Reconstruction method for three-dimensional heat flow space-time field in petroliferous basin

Abstract

The invention relates to a reconstruction method for a three-dimensional heat flow space-time field in a petroliferous basin. The reconstruction method includes following steps: 1), collecting and tidying basic data in the basin; 2), establishing a geologic history model in the basin; 3), establishing a vitrinite hydrocarbon dynamics calibration model; 4), constructing an objective function of ancient geothermal gradient and ancient ground surface temperature during various layer deposition periods; 5), solving the objective function; 6), evaluating a vitrinite reflectance space-time field in a basin inner well; 7), judging whether or not, analogue values and measured values of a single well vitrinite reflectance space-time field and a temperature field meet accuracy requirement; 8), establishing a rock thermal conductivity model; 9), reconstruct the three-dimensional heat flow space-time field of a single well; and 10), reconstructing the three-dimensional heat flow space-time field in the basin. The reconstruction method can be widely used for reconstruction of three-dimensional heat flow space-time fields in the petroliferous basin, and provides technical support for exploration and development of oil gas in the basin.

Description

technical field [0001] The invention relates to a method for reconstructing the space-time field, in particular to a method for reconstructing the space-time field of three-dimensional heat flow in oil-gas-bearing basins. Background technique [0002] At present, there are mainly four research methods for the simulation of thermal history in petroleum-bearing basins: 1. Algorithms with known geothermal gradient history, 2. Algorithms with known heat flow history, 3. Geothermodynamic method, 4. Geothermodynamics and geochemistry combination method. Relevant scholars have shown that the above four research methods of thermal history simulation have limitations in terms of research depth, research data acquisition or application, and operating speed. Specifically: the geothermal gradient used in the algorithm of the known geothermal gradient history is often a constant in a specified geological age, that is, the relationship between the geothermal gradient and depth is not con...

AI Technical Summary

Problems solved by technology

Specifically: the geothermal gradient used in the algorithm of the known geothermal gradient history is often a constant in a specified geological age, that is, the relationship between the geothermal gradient and depth is not considered, so the calculation results are inconsistent with the actual results; the known heat flow history The algorithm lacks relevant actual heat flow data, so its application has certain limitations; the geothermodynamic method does not take geochemical data as constraints, so the calculation results are higher or lower than the actual results, lack of actual verification, and have poor reliability; The combination of geothermodynamics and geochemistry is an inversion technique based on the sedimentary burial history of a single well (or two-dimensional profile), taking into account the vitrinite reflectance (R o ), formation temperature and other thermal parameters, inversely deduce the heat flow history of the basin

To sum up, the current research on the space-time field of heat flow mainly focuses on one-dimensional and two-dimensional aspects, but the research on the space-time field of three-dimensional heat flow does not involve

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