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A P-wave Velocity Prediction Method for Rock Systems in Heterogeneous Reservoirs

A technology for heterogeneous oil reservoirs and longitudinal wave velocity, which is applied in the seismology and seismic signal processing for logging records, and can solve the problem that the seismic detection engineering of heterogeneous oil reservoirs cannot be applied, the physical process cannot be completed, and the Non-uniform and complex formation engineering application and other issues

Active Publication Date: 2015-12-09
PETROCHINA CO LTD
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Problems solved by technology

[0008] (1) The conventional fluid replacement method is the Biot-Gassmann equation. The assumption of this equation is that all pores inside the rock are completely uniform, so this assumption cannot meet the engineering application of heterogeneous and complex formations
[0009] (2) The dual-porous medium model proposed by Ba Jing et al. in 2012 ignores the local flow velocity field in the embedded body, cannot fully describe the physical process of local flow vibration, and cannot be applied to the situation where the fluid kinetic energy of the embedded body cannot be ignored, so Mainly used in petrophysical modeling of heterogeneous gas reservoirs, but not in seismic detection engineering of heterogeneous oil reservoirs

Method used

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  • A P-wave Velocity Prediction Method for Rock Systems in Heterogeneous Reservoirs
  • A P-wave Velocity Prediction Method for Rock Systems in Heterogeneous Reservoirs
  • A P-wave Velocity Prediction Method for Rock Systems in Heterogeneous Reservoirs

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Embodiment 1

[0030] This embodiment provides a method for predicting the compressional wave velocity of rocks in heterogeneous reservoirs, such as figure 1 As shown, the method includes:

[0031] Step S100, obtaining permeability, porosity, shale content, mineral composition, mineral volume ratio according to well logging data, geological report, mud logging data and rock experiment observation, and obtaining pore fluid data according to fluid experiment measurement;

[0032] The purpose of this step is to obtain accurate and reliable rock physical parameters and fluid parameters, so as to provide a reliable data basis for predicting the rock compressional wave velocity of heterogeneous reservoirs.

[0033] Step S101, using the permeability, porosity, shale content, mineral composition, and mineral volume ratio to establish a rock dry skeleton model, and using pore fluid data to establish an embedded body fluid model;

[0034]In this step, the establishment of the rock skeleton model is m...

Embodiment 2

[0098] This example quantitatively predicts the velocity and attenuation of longitudinal waves in the full-band "water-in-oil" double-porous medium:

[0099] In this embodiment, an oil-water unsaturated rock physics model is designed. The basic rock physics parameters are: the bulk modulus of the matrix is ​​35Gpa, the bulk modulus of the skeleton is 7Gpa, the shear modulus of the skeleton is 9Gpa, and the average density of the matrix is ​​2650Kg / m 3 , the bulk modulus of oil is 0.6Gpa, and its density is 900Kg / m 3 , the bulk modulus of water is 2.25Gpa, and its density is 990Kg / m 3 , with a porosity of 0.15 and a permeability of 0.1×10 -12 m 2 , the viscosity of water is 0.001Pa·s, the viscosity of oil is 0.006Pa·s, the average bubble size is 0.25m, figure 2 and image 3 They are schematic diagrams of the theoretically predicted changes in P-wave velocity and attenuation before and after improvement when the frequency is 0.01-10000 Hz and the saturation is 0-100%.

Embodiment 3

[0101] In this example, the experimental data of oil-water saturated rock samples in the Sugaitebulak area of ​​Aksu City are compared with the theoretical prediction data:

[0102] The main component of the sample is dolomite, the degree of cementation is very high, the permeability is 0.174md, the porosity is 0.0547, the average embedded body size is set to 0.035mm, and its main physical parameters are:

[0103] (i) The bulk modulus of the rock skeleton is 76.2Gpa, and the shear modulus is 30.67Gpa;

[0104] (ii) The bulk modulus of rock particles is 94.9Gpa, the shear modulus is 45Gpa, and the density is 2870Kg / m 3 ;

[0105] (iii) The fluids used in the experiment are oil and water, the bulk modulus of water is 2.25Gpa, the bulk modulus of oil is 0.6Gpa, the viscosity of water is 0.001Pa·s, the viscosity of oil is 0.006Pa·s, and the density of water is 990Kg / m 3 , the density of oil is 900Kg / m 3 ;

[0106] (iv) The frequency used in the experiment is 800KHz, Figure...

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Abstract

The invention provides a method for predicting the velocity of a longitudinal wave of a rock system in a heterogeneous reservoir. The method for predicting the velocity of the longitudinal wave of the rock system in the heterogeneous reservoir comprises the steps of (1) obtaining the permeability, the porosity, the shale content, mineral constituents, mineral volume rates and pore fluid data, (2) building a rock bare-skeleton model and an embedded body fluid model, (3) calculating the velocity of fluid inside an embedded body according to the embedded body fluid model, (4) calculating the kinetic energy function and the dissipative energy function of a double-pore medium according to the velocity of the fluid inside the embedded body, (5) using the kinetic energy function and the dissipative energy function of the double-pore medium to export an improved Biot-Rayleigh equation set according to the Hamilton principle and the Lagrange equation, and (6) predicting the velocity of the longitudinal wave of rock in the heterogeneous reservoir through plane wave analysis and the improved Biot-Rayleigh equation set. The method for predicting the velocity of the longitudinal wave of the rock system in the heterogeneous reservoir takes full consideration of anisotropism of the rock system and fluid kinetic energy caused by a fluid velocity field inside the embedded body and dissipative energy caused by the fluid velocity field inside the embedded body, can predict the velocity of the longitudinal wave of the oil-in-water double-pore rock system, overcome the defects of an original Biot-Rayleigh equation set, and retain the advantage, of the original Biot-Rayleigh equation set, of being simple in format.

Description

technical field [0001] The invention relates to the technical field of rock compressional wave prediction, in particular to a compressional wave velocity prediction method for rock systems in heterogeneous oil reservoirs. Background technique [0002] Facing the severe situation of increasing international energy demand, the exploration of oil and gas resources is still the main work goal of various oil companies. Although with decades of exploitation, most oilfields in China have entered the late period of high water cut or even the period of extremely high water cut, the remaining oil production is still very considerable, and the remaining underground oil is in a state of "highly dispersed overall and relatively enriched locally", so In the excavation process of remaining oil in high water-cut period, it is very necessary to carry out prediction research of reservoir physical parameters. As the basis of oil and gas exploration, rock physics can provide various sensitive ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/50
Inventor 巴晶吴国忱张琳孙卫涛晏信飞
Owner PETROCHINA CO LTD
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