Special Features of Geological Modeling of Shelf Sediments by the Example of East-Urengoy and North-Esetinsk Fields

The work objective of research is improving the quality of the reservoir modeling of the shelf deposits in the Neocomian clinoform complex by means of identification the peculiarities of geologic structure of the layers, and using of them for create the geological models oil and gas reservoirs. The subject of research is BU_16-18 layers in East-Urengoy and North-Esetinsk field. The main peculiarities of BU layers are lenticular body, the vertical and the lateral anisotropy of reservoir properties in the reservoir volume, the presence of transition water-oil zone in consequence of layer`s heterogeneous.

For identification and reservoir modeling of the peculiarities of geologic structure the shelf`s genesis layers used the results of seismic attribute analysis, fractional and mineral analysis of the rocks, conceptional model analysis about accumulation shelf sediments.

The result of the research are detecting all the peculiarities of geologic structure the shelf`s genesis layers such as lenticular body, the anisotropy of reservoir properties, the presence of transition water-oil zone. All peculiarities was introduced for create the geological models: structural framework building, expansion of the reservoir properties in the interwell space, saturation modeling taking into account transition water-oil zone parameters.