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Calculation method of porosity of lacustrine carbonate rock

A carbonate rock and calculation method technology, applied in the field of oil and gas exploration, can solve problems such as poor prediction of lacustrine carbonate rock porosity

Active Publication Date: 2021-06-04
CHINA NAT OFFSHORE OIL CORP +1
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  • Claims
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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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  • Calculation method of porosity of lacustrine carbonate rock
  • Calculation method of porosity of lacustrine carbonate rock
  • Calculation method of porosity of lacustrine carbonate rock

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Embodiment 1

[0041] Embodiment 1 provides a kind of computing method of lacustrine carbonate rock porosity, and this method comprises the following steps:

[0042] Step S1: Select the lacustrine carbonate reservoir, construct the wave impedance model of the lacustrine carbonate rock under the constraints of the stratigraphic framework, and obtain the seismic inversion model of the lacustrine carbonate rock;

[0043] Specifically, step S1 includes the following steps:

[0044] Step S11: Select lacustrine carbonate reservoirs, and obtain full-stack seismic data, logging data, formation velocity models and horizon data of lacustrine carbonate rocks, where the logging data includes wave impedance parameters;

[0045] Step S12: Construct the stratigraphic horizon framework of lacustrine carbonate rocks according to the sequence relationship of the subterranean horizons of lacustrine carbonate rocks and using horizon data;

[0046] Step S13: Carry out intersection statistical analysis of format...

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Abstract

The invention discloses a calculation method of porosity of lacustrine carbonate rock, and the method comprises the steps: firstly obtaining a seismic inversion model of the lacustrine carbonate rock; secondly, improving the spatial representation capability of the seismic inversion model of the lacustrine carbonate rocks through a multichannel spatial constraint seismic inversion method, and obtaining three-dimensional wave impedance parameters of the lacustrine carbonate rocks; and finally, realizing conversion between the three-dimensional wave impedance parameter and the porosity parameter of the lacustrine carbonate rock by utilizing a BP neural network algorithm, and obtaining the porosity parameter of the lacustrine carbonate rock. According to the invention, the three-dimensional wave impedance parameter in the seismic data of the lacustrine carbonate rock is successfully converted into the porosity parameter through calculation means such as a multi-channel space constraint inversion method and a BP neural network algorithm, so that the inversion precision of the longitudinal wave impedance is improved; errors caused by calculating the porosity through multivariate fitting are avoided, and the method can be used for predicting the lacustrine carbonate rock porosity.

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 ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V9/00
CPCG01V9/00
Inventor 史瑞其张世鑫贾怀存杜向东韩文明闫青华李丹孙林洁
Owner CHINA NAT OFFSHORE OIL CORP
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