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Diagenetic characteristics under abnormally low pressure: A case from the Paleogene of southern Western Sag, Liaohe Depression, Bohai Bay Basin
- Source :
- Petroleum Exploration and Development, Vol 43, Iss 4, Pp 731-736 (2016)
- Publication Year :
- 2016
- Publisher :
- KeAi Communications Co., Ltd., 2016.
-
Abstract
- The effects of low pressure and abnormally low pressure on reservoir diagenesis and physical property of the Paleocene in southern part of Western Sag of Liaohe Depression, Bohai Bay Basin have been analyzed using large amounts of pressure, physical property and formation testing data. When formation pressure is low or abnormally low, the pore fluid has lower pressure, the overburden litho-static pressure is largely born by the sandstone framework, sometimes over compaction occurs, leading to densification of reservoir and stronger mechanical compaction; residual formation pressure has a negative correlation with carbonate cement content, low pressure or abnormally low pressure tight sandstone formations have higher carbonate cement content than sandstone formations with hydrostatic pressure or weak overpressure; pore fluid in sandstones with low pressure or abnormally low pressure has higher Si4+, conducive to the siliceous cementation; when dissolution happens, reservoirs with low pressure or abnormally low pressure, poor in original physical properties, are not favorable for the injection of dissolution fluid and the expulsion of dissolution products, so they have weaker dissolution. In summary, reservoirs with low pressure or abnormally low pressure have poorer physical properties. Key words: abnormally low pressure, diagenesis, reservoir physical property, tight sandstone, Western Sag, Liaohe Depression
- Subjects :
- 020209 energy
Hydrostatic pressure
Compaction
Energy Engineering and Power Technology
02 engineering and technology
010502 geochemistry & geophysics
01 natural sciences
Physical property
chemistry.chemical_compound
Geochemistry and Petrology
0202 electrical engineering, electronic engineering, information engineering
Petrology
Geomorphology
Dissolution
lcsh:Petroleum refining. Petroleum products
0105 earth and related environmental sciences
Geology
Geotechnical Engineering and Engineering Geology
Cementation (geology)
Diagenesis
Overpressure
chemistry
lcsh:TP690-692.5
Carbonate
Economic Geology
Subjects
Details
- Language :
- English
- ISSN :
- 18763804
- Volume :
- 43
- Issue :
- 4
- Database :
- OpenAIRE
- Journal :
- Petroleum Exploration and Development
- Accession number :
- edsair.doi.dedup.....f2469cf103e34ec67d8dac344ebcf2a6