在黏土矿物转化的化学动力学模型中,大多数模型只考虑了温度、时间和流体介质的影响.然而,最近的一些研究表明,超压抑制黏土矿物的转化.考虑到超压对黏土矿物转化的抑制作用,建立了超压背景下黏土矿物转化的化学动力学模型,并用最优化方法确定了超压抑制因子,从而使伊/蒙混层中蒙皂石层质量分数模拟值与实测值的误差达到最小.为检验其合理性,将该模型分别应用于一个新生代盆地和一个中生代盆地.模拟结果表明:在超压地层中伊/蒙混层中蒙皂石层质量分数的模拟值与实测值吻合较好,在压力系数为1.2～1.7的地层中,超压对伊/蒙混层中蒙皂石层质量分数的抑制可达15％～20％.%Temperature, time and fluid-composition are currently the most frequently used controls in modeling the transformation of clay minerals. However,the latest studies suggest that overpressure can retard the clay mineral transformation. Taking overpressure's retardation on clay mineral transformation into consideration, a new optimum model has been developed, in which the overpressure inhibitory factor is calculated with the method of optimization, and the modeled error of 5 in I/S mixing layer is minimized. The model has been tested in a Meso-zoic basin and a Cenozoic basin, and the results show that the computed S in I/S is coincident with the measured data nicely,and S in I/S is retarded by 15% ~20% in the overpressure formation with the pressure coefficient of 1.2-1.7.
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