Geology of the oil and gas bearing Permian formation in the Polish Lowlands

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

OSTI ID:6964676

Pokorski, J; Wagner, R ^[1]

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1. Polish Geological Institut, Warsaw (Poland)

Permian rocks occur over more than 80% of the Polish territory and, in middle Poland, they occur at considerable depth, from 2 to 6 km. The Early Permian was a period of long-lasting intensive volcanic activity. The Late Permian and Zechstein began with desert deposition which was followed by evaporitic deposition of a shallow epicontinental sea. The middle Polish trough (MPT) constituted the central part of the late Permian basin and was the site of the earliest and longest deposition with the most intensive periodical subsidence not compensated by sedimentation. Subsidence rate and syndepositional faulting substantially controlled the paleogeographic pattern. The final structure of the oil and gas fields was caused by late diagenesis and Upper Cretaceous structural remodeling. The upper Rotliegendes have the biggest natural gas fields. Reservoir rocks are sandstone and sandstones interfingering with conglomerates in tectonically active zones. The most promising areas for hydrocarbon exploration are the marginal parts of the basin (UPL) and the contact zone between MPT and the adjacent platforms. In the central part of the basin, the most promising are sandstone complexes on elevated tectonic blocks. Zechstein hydrocarbon fields occur in carbonate horizons of the first three cycles (PZ1, PZ2, and PZ3). In some areas, the Zechstein limestones (Cal), constitute the natural gas reservoir. Main dolomite (Ca2), oil, gas, and condensate fields are connected with the carbonate platform or its slope. Source rocks for oil occur in the Ca2 basinal facies or in the deeper parts of the platform-type lagoons. Oil migration is short and lateral, from either the basin or lagoon, toward the carbonate platform. Gas in Ca2 derived from the sub-Zechstein basement and migrated vertically along fault zones. The most prospective areas are reservoir horizons of the carbonate platform occurring in the near source rocks. The play dolomite Ca3 is not very promising.

• OSTI ID: 6964676
• 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

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
CARBONATE MINERALS
CONGLOMERATES
DEPOSITION
DEVELOPING COUNTRIES
DIAGENESIS
DOLOMITE
EASTERN EUROPE
EUROPE
EXPLORATION
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGIC STRUCTURES
GEOLOGY
GROUND SUBSIDENCE
HYDROCARBONS
MIGRATION
MINERAL RESOURCES
MINERALS
MOUNTAINS
NATURAL GAS DEPOSITS
NATURAL GAS FIELDS
OIL FIELDS
ORGANIC COMPOUNDS
ORIGIN
PALEOZOIC ERA
PERMIAN PERIOD
PETROLEUM DEPOSITS
POLAND
PRECAMBRIAN ERA
RESERVOIR ROCK
RESOURCES
ROCKS
SANDSTONES
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
SEDIMENTATION