Absolute BME: Quantitative Seismic Interpretation

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Esme Kong
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Hello, I'm Robin Westerman.

This is about a new version of Absolute BME's course on Quantitative Seismic Interpretation -- or QSI.

We are in Cadeby Quarry in Yorkshire with real rocks... QSI describes reservoir rocks from surface seismic, well data and geological knowledge.

This is the type locality for the Cadeby Formation. It has 16-18% intrinsic porosity and significant fracture permeability. There are source rocks below.

It's a reservoir interval in some petroleum reservoirs:
• Onshore UK
• Across the Southern and Central North Sea
• and into Holland and beyond

However, this is the Magnesian Limestone and QSI is most at home with sand-shale sequences. Carbonates are more of a challenge.

This flowchart groups the main Reservoir Description stages of seismic, drilling and engineering by colour. The overall flow is from left to right, data and processes mostly flow from top to bottom. The central QSI process of Rock Physics and Amplitude versus Offset (or AVO) analysis is in red.

Note the parallelism between:
• QSI -- narrowly defined in red, with Pre-stack seismic attributes and Rock Physics
and
• QSI -- broadly defined, to include Post-stack seismic attributes and Inversion in blue

In response to feedback requests, Absolute BME is broadening their QSI course:
We need both Pre- and Post-stack seismic. So we plan an icebreaker practical, to introduce basic seismic processing and gathers.

Then we'll discuss Pre-stack attributes on the 2nd day and Post-stack attributes on the last day

Seismic is a form of Remote Sensing. As with satellite images we Ground-truth to real features and materials.

In QSI, we calibrate seismic against non-seismic data. In order of rapidly increasing cost and relevance we have:

a. Outcrop analogues and lateral equivalents like this

b. Seismic waves average the detail we see in outcrops and well logs. Reflection coefficients measure changes in bulk rock properties.

c. Wells ground-truth Rock Physics with wireline logs and fluid samples. Broader QSI can use almost every well data type. Third-party experts provide Asset Teams with key insights.

d. Well Tests, Flowmeter logs and Production History have no azimuthal information, so now QSI explains. Critical reviews tune the Reservoir Model.

In summary:

Absolute BME's new QSI course will be broad & interactive. We'll have practical sessions with delegates' own laptop computers.

On Day 1, we'll review the Reservoir Description workflow. In the afternoon, we'll get familiar with seismic gathers and wiggles.

On Day 2, we'll discuss QSI with logs and Rock Physics. In the afternoon, we'll look at Pre-stack seismic attributes.

On Day 3, we'll discuss Post-stack seismic attributes. In the afternoon, we'll look at 3D and 4D seismic for Exploration and Reservoir Models.

Thank you for listening.