Seismic identification method and device for connectivity of fault-dissolved body reservoir

A technology for seismic identification and connectivity, applied in seismology, measurement devices, seismic signal processing, etc., can solve problems such as inability to evaluate reservoir connectivity

Active Publication Date: 2019-07-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The advantage of the conventional description method of reservoir connectivity above is that it can accurately describe the connectivity of interwell reservoirs and determine formation parameters, but the disadvantage is tha

Method used

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  • Seismic identification method and device for connectivity of fault-dissolved body reservoir
  • Seismic identification method and device for connectivity of fault-dissolved body reservoir
  • Seismic identification method and device for connectivity of fault-dissolved body reservoir

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Experimental program
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Effect test

Embodiment 1

[0068] figure 1 A flow chart of a seismic identification method for fault-karst reservoir connectivity according to Embodiment 1 is shown. Such as figure 1 As shown, the method includes the following steps:

[0069] Step S110: Construct a seismic maximum likelihood volume based on the 3D seismic data volume.

[0070] Wherein, the three-dimensional seismic data volume specifically includes: a data set collected during seismic exploration and used for interpreting seismic sections.

[0071] According to the 3D seismic data volume collected in the process of seismic exploration, the maximum likelihood estimation algorithm is used to construct the seismic maximum likelihood volume. Among them, the maximum likelihood estimation algorithm is a statistical algorithm based on the maximum likelihood principle. The maximum likelihood estimation algorithm provides a way to estimate the parameters of the model given the observed data, that is: "the model is determined, but the paramet...

Embodiment 2

[0096] figure 2 A flow chart of a seismic identification method for fault-karst reservoir connectivity according to Embodiment 2 is shown. Such as figure 2 As shown, the method includes the following steps:

[0097] Step S210: Construct a seismic maximum likelihood volume based on the 3D seismic data volume.

[0098] Wherein, the three-dimensional seismic data volume specifically includes: a data set collected during seismic exploration and used for interpreting seismic sections.

[0099] According to the 3D seismic data volume collected in the process of seismic exploration, the maximum likelihood estimation algorithm is used to construct the seismic maximum likelihood volume. Among them, the maximum likelihood estimation algorithm is a statistical algorithm based on the maximum likelihood principle. The maximum likelihood estimation algorithm provides a way to estimate the parameters of the model given the observed data, that is: "the model is determined, but the param...

Embodiment 3

[0161] Figure 5 A device structure diagram of a seismic identification device for fault-karst reservoir connectivity according to Embodiment 3 is shown. Such as Figure 5 As shown, the device includes:

[0162] Seismic maximum likelihood body construction module 51, based on the three-dimensional seismic data volume, constructs the seismic maximum likelihood body;

[0163] The spatial contour carving module 52 of the fault-karst body uses the threshold value of the attribute of the earthquake maximum likelihood body to carry out spatial carving on the earthquake maximum likelihood body to obtain the spatial contour of the fault-karst body;

[0164] The formation pressure calculation module 53 selects the first point and the second point at the same altitude in the space of the fault-karst body, obtains the seismic root mean square velocity at the first point and the seismic root mean square velocity at the second point, and converts The seismic root mean square velocity at...

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Abstract

The invention discloses an earthquake identification method and device for the connectivity of a fault-dissolved body reservoir, and the method comprises the steps: building an earthquake maximum likelihood body based on a three-dimensional earthquake data volume; performing space engraving on the earthquake maximum likelihood body through the threshold value of the attribute of the earthquake maximum likelihood body to obtain the space contour of the fault-dissolved body; selecting a first point and a second point at the same altitude in the space of the fault-dissolved body, and obtaining the formation pressure at the first point and the formation pressure at the second point; comparing the formation pressure at the first point with the formation pressure at the second point, and judgingwhether the reservoir between the first point and the second point is connected or not according to a comparison result. According to the method, the earthquake maximum likelihood body is constructedby utilizing the three-dimensional earthquake data body, the formation pressures of the two points at the same altitude are calculated, reservoir connectivity identification is carried out based on the principle that the formation pressures at the same depth in the same fracture-cavity unit are equal, and the effective identification problem of reservoir connectivity in a well-free area or an area outside a well is solved.

Description

technical field [0001] The invention relates to the technical field of carbonate reservoir reserve prediction, in particular to a seismic identification method and device for fault-karst reservoir connectivity. Background technique [0002] The fault-karst body is a fractured zone of carbonate rock developed along the fault zone under the influence of multi-phase structural extrusion and tension. Multi-phase surface water infiltrates along the fault or local hydrothermal upwelling causes dissolution in the fractured zone. The fracture-cave system is simply understood as an aggregate of secondary dissolution pores, fractures, and fractures controlled by faults. Fault-karst bodies have strong heterogeneity, are distributed along the fault zone in the transverse direction, and are segmented, and distributed in a network shape in the longitudinal direction, with irregularities. [0003] In the process of realizing the present invention, it is found that the complexity of fault-...

Claims

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/306
Inventor 刘军廖茂辉李宗杰龚伟任丽丹王保才王鹏黄超李伟陈俊安陈黎范伟峰卢志强闫娥张荣
Owner CHINA PETROLEUM & CHEM CORP
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