science

Marmousi model

Marmousi model is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Marmousi model rather than just read about it. In short: The Marmousi model (mar moo’ sē) is a complex 2D structural model and its seismic response devised by the Institut Français du Petrole, with strong horizontal and vertical velocity changes. Since its inception in 1988, Marmousi has become a standard to compare depth-migration and velocity determination models and to this day remains one of the most published geophysical data sets.

Key takeaways

Marmousi model belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Marmousi model to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Marmousi model from memory before moving on to harder problems.

Reference excerpt

The Marmousi model (mar moo’ sē) is a complex 2D structural model and its seismic response devised by the Institut Français du Petrole, with strong horizontal and vertical velocity changes. Since its inception in 1988, Marmousi has become a standard to compare depth-migration and velocity determination models and to this day remains one of the most published geophysical data sets.

Model Generation Based on a section in the Cuanza Basin a geometric model with 160 layers was generated using the MIMIC™ module of the SIERRA package. Realistic velocity and density distributions were defined by incorporating horizontal and vertical velocity gradients. The velocity gradient is higher in the shallower detrital series to represent strong compaction. The resulting model was transformed into a 2D velocity/density grid with dimensions of 9200 meters by 3000 meters and a grid size of 4 meters.

Geology The Marmousi model is created based on a profile through the North Quenguela in the Cuanza Basin (Angola). The mode includes a deltaic sediment interval deposited on a saliferous evaporitic series. The sediment thickens from west to east, with the eastern part exhibiting normal growth faults due to continuous lateral salt creep. The basin also contains presaliferous folded carbonate platform deposits, which are potential sites for structural hydrocarbon traps.

History The geological history of the basin can be divided into two distinct phases. The first phase involves continuous platform sedimentation, followed by slight folding and erosion of the deposited marls and carbonates. The second phase begins with the deposition of an isopachous saliferous evaporitic series, followed by the accumulation of clayey-marly sediments rich in organic matter. The subsequent deposition consists of thick shaly-sandy detrital sediments influenced by continuous lateral salt creep, resulting in slanting growth faults. These growth faults remain active throughout the deposition of the detrital series.

Petroleum Prospects In the detrital series, hydrocarbon traps are formed by structures associated with salt tectonics, such as residual salt cushion and inversion of depocenters caused by salt movement. The hydrocarbons in the sands originated from post-evaporitic source rock series and migrated upwards. The lower ante-saliferous series contains significant anticlinal structures, which were supplied with hydrocarbons from the overlying source rock series after the disappearance of salt due to lateral creep. The available data from three wells traverse an unfaulted sedimentary series without shaly-marly source rocks.

Marmousi2 In 2006 researchers from Houston (USA) updated the Marmousi model to fit the continuous advancements in computer hardware capabilities since the late 1980s, calling it Marmousi2. Based on the original Marmousi structure, the new model has been expanded in width and depth and was transformed into a fully elastic model, with high-frequency, high-fidelity, elastic, finite-difference synthetics. These simulations encompassed various shot records, including streamer, OBC, and VSP multicomponent data, with offsets of up to 15 km. Over time, the Marmousi2 model and dataset have proven to be valuable assets in various geophysical research applications, such as velocity analysis calibration, seismic migration, full-waveform inversion, AVO analysis, impedance inversion, multiple attenuation, and multicomponent imaging.

References

Illustrations

Worked examples

Example 1 — a first encounter with Marmousi model

Start with the simplest possible case. Write down what Marmousi model claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Marmousi model before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Marmousi model ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Marmousi model

In research: Marmousi model appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Marmousi model in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Marmousi model is common in secondary-school and first-year university syllabi. It links to neighbouring topics Seismology measurement, so understanding it makes those chapters shorter.
In everyday life: Look for Marmousi model outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Marmousi model in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Marmousi model means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Marmousi model out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Marmousi model in simple terms?

Why does Marmousi model matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Marmousi model?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Marmousi model.