Breakthrough of shallow shale gas exploration in Taiyang anticline area and its significance for resource development in Zhaotong, Yunnan Province, China

LIANG Xing,XU Zhengyu,ZHANG Zhao,WANG Weixu,ZHANG Jiehui,LU Huili,ZHANG Lei,ZOU Chen,WANG Gaocheng,MEI Jue,RUI Yun

Table 4 PetroChina’s quality evaluation criterion for shale gas reservoir of Wufeng Fm. and Longmaxi Fm. in the Southern Sichuan Basin[42].

Parameter TOC/% Total porosity/% Total gas content/(m3•t-1) Brittleness index Type I ≥3 ≥4 ≥3 ≥55 Type II 2-3 3-4 2-3 35-55 Type III 1-2 2-3 1-2 ≤35