Study of velocity characteristics of section based on data acquired by seismic technique of Parametric Deconvolution of Reflection

Abstract

The paper is devoted to more accurate design of velocity model of geological section on the basis of Parametric Deconvolution of Reflections (PRO) technique. CDP technique applied widely does not solve too many problems without resolution of which the petroleum industry in the country will definitely be behind the leading petroleum industries worldwide. The reason of such low economic indexes of geological survey consists in no improvement of resolution ability of CDP technique in Azerbaijan for over 30 years. One of the most complex and important tasks of seismic survey in areas with complicated setting in Azerbaijan consists in evaluation of velocity characteristics of geological environment which is crucial for development of adequate geological model. The paper gives the examples of practical use of PRO method applied to real seismic data from the worldwide practice. Results of PRO velocities calibration with the average velocities of vertical seismic profiling has been shown: the curves almost coincide. It has been noted that detailed development of velocity model by use of PRO allows to successfully resolve kinematic, as well as dynamic problem: velocity anomalies (low interval velocities) are stipulated by gas deposit presence. Results of PRO application in one of the areas of Absheron oil and gas region are displayed. Study of PRO velocities allowed to outline low velocity areas related to overpressure zones and possible presence of oil and gas reservoirs. Recently drilled well recovered oil and gas horizon in Miocene deposits.