DEPROIL - Your Partner in Complex Geological Settings

Examples

IDENTIFICATION DEEP-WATER FAN WITH 2.1 TCM OGIP WITHIN THE ULTRA-DEEPWATER AND CONTINENTAL SLOPE OF THE BLACK SEA


North-Western Part of the Black Sea, Ukraine, 2007
The deepwater fan with the most promising sweet spot area of
2,000 sq.km and the gross reserves estimation of 2.1 TCM OGIP (P50)
was mapped within the continental slope and ultra-deepwater. The major tectonic elements, such as deep mantle plumes, tectonic sutures and boundaries of sub-basins were delineated. Low-density anomalies, associated with known gas fields in Neogene, and new promising prospects in Paleogene and Cretaceous were mapped in 3D density model obtained by 3D gravity inversion.

IDENTIFYING OIL POOLS UNDER THE SALT WING


Academic Shpak oil field,
Dnieper-Donetsk Basin, Ukraine, 2012
The first exploration well was drilled in 2013 and discovered the new Akademic Shpak oil field, which proved an initial prediction of hydrocarbon presence near the southwestern wall and under the Runivshchyna salt dome. Hydrocarbon saturated reservoir was mapped in 2012 in 3D density model obtained by 3D gravity inversion.

A THREE-TIMES INCREASE OF THE GAS PROSPECT AREA AS A RESULT OF REFINING THE SHAPE OF BUDYSHCHANY SALT DOME


Dnieper-Donets Basin, Ukraine, 2012
The lateral size of Budyshchany salt dome was three times decreased compared to its initial size by 3D seismic data. The results of 3D gravity inversion showed that the new gas-bearing reservoir replaces the part of initial seismic salt dome, so the area of the hydrocarbon trap is three times larger than it had been expected before.

100% SUCCESS IN PREDICTION SUBSALT GAS RESERVOIRS CONFIRMED BY DECADES OF EXPLORATION DRILLING


Solotvyno and Dibrova gas fields,
Transcarpathian Trough, Ukraine, 2005
Two dry wells, drilled in 2005 and 2011, and one producing well, drilled in 2015, showed 100% confirmation of the 3D density model validity for gas-bearing heterogeneous terrigenous reservoir rocks overlain with salt. 3D density model, created in 2005 by applying 3D gravity inversion, was used to otline the contours of gas saturated reservoirs.

UNCONVENTIONAL OIL AND GAS RESERVOIRS WITHIN OBOLON ASTROBLEME


Southern Margin of Dnieper-Donets Depression,
Ukraine, 2011
Seven prospects have been mapped within the upper part of the crystalline basement, breccia complex and Jurassic basal sandstones of overlaying complex. The first priority prospect for exploration drilling is presented by a tectonically screened block within the crater rim in the South-Western part of the structure. Magnetic, geochemical, and thermometric data were used as indicators of integrity/tectonic fragmentation of predicted reservoirs and as indicators of areas with potential deposit destruction. New prospects were ranged by the value of predicted pore space volume within the entire geological section, as well as for each lithological / stratigraphical unit.

MAPPING PRESSURE DROP AND FLOODING AREAS BASED ON THE RESULTS OF TIME-LAPSE GRAVIMETRIC OBSERVATIONS AND BOREHOLE GRAVIMETRY (4D+1D)


Nadym-Pur, Western Siberia,
Russian Federation, 1998-2008
Waterflooding in well clusters of a large gas field has been stopped. The contour of an abnormally high rate pressure drop was mapped in the apical part of the gas-bearing structure, as well as the gas-water contact within the most permeable interlayers. Resumption of wells operating was based on the time-lapse on-land gravity measurements over the gas field in 1998 and 2008, borehole gravity measurements in 2008 and further joint 3D gravity inversion of all collected gravity data. For the first time, a 1 meter vertical resolution was chosen for 3D density model construction.

3D DYNAMIC MODELS OF THE RESERVOIR, FORMATION PRESSURE AND TECHNOGENIC RESERVOIRS BASED ON THE HIGH-PRECISION TIME-LAPSE GRAVIMETRIC OBSERVATIONS


Dashava underground gas storage (UGS),
Bilche-Volytsa zone of Pre-Carpathian Depression,
Ukraine, 2012-2013
The driving forces for cushion gas volume increase within Dashava underground gas storage have been specified. The location of peripheral technogenic reservoirs that accumulate cushion gas has been mapped. To stop the accumulation of gas in the periphery technogenic reservoirs, it was proposed to block gas channels from the core to the periphery reservoirs. The mapping was based on four sessions of gravity measurements in 2012 and 2013 using filling and depletion modes of the gas storage. A 4D model of the Dashava underground gas storage reservoir system was based on the results of 3D gravity.

SEARCHING FOR LOST GAS IN OLYSHIV UNDERGROUND STORAGE BASED ON THE HIGH-PRECISION GRAVIMETRIC OBSERVATIONS


Olyshivka underground gas storage (UGS),
The northwestern part of the Dnieper-Donets Depression,
Ukraine, 2017.
Two new separate artificial gas reservoirs, filled with gas from the main reservoir, have been mapped within Olyshivka underground gas storage. 3D model of current reservoir gas saturation was created and the gas volume of mapped reservoirs was calculated. To optimize the production of remaining cushion gas, it was reccomended to workover one exploration well and to drill three new exploration wells.

Joint inversion of seismic and gravity data for salt-bearing sediments


- mapping the structures below salt-bearing sediments
- predicting the shape of salt body based on seismic and gravity data.

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