Forecast of the oil and gas prospects of the Jurassic deposits of the Bukhara-Khiva region by the hydrodynamic method

T. Kh. Shoimurotov; K. B. Yusupov; S. T. Rakhmanova

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Forecast of the oil and gas prospects of the Jurassic deposits of the Bukhara-Khiva region by the hydrodynamic method

Прогноз перспективы нефтегазоносности юрских отложений Бухаро-Хивинского региона гидродинамическим методом

T. Kh. Shoimurotov¹, K. B. Yusupov¹, S. T. Rakhmanova²

Institute of Geology and Exploration of Oil and Gas Fields (IGIRNIGM), Tashkent, Uzbekistan
University of Geological Sciences, Tashkent, Uzbekistan

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Publisher’s page

Geologiya fanlari universiteti xabarlari (Bulletin of the University of Geological Sciences), No. 2

Date2024

Issue2024, pp. 5–18

LanguageRussian (Uzbek and English abstracts)

LicenceNot stated

Highlights

Lower–Middle Jurassic reduced heads: 2,322–2,747 m (east Beshkent trough) to 199–343 m (Karim, Rasylkuduk and others).
Beshkent trough: permeability 0.0001 darcy, porosity 4%; in anomalous zones hydraulic gradient 21.8–42.8 m/km and filtration velocity 1.4–3.6 cm/year.
East flank of the Dengizkul uplift: permeability 0.0001–0.0008 darcy, porosity 6–7%, hydraulic gradient 7.4–58 m/km.
Abnormally high pressure in 16 of 42 measurements (coefficient above 1.20).
Anomaly coefficients: Chilgumbaz 1.92, Beshkent 1.74, Kamashi 1.73, Nishan 1.55, Chulkuvar 1.49, Feruza 1.44, Izgancha 1.43, Jambulak 1.36, Sherkent 1.31, Mangit 1.31.
Upper Jurassic heads fall from 1,096 m (Karail) to 800–900 m (Buzakhur) along the Lyangar–Karail fault.

Keywords

pressure head
hydrodynamics
formation water
abnormally high pressure
Jurassic
Bukhara–Khiva region
Beshkent trough

Summary

Written for oil and gas exploration, the paper maps reduced pressure heads in the Jurassic water-pressure complex of the Bukhara–Khiva region, the north-eastern part of the Amu Darya syneclise, with the methods of Silin-Bekchurin and Hubbert, and calculates hydraulic gradients, filtration velocities and a coefficient of hindered water movement for pairs of areas.

In the Lower–Middle Jurassic, the highest heads, 2,322–2,747 m, are in the east of the Beshkent trough around North Nishan, Girsan, Chilkuvar and Alan, and the lowest, 199–343 m, around Karim, Rasylkuduk, Jarkak, West Karaiz, Sarytash, Khodji, Khatar and Kumli. Heads drop from Alan (2,747 m) to North Urtabulak and Pamuk (709 and 431 m), which the authors read as an elision (compaction-driven) water-pressure system. Mean permeability and porosity in the Beshkent trough are 0.0001 darcy and 4%.

In both the Lower–Middle and Upper Jurassic, formation water flows from the south and south-east to the north and north-west. In the Jurassic of the Beshkent trough, 16 of 42 pressure measurements show abnormally high pressure, with anomaly coefficients above 1.20, mostly under thick Upper Jurassic salt; the authors suggest that Jurassic fluids rise into the Cretaceous near Buzakhur and North Guzar.

Figures (1)

Map of the long north-west-trending Bukhara–Khiva region with blue head contours and flow arrows, field names with head values, purple hatched pressure minima in the north and green hatched minima in the south — Fig. 2. Schematic map of reduced pressure heads of the Lower–Middle Jurassic deposits of the Bukhara–Khiva oil and gas region. 1–2 – outcrops of Palaeozoic and Jurassic rocks; 3 – deep faults; 4 – boundaries of tectonic elements; 5–7 – oil, oil-gas and gas fields; 8 – area name with reduced head, m; 9 – head contours, m; 10 – direction of groundwater flow; 11 – hydrodynamic parameters (porosity, hydraulic gradient, filtration velocity, coefficient of hindered water movement); 12–13 – pressure minima with closed and open contours. Source: T. Kh. Shoimurotov, K. B. Yusupov and S. T. Rakhmanova (2024), Shoimurotov et al. (2024), Fig. 2.

How to cite

T. Kh. Shoimurotov, K. B. Yusupov and S. T. Rakhmanova (2024). Forecast of the oil and gas prospects of the Jurassic deposits of the Bukhara-Khiva region by the hydrodynamic method. Geologiya fanlari universiteti xabarlari (Bulletin of the University of Geological Sciences), No. 2, 2024, pp. 5–18. https://files.uzgeouniver.uz/media/files/%D0%92%D0%B5%D1%81%D1%82%D0%BD%D0%B8%D0%BA_2_2024.pdf