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MODELING AND CHARACTERIZATION OF ACHIMOV GAS-CONDENSATE RESERVOIR GEOLOGICAL, HYDRAULIC
SECTOR AND GEOLOGICAL CROSS SECTION 1 2 Akhmetov R.R. , Krainov S.A. (Russian Federation)
Email: [email protected]
'Akhmetov Radmir Rustemovich 4-year student;
2Krainov Sergei Alexeevich 4-year student, PETROLEUM ENGINEERIND DEPARTMENT, SAINT PETERSBURG MINING UNIVERSITY, SAINT PETERSBURG
Abstract: geological and hydrodynamic sector model of the deposit were developed in this paper. The geological cross section of the complex-lenticular structure of the Achimov strata was plotted. Then were described some crucial parameters of Achimov field and imaged on the figure. Porousness varied from 16 to 19%, but for considered 4 square km area it was equal to 16. Oil saturation was between 35 and 60%. It was found out that formation pressure and temperature were 270-310 MPa and 81-96°C respectively. The occurrence depth is 2750-3850 m. Thickness of permeable beds is up to 1-3 m.
Keywords: gas-condensate reservoir, geological model, hydraulic model.
МОДЕЛИРОВАНИЕ И ОПИСАНИЕ ГЕОЛОГИЧЕСКОГО И ГИДРАВЛИЧЕСКОГО СЕКТОРОВ АЧИМОВСКОГО
ГАЗОКОНДЕНСАТНОГО МЕСТОРОЖДЕНИЯ 1 2 Ахметов Р.Р. , Крайнов С.А. (Российская Федерация)
1Ахметов Радмир Рустемович - студент; 2Крайнов Сергей Алексеевич - студент, кафедра транспорта и хранения нефти и газа, Санкт-Петербургский горный университет, г. Санкт-Петербург
Аннотация: в статье были разработаны геологическая и гидравлическая модели месторождения. Также был построен геологический разрез пласта линзовидной структуры. Затем были описаны некоторые важные характеристики месторождения. Пористость, например, варьируется от 16 до 19%, но для рассматриваемой зоны площадью 4 квадратных километра она равна 16. Нефтенасыщение находится в диапазоне от 35 до 60%. Было установлено, что давление и температура пласта составляют 270-310 МПа и 81-96°C соответственно. Нефть залегает на глубине 2750-3850 метров. Толщина пластов составляет 1 -3 м.
Ключевые слова: газоконденсатное месторождение, геологическая модель, гидравлическая модель.
The Achimov deposits were formed about 130-140 Ma ago. The Achimov suite is located at a depth of about 4 kilometers, it belongs to the lowest level of the Lower Cretaceous deposits (over the Jurassic oil and gas complex) and is characterized by a complex geological structure in comparison with the Cenomanian deposits located at a depth of 1,100 to 1 700 meters, and Valanginian - at a depth of 1,700 to 3,200 meters. The thickness of the reservoir varies greatly [2, 3].
The Sredneobskoye oil and gas region, to which the Achmovskoye deposit belongs, is located in the middle course of the Ob River from Khanty-Mansiysk in the west to Aleksandrovsk in the East. By the end of the seventies of the 20th century, 57 deposits had already been discovered here. In some of them, a cluster of gas caps was discovered above the layers of oil deposits [1].
According to the Federal Agency for Subsoil Use of the Russian Federation, the content of condensate in the gas is 275 and 319 g/m3, respectively, for Ach3-4 and Ach5. The resulting condensate consists of sufficiently dense fractions - up to 800.7 kg / m3 with a paraffin content of less than 6.5%.
The rock of the reservoir is represented mainly by fine-grained calcareous sandstones and siltstones forming separate undeveloped seams and lenses. The sandstones and sandy siltstones in the Achimov section are present mainly in the eastern part - in the zone of the paleoscyllon. To the west, to the side of the development of the deep-water part of the paleobasene, the thickness of the layers is sharply reduced due to the disappearance of sandy and siltstone interlayers from the section. In the central and western parts, the Achimov section is represented mainly by low-power clay sediments. The geological structure of the Achimov deposits, for example, the northwest of the Surgut arch, is due to the presence of clearly expressed clinoforms, the distribution and structure of which should be taken into account at the stage of development of deposits. The Achimov beds are reservoirs with a very complex distribution of lenticular bodies. In the Achimov deposits, several local reference strata of clays 3-15 meters thick are distinguished. These strata divide the
Achimov strata into several independent layers. Lenticular form of sand bodies of the clinoform sequence, their reliable.
Isolation provide a dense package in space, so the potential deposits in such bodies are almost independent of anticlines, but are controlled by the intrinsic morphology of each individual lens and the quality of the collectors and represent rather a layering of a broken or stepped structure.
The reservoir of the field is characterized by poor and heterogeneous reservoir properties, low permeability, complicated by tectonic and lithological screens, characterized by a multiphase reservoir condition. In addition, the Achimov deposits are characterized by abnormally high reservoir pressure, more than 600 atmospheres, and the presence of heavy paraffins [5, 6].
The geological section of the Achimov strata is shown on Figure 1.
[6].
Fig. 1. Geological cross section of the complex-lenticular structure of the Achimov strata Here are some parameters of Achimov bend and its simple model reservoirs (Figure 2)
Fig. 2. Characteristics of the Achimov strata To sum up the above-mentioned, the sedimentation model, geological cross section of the complex-lenticular structure and characteristics of achimov field, could be plotted geological sector model of the Achimov field (Figure 3) [7].
Fig. 3. Geological and hydraulic sector model of the Achimov field
We could see from the figure that Achimov field has low conductivity, a large number of lenses and heterogeneity collection properties [8].
References in English / Список литературы на английском языке
1. Yushkov A. Y. Evaluation of cycling scenarios for Achimov formations of Urengoyskoye gas-condensate field. SPE Russian Petroleum Technology Conference, 26-28 October. Moscow. Russia, 2015.
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References / Список литературы
1. Юшков А.Ю. Оценка добычи газа при рециркуляции Ачимовского месторождения. СПЕ Российская конференция нефтегазовых технологий, 26-28 октября. Москва. Россия.
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7. Смачиваемость породы газоконденсатных месторождений при высоких температурах. Фэшес М., Фироозабади А. Ежегодная техническая конференция и выставка. Даллас, 2005.
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