«Geology, geophysics and development of oil and gas fields»

Results of core samples petrophysical study of the Siljan ring structure basement

UDC: 553.98(485):550.822.3+552.2
DOI: -

Authors:

¹ National University of Oil and Gas "Gubkin University", Moscow, Russia
² KTH Royal Institute of Technology, Stockholm, Sweden
³ PetroTrace LLC, Moscow, Russia

Keywords: Siljan crater, basement rocks, core study, rock petrotypes, fractures, voids

Annotation:

Many hydrocarbon deposits worldwide have been discovered and are being developed in ring structures, defined as meteorite craters. One of such well-known structures is the Siljan Crater in central Sweden. Wells drilled in the crater have produced gas inflows and revealed oil saturation in sedimentary cover rocks. This led to a comprehensive study of the core material to characterize the reservoir potential of the rocks and identify zones of potential hydrocarbon reservoirs. The three sections studied, located along the periphery of the Siljan Ring, were found to be composed of alternating igneous rocks of acidic and basic composition in the basement intervals. Sections are characterized by varying degrees of fracturing – the most disturbed sections are in the western part of the ring structure. The best porosity and permeability in these sections are found in cataclasites of acid volcanic rocks. Granitoids in the eastern area are characterized by less intense fracture development and less often have significant reservoir properties. Dolerite and gabbroid intervals can be classified as seals or intra-reservoir barriers.

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