High-temperature and high-pressure buried hill abnormal pressure cause analysis method

Abstract

The invention discloses a high-temperature and high-pressure buried hill abnormal pressure cause analysis method. The method comprises the following steps: determining a Raman spectrum of a methane inclusion of a high-temperature and high-pressure buried hill reservoir to be analyzed, a uniform temperature of a fluid inclusion, a burial history and a thermal history graph; determining the paleo-pressure when the methane inclusion is captured, obtaining the inclusion capturing time, and calculating the paleo-pressure coefficient when the methane inclusion is captured; establishing a two-dimensional profile numerical simulation model of the high-temperature and high-pressure buried hill reservoir, and correcting the model according to the logging pressure coefficient and the inclusion paleopressure coefficient to obtain a reliable numerical simulation model; according to a numerical simulation model, a pressure evolution history is recovered, pressure evolution characteristics of hydrocarbon source rocks, a transport system and a buried hill reservoir are tracked, and the cause of the abnormal pressure of the buried hill is analyzed by combining parameters such as a deposition rate, a hydrocarbon generation rate and a hydrocarbon generation amount, so that the cause of the abnormal pressure of the high-temperature and high-pressure buried hill gas reservoir can be effectively judged, and the result is reliable; reliable reference value can be provided for exploration and development of the oil and gas reservoir of the type.

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