METHOD FOR POSITIONING WILDCAT, PROSPECT AND PRODUCTION WELLS AT OIL AND GAS FIELDS BY USING A THREE-DIMENSIONAL GEOLOGICAL MODEL

摘要

The invention can be used in oil geology, in particular for optimally locating new wells at the site to be investigated. The inventive method for positioning wildcat, prospect and production wells on oil and gas fields by using a three-dimensional geological model, consists in carrying out seismic exploration works, in drilling wells and simultaneously recovering a core from target formations, in carrying out geophysical examinations of wells, in testing said wells, in determining geological types of sections having different oil and gas production characteristics for the target formations by using the entirety of obtained seismic and borehole data items, in drawing forecast and seismic maps relating to the distribution of the determined types of sections on the investigated area, wherein the map of distribution of types of geological sections based on borehole and seismic investigations is converted into a number format which takes into account the fidelity parameters of forecasting technique, in developing, on the basis of the thus obtained map, the lithologic (lithofacies) model of a formation or a field, in developing, on the basis of the obtained lithofacies model, porosity models and oil and gas saturation of rocks, in evaluating, on the basis of the obtained geological model, the resource base of the field, in determining sites for possible sink of new (projected) wells and in locating new wells by means of a geologically, ecologically and economically optimal manner using the entire information available in the model. Said invention makes it possible to increase the efficiency of geological exploration works and to reduce the cost and time thereof by reducing the amount of drilling works and by increasing the performance thereof, to improve environmental friendliness by decreasing the negative influence on the environment, reducing drill footage and the amount of auxiliary engineering measures, such as communications and infrastructure.