Method for carrying out well design by using time-lapse seismic

Abstract

The invention discloses a method for carrying out well design by using time-lapse seismic, which comprises the following steps: 1) respectively obtaining seismic data of two different time points according to methods of the step a and the step b: a. detecting the stratum basic parameters of a region to be detected, manufacturing an oil deposit profile of the region to be detected, establishing a stratum profile module according to the oil deposit profile, and obtaining three data bodies: the longitudinal wave speed, the transverse wave speed and the density according to the stratum basic parameters and the stratum profile module; and b. carrying out AVO forward modeling to obtain the overlapped seismic data of each incidence angle; 2) processing the seismic data in the two times to obtain seismic data difference; 3) carrying out reversion on the seismic data difference to obtain longitudinal wave difference, transverse wave difference, density difference and longitudinal and transverse wave speed ratio difference; 4) predicting the oil deposit parameter change; and 5) carrying out well design. The invention forms the difference reversion based on the time-lapse seismic for realizing the oil deposit parameter change prediction process and determining the well design, and the goal can not be realized by using conventional methods.

Description

technical field [0001] The invention relates to the field of time-lapse seismic, in particular to a method for deploying oil wells by using time-lapse seismic. Background technique [0002] Time-lapse seismic is currently an effective means for monitoring oil and gas reservoirs, rationally adjusting development plans, and improving oil and gas recovery. Its main purpose is to analyze and study the reservoir fluid movement, fluid composition changes, and fluid saturation changes caused by the oil and gas reservoir exploitation process. Changes in seismic response caused by changes in reservoir properties such as pressure changes, porosity and temperature changes, and inversion of changes in reservoir properties by seismic response changes. The essence of the change of seismic response is the change of the elastic parameters (velocity and density) of the underground reservoir. Establishing the statistical relationship between elastic parameters and reservoir parameters can rea...

AI Technical Summary

Problems solved by technology

Among them, time-lapse seismic inversion is a commonly used method at present, but the usual method is to invert based on two independent seismic data volumes, obtain elastic parameters respectively, and obtain elastic parameter difference data by calculating the difference of elastic parameters, that is, first invert and then calculate Poor process, based on the difference in elastic parameters, the reservoir parameters can be predicted (see figure 2 ,Right now figure 1 The realization process of scheme 1 in the above), whether the difference of time-lapse seismic data can be directly used to perform inversion and complete the process of reservoir parameter prediction (see image 3 ,Right now figure 1 Implementation process of Scheme 2) No data available

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