Распознавание разломной природы сланцевых залежей с использованием сейсмических атрибутов

Successful development of unconventional shale gas plays in North America can help with similar development in Europe, where traditional oil and gas resources studied extensively for decades. Optimizing the development of unconventional plays is difficult due to extremely low permeability, abnormal pressure and sonic velocity changes in layers. To ensure sufficient production rates and to maintain economic feasibility hydraulic fracturing should be modeled precisely within production zone to provide maximum areal contact with reservoir. While designing treatment parameters for fracing wells and given the high variability and heterogeneity of shale it’s imperative to delineate different zones (ductile and brittle) within shale. To solve such problem in highly faulted and fractured areas geoscientists traditionally used geometric post-stack seismic attributes (e.g., coherency or curvature) as they are the best for that purpose – detecting and delineating faults, fractures or any discontinuities. In our investigation we went further and studied geophysical responses of shale gas plays using pre-stack gathers and computed AVO attributes. Here we wanted to share the results of successful use of both – post-stack and pre-stack attributes for detection and delineation of different zones in shale plays and determination of gas distribution in shale plays at tuning thickness