Reconstruction and petroleum geological significance of lithofacies paleogeography and paleokarst geomorphology of the Middle Permian Maokou Formation in northwestern Sichuan Basin, SW China

ZHONG Yuan,YANG Yueming,WEN Long,LUO Bing,XIAO Di,LI Minglong,CHEN Cong,ZHAO Like,LU Feifan,TAN Xiucheng

Table 1 Relationships between paleokarst geomorphic units and sedimentary facies and tested production.

Well ID Horizon Paleokarst geomorphic unit Sedimentary facies Tested gas production/ (104 m3·d-1) Tested water production/ (m3·d-1) WJ1 L104 L004-X1 L4 L16 ST1 YB7 LSC1-LSC2 LSC2 LSC2 LSC2 LSC2 LSC3 Wujiaping Formation-LSC3 Dissolution monadnock Karst slope Karst slope Karst slope Karst slope Dissolution monadnock Dissolution monadnock Intra-platform high-energy shoal Slope Slope Slope Slope Platform-margin high-energy shoal Platform-margin high-energy shoal 2.28 118.33 20.97 251.47 126.77 105.94 24