Sedimentological control on the diagenesis and reservoir quality of tidal sandstones of the Upper Cape Hay Formation (Permian, Bonaparte Basin, Australia)
| Autor: | Maurice Pagel, Guy Desaubliaux, Agathe Bucherie, Jessica Saïag, Eric Portier, Serge Miska, Benjamin Brigaud |
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| Přispěvatelé: | Géosciences Paris Sud (GEOPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), ENGIE E&P International [La Défense], Funding from ENGIE (grant numbers N93420 and P04980). |
| Rok vydání: | 2016 |
| Předmět: |
Petrography
020209 energy Stratigraphy [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography Mineralogy Sandstone Permian 02 engineering and technology engineering.material 010502 geochemistry & geophysics Oceanography 01 natural sciences Diagenesis chemistry.chemical_compound Clay coating 0202 electrical engineering electronic engineering information engineering 14. Life underwater Quartz Chlorite Reservoir 0105 earth and related environmental sciences Calcite Geology Cementation (geology) Bonaparte Basin 6. Clean water Geophysics chemistry [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy Illite engineering Economic Geology Siliciclastic Dickite |
| Zdroj: | Marine and Petroleum Geology Marine and Petroleum Geology, Elsevier, 2016, 77, pp. 597-624. ⟨10.1016/j.marpetgeo.2016.07.002⟩ |
| ISSN: | 0264-8172 |
| DOI: | 10.1016/j.marpetgeo.2016.07.002 |
| Popis: | 28 pages; International audience; The deep siliciclastic reservoir (>3500 m) of the Upper Cape Hay Formation of the Bonaparte Basin (Petrel gas field, Petrel sub-basin, Permian) exhibits wide heterogeneity in porosity (2–26%) and permeability (0.001–2500 mD). To investigate this variability, 42 samples were taken from five wells drilled through this formation. Six facies were identified from core descriptions and microscopic study of the sandstones. These facies are typical of a tide-dominated estuary, and include (1) mud flat, (2) sand flat, (3) top of tidal sand bar, (4) middle of tidal sand bar, (5) bottom of tidal sand bar, and (6) outer estuary facies. The paragenetic sequence comprises the emplacement of early aggregates of ferrous clay mineral precursors, mechanical compaction, recrystallization of those ferrous clay mineral precursors to Fe-rich chlorite and crystallization of Fe-rich chlorite forming coatings around detrital grains, chemical compaction, development of quartz overgrowth, feldspar alteration, crystallization of dickite and illite-rich illite/smectite (I-S) mixed layers, and ferrous calcite cementation. The middle and top of the tidal bars generally exhibit the highest porosity (Φ > 10%) and permeability values (k > 1 mD). Feldspar alteration released silica and aluminium into the reservoir promoting the development of dickite and illite-rich I/S mixed layers, which tended to destroy porosity and permeability, as calcite cements and quartz overgrowths. Diagenetic chlorite coatings around detrital grains are restricted to the sand bar facies deposited at the end of the last third-order transgressive systems tract of the Cape Hay Formation. The formation and conservation of ferrous clay precursors seems to be possible in an estuarine environment where seawater and fresh water are mixed and tidal sand bars are formed. These ferrous clay precursors recrystallized to Fe-rich chlorite coating after mechanical compaction. These coatings inhibited quartz cementation and prove to be the key parameter behind good reservoir qualities. |
| Databáze: | OpenAIRE |
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