川西坳陷上三叠统至侏罗系地层主要表现为岩石致密、研磨性强，钻井速度慢，建井周期长。
From upper Triassic to Jurassic of west Sichuan Depression, the rock is dense, the grinding is strong, the speed of well drilling is slow and the cycle of building well is long.
川西坳陷上三叠统至侏罗系地层主要表现为岩石致密、研磨性强，钻井速度慢，建井周期长。
From upper Triassic to Jurassic of west Sichuan Depression, the rock is dense, the grinding is strong, the speed of well drilling is slow and the cycle of building well is long.
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