Research Article
Diagenesis and Origination of Carbonate Cements in Deeply Buried Sandstones of the Eocene Es3 Member, Raoyang Sag, Bohai Bay Basin, China
Table 1
Modal composition by point counting (%) for 15 samples from the deeply buried Es3 sandstones.
| | Well no. | C22 | Cs1 | L101 | L425 | L446 | L496 | N52 | N63 | Ng5 | | Samples no. | C22-1 | C22-6 | Cs1-4 | Cs1-6 | L101-2 | L101-5 | L101-7 | L101-8 | L101-11 | L425-3 | L446-7 | L496-2 | N52-1 | N63-5 | Ng5-9 | | Depth (m) | 3855.9 | 4183.7 | 4297.22 | 4546.7 | 3619.0 | 3633.2 | 3644.1 | 3760.1 | 3786.6 | 3519.3 | 3593.4 | 3720.7 | 3536.4 | 3550.4 | 4756.9 | | S.d.m. face | B.c. | S.d.c. | S.d.c. | B.c. | B.c. | B.c. | B.c. | S.d.c. | S.d.c. | B.c. | S.d.c. | S.d.c. | B.c. | B.c. | B.c. |
| | Detrital grains | 59.2 | 62.5 | 56.9 | 64.3 | 61.6 | 63.4 | 56.3 | 67.0 | 59.7 | 62.3 | 61.3 | 55.6 | 58.9 | 43.9 | 53.5 | | Original quartz | 60.0 | 65.0 | 63.0 | 49.0 | 59.0 | 61.0 | 58.0 | 53.0 | 57.0 | 59.0 | 65.0 | 50.0 | 58.0 | 62.0 | 59.0 | | Present quartz | 58.0 | 63.0 | 62.0 | 54.0 | 58.0 | 60.0 | 55.0 | 52.0 | 62.0 | 56.0 | 64.0 | 49.0 | 48.0 | 55.0 | 58.0 | | Monocrystalline | 49.5 | 56.3 | 59.4 | 47.3 | 49.6 | 55.1 | 49.7 | 49.2 | 58.5 | 51.2 | 60.2 | 38.0 | 44.5 | 48.3 | 52.2 | | Polycrystalline | 8.5 | 6.7 | 2.6 | 6.7 | 8.4 | 4.9 | 5.3 | 2.8 | 3.5 | 4.8 | 3.8 | 11.0 | 3.5 | 6.7 | 5.8 | | Original feldspar | 32.0 | 25.0 | 28.0 | 40.0 | 32.0 | 29.0 | 25.0 | 35.0 | 30.0 | 27.0 | 29.0 | 38.0 | 25.0 | 26.0 | 26.0 | | Present feldspar | 27.0 | 20.0 | 23.0 | 36.0 | 33.0 | 28.0 | 20.0 | 34.0 | 26.0 | 15.0 | 26.0 | 39.0 | 17.0 | 17.0 | 12.0 | | Plagioclase | 19.5 | 15.8 | 19.3 | 29.1 | 22.0 | 23.8 | 17.4 | 28.1 | 23.7 | 10.5 | 20.2 | 31.5 | 12.3 | 13.9 | 10.0 | | K-feldspar | 7.5 | 4.2 | 3.7 | 6.9 | 11.0 | 4.2 | 2.6 | 5.9 | 2.3 | 4.5 | 5.8 | 7.5 | 4.7 | 3.1 | 2.0 | | Original R.f. | 8.0 | 10.0 | 9.0 | 11.0 | 9.0 | 10.0 | 16.0 | 12.0 | 13.0 | 14.0 | 6.0 | 12.0 | 17.0 | 12.0 | 15.0 | | Present