Identification of the key geological uncertainties by unconventional reservoirs features analysis

Prospects of the study field are linked with the reservoir engineering of low permeability formations of lower Jurassic - J15, J14. It is essential to have an accurate prediction of geological parameters for optimal reservoir engineering system for such unconventional reservoirs. The main problem at the study field is the lack of direct methods for the reservoirs definition (poor well logging), the uncertainty of quantitative interpretation, of the lateral variability, the inability to forecast the reservoir properties according to the current seismic data processing. Through the core, logs and seismic data complex study were set the wide area spreading of sediments as reservoirs and non-reservoirs. It can be noticed certain reduction of the J15 formation total thickness on the elevations. The paper contains the prerequisites for the formation reservoir properties and their differentiation in the geological section, lithogenetic factors associated with tectonic processes and the basic geological uncertainties.