Multi-scale fractured reservoir forward model establishing method
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A technology for fractured reservoir and forward modeling, which is applied in the field of exploration geophysical data processing and can solve the problems of small model grid and slow calculation rate.
Active Publication Date: 2015-07-01
CHINA PETROLEUM & CHEM CORP +1
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This method directly establishes the fracture model. To establish a high-precision fracture model, the model
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Embodiment 1
[0029] Embodiment 1, at first in conjunction with attached figure 1 The technical solution of the present invention is further described.
[0030] Step 1. Using the layer velocity data based on seismic velocity spectrum, P-wave impedance inversion data and lithology inversion data to establish a lateral heterogeneity model for dominant reservoirs. The meaning of each data and the specific establishment method are as follows.
[0031] The meaning of each data: The layer velocity data based on the seismic velocity spectrum refers to the formation layer velocity data obtained by calculation based on the stacking velocity extracted from the seismic velocity spectrum data.
[0032] The compressional wave impedance inversion data refers to the formation compressional wave impedance data obtained by inversion using seismic data and logging data.
[0033] Lithology inversion data is a kind of lithology data obtained by geostatistical inversion based on geological model, taking well ...
Embodiment 2
[0040] Embodiment 2, in conjunction with attached Figure 1-8 As shown, the detailed description is as follows.
[0041] figure 1 It is a flow chart of a specific embodiment of the method for establishing a multi-scale fractured reservoir forward model of the present invention.
[0042] Step 101, use the same grid parameters to grid the layer velocity data based on the seismic velocity spectrum, the compressional wave impedance inversion data, and the lithology inversion data to obtain the layer velocity grid data based on the seismic velocity spectrum, the compressional wave impedance Inversion grid data and lithology inversion grid data.
[0043] Step 102, using the P-wave impedance inversion data to calculate and obtain inversion layer velocity data.
[0044] Step 103, scan the lithology inversion grid data point by point, and judge whether each model grid is the dominant reservoir lithology.
[0045] If the grid is of dominant reservoir lithology, it is given the inversi...
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Abstract
The invention relates to the field of exploration geophysical data processing methods, and particularly relates to a multi-scale fractured reservoir forward model establishing method. First, a laterally heterogeneous model for a predominant reservoir is established by using interval velocity data based on the seismic velocity spectrum, P-wave impedance inversion data, and lithologic inversion data; then, the geometrical shape of a fracture is determined by a seismic detection method for different scales of seismic curvature or seismic coherence, and the fracture is given geophysical parameters based on well shock and is embedded to the obtained laterally heterogeneous model; and finally, a laterally and longitudinally heterogeneous multi-scale fractured reservoir model is established. The fractured reservoir model established by the method fully utilizes well shock data, truly reflects the development regularity and distribution characteristics of the fracture, and provides a basis for performing fractured reservoir forward modeling in the next step, understanding the wave field response characteristics and geophysical attributive characteristics of a fractured reservoir and improving the accuracy of reservoir prediction.
Description
technical field [0001] The invention relates to the field of exploration geophysical data processing methods, in particular to a multi-scale fracture reservoir forward model establishment method. Background technique [0002] Fractured oil and gas reservoirs are formed in various rocks such as mud shale, metamorphic rock and carbonate rock. Fracture itself can be used as a storage space to store oil and gas, and can also be a channel for oil and gas migration, which is an important type of storage space. There are generally two ways to establish the fracture forward model commonly used at present: 1. The more commonly used ones are anisotropy theory and fracture equivalent theory. Both thin and fractured reservoirs are considered to be anisotropic in general. The relationship between the fracture model parameters and the anisotropy parameters is established through the equivalent theory, and then the numerical simulation is carried out using the anisotropy forward modeling...
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