序号

层系

砂组

孔隙压力梯度(g/cm³)

坍塌压力梯度(g/cm³)

破裂压力梯度(g/cm³)

1

上白垩

P₂C₁

0.842~1.034

0.897~1.262

1.714~2.234

2

P₂C₂

0.818~1.077

0.943~1.325

1.835~2.244

3

P₂C₃

0.970~1.156

0.816~1.351

1.831~2.241

4

P₂C₄

0.934~1.110

0.831~1.370

1.779~2.223

5

下白垩

P₁C₁

0.952~1.105

0.822~1.313

1.770~2.240

6

P₁C₂

0.942~1.117

0.774~1.292

1.812~2.129

7

P₁C₃

0.937~1.178

0.678~1.328

1.635~2.161