HIGH-RESOLUTION SEISMIC ACQUISITION AND PROCESSING OF 3D-1C AND 3D-3C DATA FOR SHALE GAS/OIL PLAYS IN MEXICO(PPT)

摘要

In most countries with petroleum production, it is well known that great economic relevance has been given to unconventional reservoirs, particularly to those coming from shale rocks. Mexico is no exception, and a very ambitious applied-research project was approved last year. The aim is to characterize and understand the seismic response of shale oil/gas reservoirs using several geophysical scales and establish the optimal scientific conditions of exploitation. The main activity of the project is devoted in the design, acquisition and processing of 3D-3C seismic data in two prospective areas in northern Mexico. The seismic acquisition program is based on the most recent technology applications that include: a) High density and full azimuth options, b) Improving the illumination of subsurface units and c) Developing the seismic data processing by the means of azimuthal images to achieve both, fracture detection and elastic inversion. The last activity, will allow the prediction of brittle and ductile zones in the sedimentary packages that are needed to identity sweet-spots. Seismic imaging is more important for well steering and hazard avoidance. Petrophysical and fracture density measurements, rock physics studies and VSP's available data will be more critical to establish the sweet-spot detection and the design of production wells and completion by hydraulic fractures. In this work, the calculation of optimal parameters for 3D-1C and 3D-3C seismic data acquisition is presented. The data processing flows to perform accurate interpretation of the obtained information leading to create high resolution images of target formations, are given. The most relevant cases of multi-scale calculations and quantitative interpretations of acoustic and elastic results are evinced. In order to reduce the uncertainty in the volumetric evaluation of prospective resources and seismically identify the opportunity areas with the highest hydrocarbon potential, results of the wave propagation analyses are illustrated.