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PSQuantifying Previous HitFaciesNext Hit Attributes of the Caicos Platform*

By

Paul M. (Mitch) Harris1 and Brigitte M. Vlaswinkel2

 

Search and Discovery Article #50079 (2008)

Posted August 1, 2008

 

*Adapted from poster presentation at AAPG Annual Convention, San Antonio, Texas, April 20, 2008. See companion articles, “Trend Metrics of Modern Previous HitCarbonateNext Hit Depositional Systems,” Search and Discovery Article #50081 (2008) and “Input for Previous HitCarbonateNext Hit Reservoir Models: Trend Metrics of Modern Platforms and Reef Systems,” Search and Discovery Article #50127 (2008).

Click to view list of articles adapted from presentations by P.M. (Mitch) Harris or by his co-workers and him at AAPG meetings from 2000 to 2008.

1Chevron Energy Technology Company, San Ramon, CA 94583 ([email protected])

2Shell International E&P, Rijswijk, 2288 GS, The Netherlands ([email protected])

 

Abstract 

Spatial heterogeneity is a basic characteristic of Previous HitcarbonateNext Hit depositional systems. Examining spatial depositional patterns and quantifying the Previous HitfaciesNext Hit attributes (e.g., size, shape, and Previous HitfaciesNext Hit interrelationships) in modern analogs can decrease uncertainty in a geologic model and therefore enhance the model’s utility. In an attempt to gather such valuable data, the attributes for key Previous HitfaciesNext Hit of the Caicos platform are assessed from a Landsat image through Previous HitfaciesNext Hit mapping. Reef-associated Previous HitfaciesNext Hit, including fully aggraded reef, partially aggraded reef, and apron are emphasized due to their importance in many isolated platform reservoirs.

 

Some key findings are:

1. Platform size and reef abundance are directly related, wherein reef (fully and partially aggraded) and reef apron occupy a smaller percentage of a large platform like Caicos.

2. Reefs seem to be patchier than aprons.

3. Fully aggraded reefs become somewhat wider as their length increases; partially aggraded reefs are discontinuous along their long axis so the relation to reef width is more subtle.

4. Reef width and apron width are directly related.

5. Probabilities can be set for expected dimensions for: reef width (10% probability that reef width > 410 m, 50% probability > 270 m, and 90% probability > 145 m); and apron width (10% probability that apron width > 945 m, 50% probability > 395 m, and 90% probability > 90m).

 

Modern analogs like Caicos can play an important role as conceptual Previous HitfaciesNext Hit models for characterization of a reservoir, and also in providing Previous HitfaciesNext Hit attribute information to be used as input in building reservoir models

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Selected Figures

Landsat image (left) and Previous HitfaciesNext Hit interpretation (right) of the Caicos platform.

Seismic profile (left) and depositional model (right) of Malampaya, which is an isolated Previous HitcarbonateNext Hit platform with a reef rim and an asymmetric Previous HitfaciesNext Hit distribution over the platform (from Grötsch and Mercadier, 1999).

Data grouped by size and shape.

Previous HitFaciesNext Hit.

Attribute data from reef Previous HitfaciesNext Hit, shown graphically.

A. Reef width vs. total length. Fully aggraded reefs generally become wider as their long axis increases, but the relation is more subtle for the more discontinuous, partially aggraded reefs (left).Fully aggraded reef, Caicos platform (center). Partially aggraded reef, Caicos platform (right).

B. Apron width vs. reef width, Caicos platform, which shows strong positive relation between width of the reef (reef is fully or partially aggraded) and the apron..

C. Exceedance probability plots from all platforms, with Caicos being the largest, show size attributes for reef width (left) and apron width (right).

  

Rationale 

  • An accurate Previous HitfaciesNext Hit model is essential for reservoir characterization and realistic reservoir modeling, as depositional Previous HitfaciesNext Hit can be a main parameter controlling heterogeneity in porosity and permeability.

  • Prediction of the quantitative attributes (size, shape, orientation, distribution, etc.) and variation of Previous HitfaciesNext Hit dimensions is fundamental for enhanced reservoir simulations for Previous HitcarbonateNext Hit systems.

 

Objectives 

  • Provide an overview of the spectrum of Previous HitfaciesNext Hit patterns present in modern isolated Previous HitcarbonateNext Hit systems.

  • Obtain quantitative data on Previous HitfaciesNext Hit dimensions, grouped by size and shape of Previous HitcarbonateNext Hit platform.

  • Explore correlations and trends on landscape and Previous HitfaciesNext Hit scale.

 

Previous HitFaciesTop 

1) Fully aggraded reef

2) Partially aggraded reef

3) Reef apron

4) Shoals

5) Shallow platform interior (w or w/o isolated reefs)

6) Intermediate platform interior (w or w/o reefs)

7) Deep platform interior (w or w/o reefs)

8) Forereef/outer platform

9) Land/exposed terrain

 

Reference 

Grötsch, Jürgen, and Christophe Mercadier, 1999, Integrated 3-D reservoir modeling based on 3-D seismic: The Tertiary Malampaya and Camago buildups, offshore Palawan, Philippines: AAPG Bulletin, v. 83, p. 1703-1728.

 

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