R.f. | 15.0 | 17.0 | 15.0 | 10.0 | 9.0 | 12.0 | 25.0 | 14.0 | 12.0 | 29.0 | 10.0 | 12.0 | 35.0 | 28.0 | 30.0 | | Volcanic | 9.5 | 10.0 | 80 | 6.0 | 6.0 | 10.0 | 20.0 | 9.0 | 8.0 | 20.0 | 8.0 | 9.0 | 28.0 | 20.0 | 20.0 | | Metamorphic | 3.5 | 3.6 | 3.0 | 3.5 | 2.0 | 1.2 | 3.1 | 3.8 | 2.2 | 6.5 | 1.0 | 1.7 | 4.6 | 5.1 | 6.8 | | Sedimentary | 2.0 | 3.4 | 2.0 | 0.5 | 1.0 | 0.8 | 1.9 | 1.2 | 1.8 | 2.5 | 1.0 | 1.3 | 2.4 | 2.9 | 3.2 | | Mica | 1.5 | 1.0 | 1.5 | 2.0 | 1.5 | 1.5 | 2.5 | 0.5 | 3.0 | 5.0 | 1.5 | 0.5 | 1.0 | 2.5 | 1.5 | | Ooid and S.d. | 1.5 | 0.5 | 1.0 | 0.5 | 1.0 | 0.5 | 5.0 | 0.5 | 1.0 | 2.0 | 2.5 | 1.5 | 3.0 | 4.0 | 0.5 | | Matrix | 5.2 | 5.5 | 3.5 | 3.5 | 5.0 | 5.0 | 2.5 | 2.5 | 3.0 | 4.5 | 3.0 | 5.5 | 3.5 | 2.5 | 5.5 | | Au. minerals | 22.1 | 20.4 | 22.8 | 18.2 | 20.6 | 19.6 | 21.5 | 17.5 | 21.8 | 15.4 | 20.2 | 26.8 | 24.1 | 39.0 | 30.2 | | Ankerite | 8.9 | 7.5 | 6.0 | 6.6 | 6.0 | 6.8 | 7.0 | 5.5 | 9.5 | 5.4 | 6.7 | 11.9 | 7.8 | 2.3 | 11.3 | | Calcite | 4.2 | 3.9 | 2.5 | 2.7 | 3.9 | 3.7 | 3.5 | 4.5 | 5.0 | 2.5 | 3.5 | 5.5 | 3.4 | 29.2 | 6.3 | | N.f. dolomite | 2.8 | 1.5 | 2.2 | 1.5 | 2.5 | 2.8 | 2.0 | 1.5 | 2.0 | 2.0 | 1.5 | 2.7 | 2.1 | 1.5 | 2.5 | | Qog I | 3.2 | 3.0 | 4.7 | 3.2 | 3.5 | 2.3 | 3.5 | 2.5 | 2.0 | 2.5 | 3.0 | 3.0 | 3.0 | 2.5 | 3.0 | | Qog II | 1.5 | 2.1 | 3.2 | 1.2 | 2.5 | 2.0 | 1.5 | 1.5 | 1.0 | 1.0 | 1.0 | 1.0 | 2.0 | 1.5 | 1.5 | | Clay | 1.0 | 1.9 | 3.2 | 2.5 | 1.2 | 1.5 | 3.5 | 1.0 | 3.2 | 1.5 | 3.5 | 2.2 | 4.7 | 1.5 | 4.3 | | Pyrite | 0.5 | 0.5 | 1.0 | 0.5 | 1.0 | 0.5 | 0.5 | 0.5 | 0.1 | 0.5 | 1.0 | 0.5 | 1.1 | 0.5 | 1.3 | | Porosity | 10.5 | 10.1 | 14.3 | 11.5 | 10.3 | 10.0 | 12.2 | 12.0 | 11.5 | 10.8 | 11.5 | 10.1 | 9.5 | 8.1 | 9.3 |
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R.f.: rock fragment; S.d.: skeletal debris; Au.: authigenic; N.f.: nonferroan; S.d.m. face: sedimentary face; B.c.: brained channel; S.d.c.: subaqueous distributary channel.
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