A method for constructing oil and gas reserves prediction model of fault-lithologic oil and gas reservoirs

Abstract

A method for constructing oil and gas reserves prediction models of fault-lithologic oil and gas reservoirs. It includes the following steps: (1) determining the influencing factors for the formation of the fault-lithologic oil and gas reservoir; (2) calculating the weighting coefficient of the oil and gas reserves of the fault-lithologic oil and gas reservoir, the relationship between the pros and cons of each influencing factor and the weighting coefficient; (3) Establish a comprehensive prediction model of oil and gas reserves based on the determined dominant factors influencing accumulation, and use the least squares method to estimate the regression coefficient of the model; (4) Calculate the judgment index to test the prediction model, and gradually increase the number of dominant factors , choose the judgment index R 2 The model corresponding to the smallest value is the reserve prediction model of the final fault-lithologic reservoir. The model constructed by the method of the present invention can not only effectively predict the oil and gas reserves of fault-lithologic oil and gas reservoirs, the prediction result has small error and high accuracy, but also overcomes the subjective influence of artificially assigned weight values ​​and less drilling data. The disadvantage is that the experimental workload is reduced.

Description

Technical field: [0001] The invention relates to the technical field of oil and gas exploration, in particular to a method for how to construct a prediction model of oil and gas reserves. Background technique: [0002] Fault-lithologic reservoirs refer to oil and gas reservoirs formed by the dual factors of faults and lithology. During the rifting period of tectonic evolution, continental basins generally experience the stages of rapid basement subsidence, expansion of lake basin area, and rapid deepening of water bodies, which greatly promotes the development of high-quality lacustrine source rocks and deep delta sand body assemblages on the edge of lake basins. Generally speaking, the deep delta sand bodies developed on the edge of the lake basin have good reservoir properties, because the uplift around the lake basin has been weathered and denuded for a long time, and it is a good large-scale provenance area, which can be the sand body of the downturn side of the uplift. ...

AI Technical Summary

Problems solved by technology

Fault-lithology reservoirs are an important method of accumulation under the coupling of structure and lithology. Currently, there is no technical solution for determining the dominant factors of fault-lithology reservoirs and the prediction model for oil and gas reserves in the open literature.

The reserve prediction model of similar oil and gas reservoirs (such as buried hill oil and gas reservoirs) that can be used as a reference relies on expert judgment for weighting. This reserve prediction model does not make full use of objective information, resulting in strong human subjectivity and chance, and lacks objectivity , after being experimentally applied to the prediction of oil and gas reserves in fault-lithologic reservoirs, it is found that it is not applicable

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