| With the improvement of exploration technology,it has been made many important achievements in deep petroleum exploration.At the same time,marine carbonate is always the significant field.The discovered original proved plus probable(2P)reserves of deep marine carbonates amount to 68.6×10~8 toe(ton oil equivalent),including oil 30.0×10~8 t,gas 4.2×10~122 m~3 and condensate 4.9×10~8 t.Based on the newest data of deep oil/gas fields and guilded by the theory of basin analysis and petroleum geology,the distribution pattern of discovered oil and gas reserves is characterized with the ArcGIS software and a systematic comparison study of the essential elements for hydrocarbon accumulation in deep reservoirs in Chinese and foreign basins is conducted.The study indicates that petroleum is rich in Tethys and Boreal realms.Passive margin basins host 51.8%of the total reserves,followed by foreland basins with 46.0%of the total.In terms of oil and gas contribution,the most important source rock intervals are the Cambrian,Silurian,Jurassic and Cretaceous.The source rocks are dominated by mudstones,shales and argelaceous carbonates.Oil and gas are mainly distributed in Ordovician,Permian,Jurassic and Cretaceous reservoirs,which are dominated by dolomite and karsting carbonates.The main seals are confined to the Jurassic,Cretaceous,Triassic and Carboniferous.The shale is the main type,followed by carbonate.The evaporite seal is less common and it is mainly developed in the Triassic in the Sichuan Basin and the Precambrian in the Oman Basin.Compared with foreign countries,oil and gas resources are mainly distributed in the Precambrian to Paleozoic successions in China where the reservoirs are of old age and deeply buried.High-quality dolomite and karsting carbonate reservoirs have an important impact on the formation of large and medium-sized oil and gas fields. |
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