DOI 10.21440/2307-2091-2017-1-27-31
Forecasting of hydrocarbon potential with a new approach to seismic inversion pdf
T. R. Akhmedov
The article is devoted to forecasting of hydrocarbon potential of the geological section using seismic inversion. The aim of our research is to develop a new approach to the seismic inversion, to determine the place of projected well location. The article briefly reviews existing in the world practice methods of seismic inversion, among which AVO data inversion method stands out. All these methods have one drawback – using the data of well logging (WL) in the final stage of processing, and scientists consider that the processed seismic data has optimum quality. Even if it has a good quality, it is evident that its resolution is much lower. We eliminated these drawbacks in our approach, and we used WL data in the processing of seismic data in order to improve the signal/noise ratio. Software package "AZERI" processes and interprets materials of seismic prospecting and WL, as well as provides seismic inversion. This article contains a brief description of the developed algorithms and programs based on it, which we named "AZERI". The developed method of seismic inversion was applied on one of the areas of the Apsheron
Peninsula of Azerbaijan. After showing the outline of studied area, we give the main results of the use of "AZERI". We divided studied cut to the upper part, including precipitation covering the Miocene sediments, and the lower part, covering zone of abnormally high pore pressure (AHPP), which includes Miocene deposits, for the upper part the areas where AR (apparent resistivity) is above 10 ohm-meters are high-resistant, and for the lower part these are the areas with AR higher than 2 ohm-meters (2). The obtained data leads to the conclusion that the most appropriate place for laying of the projected new well is the point of intersection of lines 132 and 368 of 3D seismic prospecting, since the interpretation of the seismic inversion data using PRIZMA package showed that the oil-bearing part of Kale suite at this point covers the depth interval of 4060–4115 m with total capacity of this interval being about 15 m. Under this interval, Miocene deposits also are oil-bearing.
Keywords: 3D seismic prospecting; seismic inversion; vertical seismic profiling (VSP); acoustic logging (AL); abnormally high pore pressure (AHPP); interpretation; Oligocene; Miocene; Kalinskaya suite.
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