Seismic lithofacies prediction method and system based on virtual well stochastic simulation
A technology of stochastic simulation and prediction method, applied in the field of seismic lithofacies prediction, which can solve problems such as difficulty in evaluating the uncertainty of lithofacies prediction results
Active Publication Date: 2021-08-24
CHINA PETROLEUM & CHEM CORP +1
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This method ignores the influence of factors such as the uncertainty of seismic inversion results and the scale difference of well seismic data on reservoir seismic lithofacies identification, and it is difficult to evaluate the uncertainty of lithofacies prediction results. wait brings certain risks
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[0037] The present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
[0038] figure 1 A flowchart showing the steps of the seismic lithofacies prediction method based on virtual well stochastic simulation according to the present invention.
[0039] In this embodiment, the seismic lithofacies prediction method based on virtual well stochastic simulation according to the present invention may include: Step 101, for an actual seismic trace data, a plurality of virtual wells are generated based on Markov prior constraints, each virtual well The well inclu...
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A seismic lithofacies prediction method and system based on virtual well random simulation are disclosed. The method may include: for an actual seismic trace data, multiple virtual wells are generated based on Markov prior constraints, and each virtual well includes lithofacies and reservoir parameters; The simulated seismic trace data corresponding to the virtual well; the optimal similarity coefficient between the simulated seismic trace data corresponding to each virtual well and the actual seismic trace data is calculated, and N virtual wells with the largest optimal similarity coefficient are selected as the preferred virtual wells to optimize the virtual wells. The lithofacies type that appears most frequently in the well is taken as the lithofacies type of the actual seismic trace. The present invention simulates a large number of virtual wells, establishes the relationship between logging and earthquakes, matches virtual well simulation records with actual seismic records, realizes lithofacies prediction, can avoid errors caused by seismic inversion, is suitable for areas with less drilling, and reduces human intervention.
Description
technical field [0001] The invention relates to the technical field of seismic exploration, and more specifically, to a seismic lithofacies prediction method and system based on virtual well random simulation. Background technique [0002] Reservoir lithofacies distribution information has important reference significance for reservoir description. The traditional method first obtains reservoir elastic parameter information through seismic inversion, and then further converts it into lithofacies information based on petrophysical modeling. This method ignores the influence of factors such as the uncertainty of seismic inversion results and the scale difference of well seismic data on reservoir seismic lithofacies identification, and it is difficult to evaluate the uncertainty of lithofacies prediction results. Waiting brings certain risks. Therefore, it is necessary to develop a seismic lithofacies prediction method and system based on virtual well stochastic simulation. ...
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IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/624
Inventor 李京南刘婵娟
Owner CHINA PETROLEUM & CHEM CORP