In the central part of west Sichuan, the upper Triassic tight clastic strata is not only developed with many original pools, but also associated with secondary pools.

• 川西中部地区上三叠统碎屑岩中既发育有原生气藏也伴生有丰富的“次生气藏”,并以“次生气藏”埋深浅、气质好、经济效益高而引起人们的广泛重视。