DEPROIL LTD - Scientific and Technic Company

84% of well tests in 91 new boreholes proved commercial capacity of predicted gas-bearing reservoirs
STRONG MATH DRIVEN BY GEOLOGY = STATE OF THE ART IN 3D GRAVITY DATA INVERSION
Prediction of the most promising areas within oil and gas basins for licensing and exploration activities Prospects identification and their priority ranking within license area Location of reservoir distribution within proved deposits, saturation evaluation and optimization of appraisal and production drilling Prediction of porosity, gas saturation, bulk density of hydrocarbon resources per reservoir volume Mapping of artificial gas pools Mapping of production-induced changes within oil and gas reservoirs: pressure drop, gas saturation change, gas-water contact rise, localization of unswept zone Creating 4D dynamic model of underground gas storage in progress based on results of 4D gravimetric data acquisition and 4D gravity inversion	30+ years of research 20+ years of production experience 89+ successful E&P projects 91+ posterior wells checked 3D models 226+ well tests 84% of well tests confirmed 3D models 16% risk of drilling wet well and dry well 4 oil and gas field discoveries DENSITY AS FUNDAMENTAL ROCK PROPERTY

CRITICAL FACTORS FOR EXPLORATION & PRODUCTION SUCCESS, WHEN APPLYING GRAVITY DATA

3D joint inversion of gravity, seismic, well log, petrophysical and geological information is the only way to obtain meaningful information from gravimetric data.

Implication of additional geological and geophysical data into gravity inversion allows to impose geologically reasonable restrictions on the variations of parameters within the model (rock density, bedding depth) and to parametrize the inversion algorithm for obtaining a unique geologically meaningful 3D model out of the multiple possible solutions which correspond to the observed gravity.

Gravity inversion comprises 3D density model of the entire geological section - from the land surface to the crystalline basement or mantle (in case of regional exploration).

Using full Buguer gravity for inversion does not require to separate it into single components or extract gravity anomalies which correspond to studied geological structures. 3D gravity inversion provides compensation of obtain gravity by changing the entire 3D density model.

Using actual rock density allows to calculate 3D models of petrophysical parameters such as porosity, hydrocarbon (HC) saturation, hydrocarbons in-place per rock volume and predicted total amount of hydrocarbon resources and reserves.

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