Ranking of geological factors controlling the well productivity in Rotliegende gas fields of the Dutch offshore area

Conference · Wed Sep 01 04:00:00 EDT 1993 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:6963460

Walzebuck, J ^[1]

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1. Nederlandse Aardolie Maatschappij, Velsen (Netherlands)

Deeply buried Rotliegende sandstones deposited in the desert environment of the Southern Permian Basin form a primary target for hydrocarbon exploration and production in northwest Europe. In the Dutch offshore sector, some highly profitable Rotliegende fields are known. However, the success rate for exploration and field development is adversely affected by the variable Rotliegende reservoir quality, with tight gas sands and productive reservoirs units adjoining each other within fields. To improve the accuracy of reservoir performance forecasts, several case histories were analyzed and the observed well productivities correlated with key mineralogical and sedimentological parameters. The overriding influence of facies is evident: the textural characteristics of the Rotliegende sand determined not only the initial porosity after deposition, but influenced also the response of the rock to burial diagenesis. The mature, better sorted sandstone facies suffered least from diagenesis, whereas the immature lithologies lost much of their porosity and permeability by pervasive diagenetic cementation and clay mineral growth. The relative influence of burial/temperature history and mineralogical and sedimentological factors on well productivity was evaluated with multivariate statistics. Three field studies from the Dutch offshore area demonstrated that the well productivity can be modeled as a function of a limited number of geological factors. Testing the statistical formula with additional wells showed that the multivariate method improves the accuracy of reservoir quality predictions.

• OSTI ID: 6963460
• Report Number(s): CONF-9310237--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Journal Volume: 77:9
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
030200* -- Natural Gas-- Reserves
Geology
& Exploration
DEPOSITION
DEVELOPED COUNTRIES
DIAGENESIS
EUROPE
EXPLORATION
GEOLOGIC DEPOSITS
GEOLOGIC STRUCTURES
HYDROCARBONS
MATHEMATICS
MINERAL RESOURCES
MULTIVARIATE ANALYSIS
NATURAL GAS DEPOSITS
NATURAL GAS FIELDS
NATURAL GAS WELLS
NETHERLANDS
ORGANIC COMPOUNDS
PALEOTEMPERATURE
PERMEABILITY
PERMIAN BASIN
PHYSICAL PROPERTIES
POROSITY
PRODUCTIVITY
RESERVOIR ROCK
RESOURCES
ROCKS
SANDSTONES
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
SEDIMENTATION
STATISTICS
TEXTURE
WELLS
WESTERN EUROPE