EUROPEAN ASSOCIATION OF 

PETROLEU M GEOSCIENTISTS 

& ENGINEERS 

4th Conference 

and 

Technical Exhibition 

Palais des Congres 

Paris, France 

1 - 5 June 1992 

Technical Programme and 

Abstracts of Papers 

(Oral and Poster Presentations) 



ORAL PRESENTATIONS 

HallF 

WEDNESDAY MORNING 3 JUNE ROOM 63 

Reservoir Characterization and Fluid Flow 
Chairman: H. Oronkert 

page 

09.00 Geological Modelling of Ancient Meander 64 
Belts as Potential Hydrocarbon Reservoir, 
Lorance Basin, Central Spain, 
Margarita Diaz-Molifla*, J. Arribas, 
J J. Gomez and A. Tortosa (F-!7) 

09.25 Three-Dimensional Heterogeneity Distributions 66 
from Outcrop Data, 
O. Dubrule*, A. Bernascolli, J.J. Mennillg and 
P. losep;' (F-18) 

09.50 A Product Model for Reservoir Cbaracled· 67 
zation, 
Tileo l.A. Kemme* alld L. Vasak (F-19) 

10.15 Databases for Geol ogical Reservoir 68 
Cbaracterization: An Integrated ApproadJ, 
H. Drollkert* alld M.E. DOlLSelaar (F-20) 

WAD Assessment of Connectivity in a Low 69 
Net-ta-Gros Turbidile Reservoir - A Case 
Study, 
A.l. Pearce*, S.PJ. Cossey and 1.K. Williams 
(F-21) 

11.05 Impact of Small Scale Geological Structure in 69 

11.30 

Waterflood Simulation; SLatistics and ScaJe.up 
Procedure, 
Pa/rick Corbell (F-22) 

History 
Dry-Gas 
Simulator, 

Matching 
Reservoir 

Uwe Lepper (F-23) 

a Naturally Fractured 
with a Dual-Porosjty 

70 

11.55 Early Location and Evaluation of Water Entries 71 
in Producing Wells, 
Michele Cigni, Umberto Gragnani and 
Alda Mul/oni' (F-24) 

• denotes speaker IX 



ORAL PRESENTATIONS 

GEOLOGICAL MODELLING OF ANCIENT MEANDER 
BELTS AS POTENTIAL HYDROCARBON RESERVOIRS, 
LORAN CA BASIN, CENTRAL SPAIN (F-17) 

M. Dial-Molina, J. Arribas, J.J. G6mel and A. Tor/oso 
Facultad de C. Geol6gicas (UCM), InsitulO de Gcologla Economica 
(CSIC), 28040 Madrid, Spain. 

Modelling of bydrocarbon reservoirs currently represents one 
of the most important challenges for the oil industry and is 
necessary to oplimize exploration and productjon tecbniques. 
The prediction of exlernal and inlemal geometry of the 
reservoirs as well as tbe distribution of porosity, permeability, 
fluid-flow barriers and pay intervals aTe especially critical in 
environments where the distribution and continuity of the sand 
bodies can be highly complex. Tbis is tbe case in meander 
stream systems, generators of potentially excellent quality 
reservohs which nevertheless frequenlly sbow a puzzling 3D 
distribution of tbe different parameters. On tbis basis, priority 
sbould be given to learning about tbese types of potential 
reservoirs from surface data, wbich are later extrapolated 10 
blind basins. 

Geologlcal modelling focused on reservoir description 
and on progressive mathematical modelling, is here based on 
detailed reconnaissance of continental deposits (Upper 
OJigocene-Lower Miocene) exposed in the Loranca Basin, 
central Spain. Tertiary deposits partially cover a thin-skin 
thrust belt of detached Mesozoic sedimentary rocks, as sbown 
in the interpretation of the regional seismic lines. The studied 
portion of meander-belt sedimenfs, a fragment. of the T6rtola 
Depositional System is located on the eastern limb of the 
Huete ramping anticline. Synsedimentary structural control is 
documented by meandering channels running parallel or 
subparallel to the south-north main structural trend. 

An 800 m long exposure covering a stratigrapbic 
interval of 115 m was selected to fonn a cross-sectional panel. 
Exposure geometry allowed partial 3D observation and 
detailed mapping of the sandstone bodies. Isolated or stacked 

sand facies were deposited as meander loops, chaIUlel fills and 
marginal overbank deposits. Recognized point-bar sequences 
show the presence of ripple composite bars througbout the 
sequence, differing from tbe classic model in which ripples 
are located in the upper parI. Conelaliolls were mainly based 
on continuous or partiaJJy continuous distinctive slratigrapbic 
levels such as lacustrine carbonates and palaeosols. 

Reconstruction of sandstone bodies in the cross-section 
was aided by interaction witb mapping of tbe flood plain 
elements integrating each of tbe aggradational units. 
Superposition of tbe mapped meander belts allowed a 3D 

64