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

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.

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...

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Problems solved by technology

The earliest quantitative pressure prediction was Hottman and Johnson (1965). Using the resistivity and acoustic time difference logging data in the previous drilling, they created the formation pressure prediction and monitoring method of the equivalent depth method, and found that only the equivalent depth method Formation pressure cannot be predicted with complete accuracy, in some formations appropriate empirical relationships must be established

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