Method for Computing the Variance Volume of a Formation
A variance volume and stratigraphic technology, applied in the field of seismic exploration data processing, can solve problems such as unpredictable fractures, and achieve the effect of reducing multi-solution and intuitive application.
Active Publication Date: 2017-04-05
BC P INC CHINA NAT PETROLEUM CORP +1
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[0008] An exemplary embodiment of the present invention is to provide a method for calculating the variance body of the formation, which can solve the problem that the variance body calculated by the existing method is difficult to predict relatively small-scale fractures
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[0028] Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like numerals refer to like parts throughout. The exemplary embodiments are described below in order to explain the present invention by referring to the figures.
[0029] figure 1 A flowchart illustrating a method of calculating a variance volume of a formation according to an exemplary embodiment of the present invention.
[0030] refer to figure 1 , in step S10, selecting a predetermined number of azimuths, and acquiring seismic data volumes of the selected azimuths in the pre-stack seismic data. The pre-stack seismic data is the original data obtained by field exploration and acquisition by methods known in the art, after seismic data processing (including spherical divergence correction known in the art, Q compensation for formation absorption, amplitude processing, wavelet defolding, etc.) The pre-st...
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Provided in the utility model is a method for calculating a variance cube of a stratum. The method comprises: (a), selecting a predetermined number of azimuth angles and obtaining seismic data volumes of the selected azimuth angles in pre-stack seismic data; (b), obtaining seismic data with a predetermined time window length by using one target point in the seismic data volumes as the center among the seismic data volumes of the selected azimuth angles; (c), calculating variance yields of seismic data of different azimuth angles at each time point within the predetermined time window length and carrying out weighted average operation on the variance yields of all time points so as to obtain a first weighted average value; (d), calculating mean square values of seismic data of different azimuth angles at each time point within the predetermined time window length and carrying out weighted average operation on the mean square values of all time points so as to obtain a second weighted average value; and (e), calculating a variance cube of the target point. According to the method, more small or micro fracture systems with small dimensions can be predicted and the multiplicity of solution of fracture prediction can be reduced.
Description
technical field [0001] The present invention generally relates to the technical field of seismic exploration data processing, and more specifically relates to a method for calculating the variance volume of formations. Background technique [0002] Fractured oil and gas reservoirs are widely distributed in my country and are an important field of oil and gas exploration in my country. In recent years, more and more fractured oil and gas reservoirs have been discovered, such as Ordovician carbonate rock fractured cave reservoirs in the Tarim Basin, mudstone fractured reservoirs in the Qaidam Basin, Ordovician carbonic acid reservoirs in the Dagang Oilfield (Chenghai). Salt rock fracture-cavity reservoirs, tight sandstone fracture reservoirs in Sichuan, etc., especially shale reservoirs that have received extensive attention in recent years are typical fracture reservoirs, and the prediction of complex fracture networks is a key factor for the effective development of shale ga...
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IPC IPC(8): G01V1/28
Inventor 张洞君邹文陶正喜钱峰谭荣彪赵振伟周晶晶范晓吴秋波赵尧
Owner BC P INC CHINA NAT PETROLEUM CORP