Abstract: The present disclosure discloses a numerical simulation method and system suitable for the effect of clay minerals on brittleness in continental shale, which belongs to the technical field of rock mechanical properties research. In the process of digital core stress simulation, the method of adjusting the number of pixels, coordinates, mechanical properties, and boundary conditions is used to simulate the content and distribution of geological components, the types of clay minerals and the changes caused by deep burial in the evolution process of clay minerals, and then determine the influence coefficient of each factor on brittleness. The present disclosure can make up for the defect that the single factor of natural samples is uncontrollable, and the three-dimensional digital core model is adjusted by the double verification method, which improves the authenticity and reliability of the simulation results.

Abstract: A method for predicting clay mineral development in lacustrine shale based on artificial intelligence is disclosed. The method comprises acquiring logging data of lacustrine shale, collecting rock samples of lacustrine shale, performing data preprocessing on the collected logging data, and acquiring types and contents of clay minerals in shale development a prediction model of clay mineral development is then developed based on an artificial intelligence. The artificial intelligence-based prediction model of clay mineral development is then optimized; and clay mineral development in lacustrine shale is predicted. In the present disclosure, the accuracy and efficiency of existing prediction methods are improved, allowing for the rapid acquisition of valuable information for the exploration and development of lacustrine shale.

Abstract: A quantitative simulation method for contributions of three origin of overpressure in sandstone is provided. Analytical testing data, well logging data, geological data, seismic data, and the like are collected and collated. A formation pressure characteristic of sandstone of a target horizon is analyzed and a burial history and a thermal history of the sandstone of the target horizon is reconstructed. An undercompacted pore pressure evolution history and an undercompacted hydrocarbon generation pressurized pore pressure evolution history, and a total pore pressure evolution history is quantitatively simulated. A quantitative analysis is performed on contributions of three origin of overpressure: quantitatively analyzing contributions of undercompaction, pressurization by hydrocarbon generation, and other origin to overpressure according to Ptotal=Punderc+Phydrog and Ptotal=Punderc+Phydrog+Ptotal to obtain overpressure evolution mechanisms of three origins.