FORWARD MODELLING A Blueback Rock Physics Workflow in Petrel*

By Shila Jeshani

INTRODUCTION

ADVANTAGES:

STEP 1: GASSMANN FLUID SUBSTITUTION

STEP 2: ROCK PHYSICS MODELLING AND LITHOLOGY SUBSTITUTION

STEP 3: SYNTHETICS

Fluid

Substitution

1 3 2 Create &

Parameterise RPMs Synthetics

The forward modelling workflow allows variations in

seismic amplitude based on changes in pore fluids and

lithology to be modelled. The Blueback Rock Physics plug-

in provides an automated implementation of the forward

modelling workflow. This allows investigation of parameter

sensitivity in the Petrel Workflow Editor. Lithology

Substitution

Investigate variations due to changes in fluid content by creating mineral and fluid properties and defining gas and/or oil legs.

Rock Physics Modelling

Create, parameterise and

QC rock physics models

(RPMs). Choose from a

variety of industry standard

models.

Lithology

Substitution

Use RPMs to

investigate the

effects of changing

petrophysical

properties (volume

of shale, porosity,

pressure and

water saturation).

Create and QC

different synthetic

seismic data.

Single angle,

stacked or partial-

stack outputs can

be created.

Blueback Rock Physics works in multiple domains.

Run workflows on:

Wells: single or multiple well analysis

Model: 3D model properties from selected grid

Seismic: select 3D seismic volumes

Numeric: enter inputs and write results to message

log

Tools are all Petrel workflow enabled. *Mark of Schlumberger

Blueback Reservoir www.blueback-reservoir.com sales@blueback-reservoir.com | information@blueback-reservoir.com Blueback Support Portal: support.blueback-reservoir.com

Property Prediction Apply Bayesian theory to find probable locations

of hydrocarbons and reservoir intervals

Fluid Substitution

Litho-facies Classification

Property Distribution Functions

Bayesian Classification

Tuning Effect Investigation Model the effects of your reservoir interval

pinching out by creating a tuning wedge

Litho-facies Classification

Blocky Modelling 1D

Tuning Wedge 2D/3D

Property Model Validation Create synthetic volumes to validate reservoir

model

Create and Parameterise Rock Physics Models

Generate Elastic Properties (in 3D model)

Impedances

Synthetics

Representative workflow:

Vary hydrocarbon saturations and petrophysical parameters within selected rock physics models to

observe changes in synthetics at the click of a button

Lithology substitution step: vary deltas

of water saturation, porosity and

pressure in iterative loops