Naturally propped fractures caused by quartz cementation preserve oil reservoirs in basement rocks

Mas'ud Baba, John Parnell (Corresponding Author), Stephen A Bowden

Research output: Contribution to journalArticle


Much silica precipitation in oil reservoirs occurred in the presence of hydrocarbons, evidenced by the entrapment of oil fluid inclusions in quartz. Also, silica in sedimentary basins is commonly precipitated at oil-window temperatures. This spatial and temporal relationship between oil and quartz precipitation aids the entry of oil into fractured reservoirs, including fractured basement. Where quartz is precipitated as fracture linings, the fractures are propped open by bridging quartz crystals, creating high fracture porosity and permeability. Evidence from fossil fractured reservoirs shows a large proportion of oil residue is in such propped open fractures.
Original languageEnglish
Pages (from-to)343-347
Number of pages5
JournalTerra Nova
Issue number4
Early online date18 Mar 2019
Publication statusPublished - Aug 2019


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