Table C.62 Summary of shale and tight gas plays. Formation Age Environment Top Thickness Source rocks(s) Source Source Play type Exploration status depth (m) rock TOC rock maturity (%) (m) (Rv) Eumeralla Early Type II/III to Type III; 0.1–67.5 1,500 ~2,000 Tight gas Preliminary exploration Formation Cretaceous coal, DOM (Austral (includes gas; 2) coal); 0.2–2.5% average 5.73 Crayfish Early 1,700 3,500+ Type II/III to Type III; 0.37–2.6 Shale/tight gas Preliminary exploration Subgroup Cretaceous coal, DOM (Austral gas; 2) 0.3–1.8% Casterton Late Lacustrine 2,500 45-500 Type II/III (Austral 1) 0.4–9 Shale gas Preliminary exploration Formation gas; 0.4–2.0% Cretaceous
Table C.62 Summary of shale and tight gas plays. Formation Age Environment Top depth (m) Thickness (m) Source rocks(s) Source rock TOC (%) Source rock maturity (Rv) Play type Exploration status Eumeralla Formation Early Cretaceous 1,500 ~2,000 Type II/III to Type III; coal, DOM (Austral 2) 0.1–67.5 (includes coal); average 5.73 gas; 0.2–2.5% Tight gas Preliminary exploration Crayfish Subgroup Early Cretaceous 1,700 3,500+ Type II/III to Type III; coal, DOM (Austral 2) 0.37–2.6 gas; 0.3–1.8% Shale/tight gas Preliminary exploration Casterton Formation Late Cretaceous Lacustrine 2,500 45-500 Type II/III (Austral 1) 0.4–9 gas; 0.4–2.0% Shale gas Preliminary exploration