Studied the data of 327 wells in the Jialingjiang Formation and of 242 wells in the Yangxin Series

the specific value of well numbers of weak seismic reflection

abnormal reflections (with non-reflection) to that of strong reflection

and the specific value of success ratio to pore-fracture growth rate in the Jialingjiang Formation are 2.2 and 2.1 respectively

and these values of Yangxin Series are all 1. 6; as for the productivities of gas wells

the specific value of well numbers of weak seismic reflection plus abnormal reflections to that of strong reflection of high and medium sized productivities of the Jia lingjiang Formation is 1. 6

and that of Yangxin Series is 2. 3. This result is the reflection of pore and fracture development in subsurface rocks on seismic reflection records. The weak and abnormal reflection zones exist extensively not only in positive structures

but also in negative ones in Permian and Triassic

and even in old gas fields. So the exploration realm is still considerably vast.