Petrel quantitative interpretation

Accurate and comprehensive quantitative interpretation

Overview

Petrel™ quantitative interpretation enables true integration of multidisciplinary seismic with well and geological data. This ensures complete description of reservoir properties and extends conventional qualitative interpretation to a quantitative interpretation workflow in the same canvas. Petrel quantitative interpretation is a product development collaboration between SLB and Ikon Science.

Without leaving the Petrel platform, Petrel quantitative interpretation provides seamless seismic data conditioning, rock physics, fluid substitution, AVO/AVA analysis, and pre- and poststack deterministic and stochastic inversion to predict lithology, pore fluid content, and seismic pore pressure modeling.

Product of normal incidence (NI) and Poisson’s ratio contrast (PRC) (Verm and Hilterman to aid the identification of fluids in the study area. We can clearly see the zone of AVO anomalies in the central part. Data courtesy of Geoscience Australia.

Extended elastic impedance process for fluid and lithology prediction. Using the EEI correlation plot you can perform an extensive scan of the Chi projection angle to find the best match with the target property, in this case porosity, while analyzing the correlation coefficient. Data courtesy of Geoscience Australia.

Results of elastic seismic inversion, showing an acoustic impedance volume and well data; with red indicating high acoustic impedance, and purple low acoustic impedance. Quality control plots for three different wells show the output acoustic impedance, VPVs and density logs with the inverted volume on each side. Data courtesy of Geoscience Australia.

After performing seismic inversion, the Petrel E&P software platform automatically creates inversion quality control plots which can be viewed in a well section window. Here we see the results of elastic seismic inversion; acoustic impedance, VpVs and density (going from left to right) with the inverted volume on each side. Data courtesy of Geoscience Australia.

Lithofacies prediction applied to an inverted AI and VpVs volume. On the left, showing sand bearing hydrocarbons in green against the original amplitude seismic and on the right, displayed as a horizon probe showing a high probability of hydrocarbon bearing sand in red, and low probability in blue/black. Inset: AI VpVs cross plot showing the facies classification for the interval of interest and a 3D lithoanalysis using a Bayesian probability fuction. Data courtesy of Geoscience Australia.

Applications

Rock physics modeling

Explore the comprehensive library of rock models for a wide range of geological settings and expand the library adding custom models. Automatically calibrate model parameters and simulate stochastic rock models to capture heterogeneity and uncertainty. Take advantage of 4d modeling, interacting with geomechanics and dynamic reservoir models.

Rock physics modeling is now included in Petrel quantitative interpretation.

Litho-elastic AVO inversion

Exploit single-loop inversion to elastic properties and lithofacies probability. For improved fracture characterization, experience Orthorhombic AVAZ (amplitude variation with azimuth) inversion; and obtain more accurate results and strong contrasts with non-linear inversion.

Litho-elastic AVO inversion is now included in Petrel quantitative interpretation.

Benefits

Petrel rock physics and Inversion plug-in provides a set of robust, interactive tools to explore the relationship between seismic amplitudes and reservoir properties in 3D and 4D. Leading-edge seismic AVO inversion techniques enable solving jointly for lithofacies and elastic properties. With petrophysical joint inversion, multiphysics measurement can be integrated for a better estimation of reservoir properties.

This functionality is now included as part of Petrel quantitative interpretation.

Features

Rock physics processes for estimating elastic parameters, such as acoustic impedance, Vp/Vs ratio, Poisson’s ratio, Young’s modulus, and a complete suite of fluid substitution tools based on Gassmann’s equation.
Seismic pore pressure prediction workflow, including rock physics model for pore pressure calibration at well locations
Easy to use wavelet equalization capabilities, correcting your seismic data to zero phase
AVO modeling processes for the generation of synthetic gathers based on Zoeppritz and other industry standard algorithms, considering both isotropic and anisotropic models
Seismic conditioning enabling seismic resampling and seismic trace alignment based on nonrigid matching Industry-leading colored, deterministic simultaneous stochastic inversion for prestack and poststack data
Interactive extended elastic impedance (EEI) capabilities using multiple chi angles to produce EEI volumes at seismic scale
Lithology classification workflow based on Bayesian estimation
Robust 2D and 3D crossplotting tool for seismic and well data to identity and isolate anomalous hydrocarbon zones
Intuitive 2D forward-modeling capabilities (wedge, anticline, dipping reservoir models and user-defined and seismic line methods) for generating a synthetic seismic response from rock properties
Time-lapse analysis capabilities for 4D workflows based on reservoir elastic modeling (REM)