Distribution and exploration direction of medium- and large-sized marine carbonate gas fields in Sichuan Basin, SW China

Xinhua MA,Yu YANG,Long WEN,Bing LUO

Table 2 Statistics on basic characteristics of medium- and large-sized marine carbonate gas fields in Sichuan Basin.

Strata Basic characteristics of medium- and large-sized gas fields Main lithology Type of reservoir space Type of trap Total reserve in series of strata/ 108 m3 Large and extra-large gas fields Medium-sized gas field Proportion of medium- and large-sized gas reserves/% Quantity Reserve of single gas field/ 108 m3 Total reserves/ 108 m3 Typical gas field Quantity Reserves of single gas field/ 108 m3 Total reserves/ 108 m3 Typical gas field Leikoupo Formation Dolomite Pore Structural 459 2 86-350 436 Moxi and Zhongba 95.0 Jialingjiang Formation Dolomite Pore Structural 1 207 8 27-327 802 Moxi, Maliuchang and Dongxi 66.4 Feixianguan Formation Dolomite Pore Structural and structural- lithologic 6 392 4 359- 4 121 5 574 Puguang, Dukouhe, Luojiazhai and Tieshanpo 4 35-337 742 Longgang, Qilibei and Tieshan 98.8 Upper Permian Dolomite Pore Lithologic 3 086 1 2 195 2 195 Yuanba 7 47-384 781 Longgang and Yunanchang 96.0 Middle Permian Limestone Fracture- cave and cave Structural fracture- cave 881 10 32-68 471 54.0 Carboniferous Dolomite Pore Structural and structural- stratigraphic 2 511 1 1 021 1 021 Datianchi 13 37-236 1 330 Dachigan, Qilixia and Wolonghe 93.0 Cambrian Dolomite Pore and cave Structural- lithologic 4 415 1 4 404 4 404 Anyue 99.7 Sinian Dolomite Cave Structural- stratigraphic and structural 4 484 1 4 084 4 084 Anyue 1 400 400 Weiyuan 100.0