A method for determining the sealing thickness of complex lithologic layers based on temperature-pressure field simulation

Abstract

The present invention discloses a method for determining the sealing thickness of a complex lithologic layer based on temperature-pressure field simulation, comprising: determining the vertical superposition relationship and the total thickness of the siltstone layer and the mud shale layer according to the vertical distribution characteristics of the lithologic properties of the overlying strata within a set range; obtaining the formula for preparing siltstone and mud shale respectively through experimental fitting; preparing a top plate rock sample by integral molding; arranging multiple groups of temperature sensors and pressure sensors on the side of the rock sample at set intervals; heating the rock sample to a set bottom temperature, pressurizing the rock sample to a set bottom pressure, and stabilizing at the temperature and pressure until the sensor measurement values ​​stabilize; determining the lower limit of the top plate sealing thickness according to the measurement values ​​of each sensor and the vertical superposition relationship; and similarly determining the lower limit of the bottom plate sealing thickness. This method can reasonably quantify the lower limit of the top and bottom plate sealing thickness of a complex lithologic shale reservoir by simplifying the joint simulation of lithologic properties and temperature and pressure fields.

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