A Calculation Method of Porosity of Lacustrine Carbonate Rock

Abstract

The invention discloses a method for calculating the porosity of lacustrine carbonate rocks. Firstly, the seismic inversion model of lacustrine carbonate rocks is obtained; The three-dimensional wave impedance parameters of lacustrine carbonate rocks can be obtained by using the spatial representation ability of the seismic inversion model of lacustrine rocks; finally, the transformation of three-dimensional wave impedance parameters and porosity parameters of lacustrine carbonate rocks is realized by using the BP neural network algorithm, and the obtained Porosity parameters of lacustrine carbonate rocks. The method for calculating the porosity of lacustrine carbonate rocks disclosed by the present invention successfully realizes the three-dimensional wave impedance in the seismic data of lacustrine carbonate rocks by means of multi-channel space constraint inversion method, BP neural network algorithm and other computing means. The parameters are converted into porosity parameters, which improves the inversion accuracy of P-wave impedance, avoids the error caused by multivariate fitting calculation of porosity, and can be used to predict the porosity of lacustrine carbonate rocks.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a method for calculating the porosity of lacustrine carbonate rocks. Background technique [0002] Lacustrine carbonate rock is the most widely distributed type of continental carbonate rock. The deep-water pre-salt rift stage of the Campos Grande Basin in Brazil is rich in oil and gas resources, and the target layer is the lacustrine carbonate rock reservoir. Due to the high drilling cost of deepwater oil and gas exploration, lacustrine carbonate reservoirs with high porosity properties are the prerequisite for efficient exploration, so the accuracy of porosity prediction is very important. At present, there are two methods for porosity calculation in the stage of oil and gas exploration. One is the empirical formula method, that is, based on the fitting relationship between porosity and elastic parameters such as P-wave impedance, the calculation of porosity is ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for calculating the porosity of lacustrine carbonate rocks to solve the problem that the existing empirical formula method and seismic inversion method cannot predict the porosity of lacustrine carbonate rocks well

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