Method for predicting three-dimensional abnormal pore pressure based on rock physical seismic information

A technology of pore pressure and rock physics, applied in the field of oil and gas exploration and development data processing, can solve problems such as incomplete and accurate prediction of formation pressure

CN106368691AActive Publication Date: 2017-02-01CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-02-01

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Abstract

The invention relates to a method for predicting three-dimensional abnormal pore pressure based on rock physical seismic information. The method comprises the steps that the lithologic stratum matrix bulk modulus is calculated by applying parameters of the rock physical longitudinal wave velocity, transverse wave velocity and density, rock core geological analysis is additionally conducted so as to calculate the dry pore spatial rigidity, the pore pressure coefficient is obtained accordingly, and the single-well stratum abnormal pore pressure is calculated; and secondly, a three-dimensional data cube of the longitudinal wave impedance, the transverse wave impedance, Poisson ratio and the density is obtained by applying a three-dimensional seismic reflection data cube and three-dimensional prestack elastic wave impedance retrieval method, and the three-dimensional stratum abnormal pore pressure is predicted by reference to the single-well stratum abnormal pore pressure calculation method and an obtained empirical formula. According to the method for predicting the three-dimensional abnormal pore pressure based on the rock physical seismic information, rock physical parameters obtained indirectly through logging and seismic geophysical methods are applied to prediction of the abnormal stratum pore pressure, and the practice is easier compared with direct measuring of rock physical parameters in a laboratory, more scientific compared with subjective parameter presetting, and finer compared with calculation separately through post-stack seismic velocity.
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Description

technical field

[0001] The present invention relates to the field of data processing methods for oil and gas exploration and development. It mainly utilizes geophysical information obtained from well logging and seismic data and petrophysical parameters to predict the abnormal pore pressure of formations and serve the exploration and development of oil and gas fields, such as analysis of oil and gas migration and accumulation, Well site preparation before drilling, etc. Background technique

[0002] Formation pressure and formation temperature are important basic parameters for oil and gas field development. The formation pressure and temperature of oil and gas reservoirs not only determine the properties of oil and gas fluids, but also determine the way of oil and gas field development, the technical characteristics and economic costs of oil and gas extraction, and the ultimate recovery rate.

[0003] Abnormal formation pressure environment is a common geological phenomeno...

Examples

Embodiment Construction

[0054] Such as figure 1 As shown, the implementation of the invention is mainly divided into the following steps:

[0055] (1) Comprehensive analysis of logging data, lithology, lithoelectric characteristics, and geological stratification of drilled wells to obtain rock geophysical parameters (acoustic compressional wave velocity, shear wave velocity, and density) and other information at the well point. The compressional wave velocity and density of multiple wells are intersected, and the empirical relationship between the compressional wave velocity and density is established.

[0056] (2) Using acoustic logging and density logging to obtain the porosity formula, inversely calculate the acoustic wave velocity and density of the formation skeleton, so as to obtain the formation matrix bulk modulus K 0 .

[0057] (3) Combining with the pore type composition and components of the well point, the formula of stress seeking pore space stiffness is used to calculate the formation...