Three-dimensional fault-dissolved body model making method

Abstract

The invention discloses a three-dimensional fault-dissolved body model making method. The core of the method is that only a specific waveform selected by a user can be modeled in a synthetic seismogram. The method comprises the following steps: firstly, the speed, the thickness and the scale of each geologic body of the fault-dissolved body are acquired and counted; a fault-dissolved body two-dimensional plane speed model is then drawn; equidistant drawing of several two-dimensional plane speed models is completed; a control point is found out on the two-dimensional plane; a ray is built fromthe point, and a mapping relationship with a next profile is built; and by using the same method, the same mapping with the next plane is built, the blank part between the planes is filled by using aspline interpolation method, so that the three-dimensional model is formed. The description of the internal and external structures of the fault-dissolved body is greatly improved, and accuracy of precise description of the fault-dissolved body is improved.

Description

technical field [0001] The invention relates to a modeling method for fault zone reservoirs in the field of petroleum and shale gas reservoir geology. The specific technology is a modeling method based on wavelet convolution of the vertical reflectivity logarithm, which can effectively improve the The accuracy of identification and prediction of the fault-karst body structure in the oilfield development stage and the accurate representation of the internal characterization of the fault-karst body. Background technique [0002] At present, with the deepening of oilfield exploration and development and the requirement to maintain stable oilfield production, and the current exploration and development technology has also made great progress, the target of oilfield exploration and development has gradually shifted from the previous anticline oil and gas reservoirs and structural oil and gas reservoirs Exploration of lithologic oil and gas reservoirs and subtle oil and gas reserv...

AI Technical Summary

Problems solved by technology

[0003] The outer zone of the fault fracture zone is characterized by the development of fractures, usually a single group of fractures, the degree of fracture development is significantly lower than that of the inner zone, the stratum is continuous, lacks breccia and cataclazed rock, and usually shows the same phase on the seismic section The axis is continuous, the amplitude is weakened, and the frequency is reduced. The outer zone of the fracture zone is gradually changing with the inner zone and the surrounding rock. It is usually difficult to identify the distribution of the outer zone on conventional seismic sections, which requires fine fracture and reservoir prediction methods.

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