Geofluids / 2020 / Article / Tab 2 / Research Article
Fracture, Dissolution, and Cementation Events in Ordovician Carbonate Reservoirs, Tarim Basin, NW China Table 2 Summary of geochemical and microthermometric characteristics of the main diagenetic features and cements shown in chronological order (paragenetic sequence). KB: matrix karstic breccia; F: fracture; V: dissolution vug; S: stylolite; Cc: calcite cement; Cs: calcite sediment; Dc: dolomite cement.
Feature Cement δ 18 O (VPDB)δ 13 C (VPDB)87 Sr/86 SrTh (o C) Salinity (wt.% eq. NaCl) Oil inclusions T oil (o C) Host rock − -7.4 to -5.5 -0.1 to 1.1 0.7088 − − No − -7.7 to -4.7 -0.3 to 1.6 0.7088 to 0.7089 − − No − -6.7 to -5.9 -0.6 to 1.7 0.7089 to 0.7090 − − No − -8.7 to -4.3 -0.6 to 3.2 0.70856 − − No − Host rock cementation Cc0a − − − − − No − Cc0b − − − 74 to 150 1.4 to 7.7 No − Cc0c − − − 75 to 131 1.6 to 5.6 No − Dark mottles Cs0a -9.1 to -6.3 -0.5 to 1.1 0.7091 − − No − Cs0b − − − − − No − F1 Cc1 -7.8 to -3.6 0.3 to 2.1 0.7087 76.9 to 113.9 1.9 to 2.7 No − Cs1 − − − − − No − Karstic breccias KB − − 0.7099 − − No − V2 Cc2 -9.1 to -4.5 -3.8 to 2.2 − 74 to 135 2.4 to 5.7 No − F2a F2b S1a & S1b − − − − − − − − F3a Cc3a -11.7 to -7.1 -0.2 to 2.8 0.7085 to 0.7088 60 to 165 0.4 to 12.3 Yellow to dull blue 60 to 75 F3b V3 Cc3b -12.8 to -9.3 1 to 2 0.7085 50 to 100 7.7 to 14.1 − − F4a Cc4 -15.8 to -13.7 -0.4 to 1.7 0.7094 to 0.7102 80 to 96 13.5 Bright blue to green-blue − F4b V4 F5 Fluorite − − − 79 to 112 9.6 to 10.5 Yellow-green to green − Barite − − − 117 to 144 11.1 to 19 − − Cc5 -13.7 to -9.7 -2.4 to -2.2 0.7090 61 to 97.8 5.7 to 14.7 − − Recrystallized host rock -11.1 to -6.4 -1.8 to -0.1 − − − − − F6 Cc6 -15.4 to -8.5 -4.8 to -0.2 0.7093 to 0.7094 95 to 123 4.7 to 10.5 − − V6 F7a Cc7a − − − − − Dull blue 44 to 58 F7b Cc7b -18.3 -1.1 − − − Light blue − V7 F7c & S2 Dc1 − − − − − − −