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盆地压力仓的破裂不完全是天然水力压裂作用的结果．基于断裂力学和数值模拟认为，压力仓的破裂包括２种机制：仓内沉积物的天然水力压裂和封闭层的切向牵引张裂．当仓内沉积物天然水力压裂形成的裂缝抵达封闭层的底部时，产生切向强张应力使封闭层张裂．封闭层破裂后，流体将从仓内排出．在一个浅层压力仓中，裂缝张开及流体排出的时间在一个周期内约为１０～２０ａ．
The incomplete rupture of the pressure tank in the basin is the result of natural hydraulic fracturing. Based on the fracture mechanics and numerical simulation, it is considered that there are two kinds of mechanisms in the fracture of the pressure vessel: natural hydraulic fracturing of the sediment in the reservoir and tangential traction and cracking of the sealing layer. When cracks formed by natural hydraulic fracturing in the silo reach the bottom of the sealing layer, a tangential and strong tensile stress is generated to make the sealing layer crack. After the sealing layer ruptures, the fluid will be discharged from the bin. In a shallow pressure chamber, the time for the crack to open and fluid to discharge is about 10-20 a during one cycle.