-water contact well logging Techlog interpretation density porosity effective porosity saturation shale oil-water contact Kerimova, K.A. Samadli, U.Y. Determination of petrophysical parameters of reservoirs in promising horizons and formations of the Bulla-Deniz field based on integrated well data (using Techlog software) |
| title | Determination of petrophysical parameters of reservoirs in promising horizons and formations of the Bulla-Deniz field based on integrated well data (using Techlog software) |
| title_alt | Визначення петрофізичних параметрів колекторів перспективних горизонтів і пластів родовища Булла-Деніз на підставі комплексних свердловиних даних (з використанням програмного забезпечення Techlog) |
| title_full | Determination of petrophysical parameters of reservoirs in promising horizons and formations of the Bulla-Deniz field based on integrated well data (using Techlog software) |
| title_fullStr | Determination of petrophysical parameters of reservoirs in promising horizons and formations of the Bulla-Deniz field based on integrated well data (using Techlog software) |
| title_full_unstemmed | Determination of petrophysical parameters of reservoirs in promising horizons and formations of the Bulla-Deniz field based on integrated well data (using Techlog software) |
| title_short | Determination of petrophysical parameters of reservoirs in promising horizons and formations of the Bulla-Deniz field based on integrated well data (using Techlog software) |
| title_sort | determination of petrophysical parameters of reservoirs in promising horizons and formations of the bulla-deniz field based on integrated well data (using techlog software) |
| topic | well logging Techlog interpretation density porosity effective porosity saturation shale oil-water contact well logging Techlog interpretation density porosity effective porosity saturation shale oil-water contact |
| topic_facet | well logging Techlog interpretation density porosity effective porosity saturation shale oil-water contact well logging Techlog interpretation density porosity effective porosity saturation shale oil-water contact свердловина каротаж Techlog інтерпретація густина пористість ефективна пористість насиченість сланець водонафтовий контакт |
| url | https://journals.uran.ua/geofizicheskiy/article/view/310472 |
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