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CLUES OF A SEDIMENTOLOGICAL MODEL FOR SOME OOLITE RESERVOIRS
(EXAMPLE OF THE VILLEPERDUE OIL FIELD, PARIS BASIN)
B. GRANIE...
The Villeperdue oil field is located 100km east of Paris. Based on well log data, two
main reservoirs, R1 (upper) and R2 (...
Field analogues of the same stratigraphic interval are found in Burgundy, near Dijon:
several quarries have been investiga...
Back to the Villeperdue field, such observations do not seem to give rise to a suitable
correlation model as we do not hav...
At first sight, the changes from radial to concentric and from concentric to micritic
textures seem to be rather progressi...
More accurate studies have shown that changes from one ooid texture to another are
not so gradual: there are at least two ...
In conclusion, the “Dalle Nacrée” Fm can be subdivided at least into three
parasequences (from base to top: radial ooid un...
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)
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Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)

Presented on March 17, 1993, on the occasion of the Petroleum Group's meeting: "Carbonate petroleum reservoirs: Models for exploration and development"

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Clues of a sedimentological model for some oolite reservoirs (example of the Villeperdue oil field, Paris basin)

  1. 1. CLUES OF A SEDIMENTOLOGICAL MODEL FOR SOME OOLITE RESERVOIRS (EXAMPLE OF THE VILLEPERDUE OIL FIELD, PARIS BASIN) B. GRANIER Total-C.F.P., Exploration Production, Saint- Rémy-Lès-Chevreuse, France 1993
  2. 2. The Villeperdue oil field is located 100km east of Paris. Based on well log data, two main reservoirs, R1 (upper) and R2 (lower), were first identified in the Lower Callovian oolite limestone, “Dalle Nacrée” Formation or “Petite Oolithe”, Several internal heterogeneities were then revealed by well logs (GR-FDC-CNL) in this up to 30m thick formation. As a result detailed core studies were undertaken. Most of them match with sedimentary discontinuities, either hard-grounds or gravel and pebble layers (one major discontinuity coincides with the top of the “Dalle Nacrée” Formation, another is located within the tight zone between R1 and R2). In addition, core slabs show evidence of unidirectional oblique stratifications related to the common occurrence of bioclast, grapestone, or oncoid laminae within the ooid facies.
  3. 3. Field analogues of the same stratigraphic interval are found in Burgundy, near Dijon: several quarries have been investigated there. The oolite bodies consist of stacked large sand waves, about one meter thick; oblique stratifications are easier to identify due to weathering (in former distension joints). Such field studies have helped us to understand the geometric pattern of the oolite sand waves and particularly of their bounding (bottom and top) surfaces. Most of the latter do correspond to hard-grounds or to erosional surfaces associated with gravel and pebble lag-deposits which may pass laterally from one to the other; such discontinuities may also diverge, stack or even cut one another. Therefore, the number of discontinuities observed on vertical sections varies within the same quarry. However, a few of them can be traced through the whole Dijon area; these discontinuities bound large sets of sand waves. The remaining ones often bound individual sand waves; one should note that, as two superposed sand waves form at the same time (one climbing on the stoss side of the other), the superposition principle cannot be applied to such environmental settings. The regional discontinuities are related to allocyclic phenomena and interpreted as time lines while the others, “local” ones, are related to autocyclic phenomena.
  4. 4. Back to the Villeperdue field, such observations do not seem to give rise to a suitable correlation model as we do not have at first hand the means to distinguish between allocyclic and autocyclic discontinuities. Detailed petrographic analyses revealed changes of the ooid texture from base to top of the “Dalle Nacrée” Formation: radial ooids, concentric ooids and then micritic ooids.
  5. 5. At first sight, the changes from radial to concentric and from concentric to micritic textures seem to be rather progressive: this gradual process is marked within the ooid cortex by a thickness decrease of the radial layers and by an increase of the number of radial and micritic layers. The micritic layers correspond to breaks in the growth of the ooids, often marked by the occurrence of incrusting Foraminifera (Nubecularia reicheli,...): they do not appear in radial ooids, they are common in concentric ooids, and abundant in micritic ooids. In addition, with respect to ooid structures, hemiooids are common among the radial ooids, rare among the concentric ooids, and absent among the micritic ooids. All these points are interpreted as the sedimentary record of gradual changes of biological, physical, and chemical states of the environment. The lack of evidence of emersion (except at the top of the underlying Comblanchien muddy facies, i.e., the Upper Bathonian), the common occurrence of algae in the underlying Comblanchien facies (the green Coniporella micromera) and at the lower part of the “Dalle Nacrée” Fm (the green Holosporella siamensis and the red Permocalculus spp.), their absence in the middle and upper parts of this formation (and the Middle-Upper Callovian Ammonite marls) - plus additional micropalaeontological and sedimentological data - suggest that these environmental changes are related to a continuous relative sea-level rise.
  6. 6. More accurate studies have shown that changes from one ooid texture to another are not so gradual: there are at least two main breaks within the sedimentary record (which lead us to define three units); each of these breaks coincides with a discontinuity corresponding to and/or followed by a gap or a condensed interval. Such discontinuities are therefore considered as time lines and can be correlated through the whole Villeperdue field and in the neighboring wells.
  7. 7. In conclusion, the “Dalle Nacrée” Fm can be subdivided at least into three parasequences (from base to top: radial ooid unit, concentric ooid unit and micritic ooid unit); it is stressed that our correlative lines cross-cut locally some of reservoir layers based on well logs (this early reservoir layering is therefore inconsistent with geological data) and that the two main reservoir units can be divided into subunits which are hard to correlate.

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  • wwlittle

    Feb. 21, 2018
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    Feb. 28, 2018

Presented on March 17, 1993, on the occasion of the Petroleum Group's meeting: "Carbonate petroleum reservoirs: Models for exploration and development"

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