A Method for Predicting Remaining Oil Distribution Using Time-Lapse Seismic Data
A time-lapse seismic and remaining oil technology, applied in the field of petroleum exploration and development, can solve the problems of differences in the absolute change of difference attributes, etc., and achieve the effects of improving accuracy, good applicability, and improving multi-solution problems
Active Publication Date: 2021-02-12
CHINA PETROLEUM & CHEM CORP +1
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However, some parameters not related to fluid in the reservoir (such as reservoir thickness, porosity, etc.) can also change, resulting in the absolute change of the differential attribute caused even in the case of the same change in the fluid saturation of the reservoir There are also differences
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Embodiment 1
[0044] The method for predicting remaining oil distribution using time-lapse seismic data in this embodiment is described by taking a work area as an example to illustrate the method for predicting remaining oil distribution using time-lapse seismic data in this embodiment.
[0045] 1. Situation of a work area
[0046] The main frequency of the seismic data in this area is about 80 Hz, and the thickness of the reservoir varies from 1 to 5 m. The P-wave impedance of mudstone is high, that of water-bearing sandstone is low, and that of oil-bearing sandstone is the lowest. Therefore, the seismic amplitude of oil layers is stronger than that of water-bearing sandstones. layer, which belongs to the “bright spot” type reservoir. At the time of the first seismic acquisition, there were no wells drilled in the local area of the work area. Through the interpretation of the seismic data collected for the first time, a lithologic reservoir was discovered and developed ( figure 1 ). A...
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The invention relates to a method for predicting remaining oil distribution by using time-lapse seismic data, belonging to the technical field of petroleum exploration and development. The invention provides a method for predicting remaining oil distribution using time-lapse seismic data, including calculating the relative change rate of the amplitude and the relative change rate of the longitudinal wave impedance. The data is corrected for consistency, and the relative change rate of the amplitude is calculated according to the obtained amplitude data after consistency correction; the relative change rate of the P-wave impedance is calculated according to the P-wave impedance data along the target horizon; the relative change rate of the P-wave impedance is calculated according to the P-wave impedance data; Relative rate of change of impedance to predict remaining oil distribution. The method for predicting remaining oil distribution by using time-lapse seismic data of the present invention is applied to actual oil reservoir development work, and good results are obtained, and the method has good applicability.
Description
technical field [0001] The invention relates to a method for predicting remaining oil distribution using time-lapse seismic data, belonging to the technical field of petroleum exploration and development. Background technique [0002] In the process of oilfield development, some reservoir parameters related to fluids will change due to the oil and gas in the reservoir being exploited, so the distribution of remaining oil can be predicted by using time-lapse seismic data. [0003] In the current time-lapse seismic remaining oil prediction technology, it is common to use the amplitude difference attribute obtained by direct subtraction and the inversion parameter difference attribute to reflect the distribution of remaining oil. For example, CN106383362A discloses a method for improving the identification ability of time-lapse seismic difference in thin reservoirs. This method uses time-lapse seismic data to obtain difference seismic data, and then performs phase conversion pr...
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IPC IPC(8): G01V1/30G01V1/28
CPCG01V1/282G01V1/306
Inventor 王鹏飞李锋刘焕李岩左丽群黎明李秋菊黎腾刘媛媛
Owner CHINA PETROLEUM & CHEM CORP