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A Reservoir and Fluid Prediction Method Based on P-wave Amplitude-Free Prestack Inversion without Well Constraint

A pre-stack inversion and well-constrained technology, which is applied in the field of petroleum exploration, can solve the problems of insufficient model accuracy, low resolution of results, and inability to estimate seismic wavelets, so as to improve the inversion accuracy and overcome the effect of extremely low resolution

Inactive Publication Date: 2016-04-13
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

However, this method cannot estimate accurate seismic wavelets, and the accuracy of the established model is not enough, resulting in extremely low resolution of the final inversion results, which is difficult to meet the needs of reservoir and fluid prediction

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  • A Reservoir and Fluid Prediction Method Based on P-wave Amplitude-Free Prestack Inversion without Well Constraint
  • A Reservoir and Fluid Prediction Method Based on P-wave Amplitude-Free Prestack Inversion without Well Constraint
  • A Reservoir and Fluid Prediction Method Based on P-wave Amplitude-Free Prestack Inversion without Well Constraint

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[0029] The following describes the specific implementation of the present invention in conjunction with examples and accompanying drawings.

[0030] figure 1 In order to actually test the superimposed data and its frequency spectrum in the work area, it can be seen that the two sets of arrows point to two sets of potential reservoirs respectively. Among them, organic reef reservoirs are mainly distributed in the Meishan Formation (top T40, bottom T50), as shown by the yellow downward arrow on the figure. In addition, there may be sand bodies distributed in the Sanya Formation and Lingshui Formation, as indicated by the upward green arrow on the right side of the figure. The main frequency of the full stack seismic data is about 34Hz.

[0031] figure 2 for figure 1 The seismic layer velocity corresponding to the survey line, which characterizes the approximate distribution of sedimentary structures macroscopically.

[0032] image 3 It is the result of well-seismic calib...

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Abstract

The invention relates to a reservoir and fluid prediction method implemented on the basis of well-constraint-free prestack inversion of the longitudinal wave amplitude. According to the method, longitudinal wave data are obtained by adopting the prestack linear inversion method, a new pseudo-well curve reconstitution equation is built by combining the longitudinal wave amplitude and apriori information to obtain various pseudo-well curves with the higher resolution ratio, and therefore the well-constraint-free prestack inversion method based on the longitudinal wave amplitude is finally built to obtain high-quality elastic parameters. Applied actual data verify that the well-constraint-free prestack inversion method based on the longitudinal wave amplitude can be used for obtaining the high-quality elastic parameters with the higher resolution ratio. The method has the advantages of being capable of directly applied to actual exploration of well-free regions and obtaining the elastic parameters of well position arrangement.

Description

technical field [0001] The invention belongs to the field of petroleum exploration, and in particular relates to a method for predicting reservoirs and fluids based on compressional wave amplitude-based pre-stack elastic parameter inversion without well constraints, which is suitable for the exploration of well-free areas. Background technique [0002] Prestack inversion can simultaneously obtain multiple elastic parameters such as P-wave, S-wave, P-to-S wave velocity ratio, Poisson’s ratio, and Lamé constant, so that a more accurate comprehensive prediction of reservoir and fluid can be made from the elastic domain (Zhang et al., 2013 ). The theoretical basis of its application is mainly derived from the theory of plane wave incidence and transmission - the Knot-Zoeppritz equation. The widely used Aki&Richards reflection coefficient formula for longitudinal wave incidence is: [0003] R pp ( θ ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 孙赞东张远银韩剑发
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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