Seismic identification method and device for fault-karst reservoir connectivity

A technology of earthquake identification and connectivity, applied in seismology, measurement devices, seismic signal processing, etc., can solve the problem of inability to evaluate the connectivity of reservoirs

Active Publication Date: 2021-02-09
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 that the connectivity of reservoirs in areas without wells or areas outside wells cannot be evaluated.
At present, there is no effective method at home and abroad to identify the connectivity of reservoirs without wells or outside wells

Method used

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  • Seismic identification method and device for fault-karst reservoir connectivity
  • Seismic identification method and device for fault-karst reservoir connectivity
  • Seismic identification method and device for fault-karst reservoir connectivity

Examples

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 profiles.

[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 profiles.

[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 a seismic identification method and device for fault-karst reservoir connectivity. The method includes: constructing an earthquake maximum likelihood body based on a three-dimensional seismic data volume; The likelihood body performs space carving to obtain the spatial outline of the fault-karst body; select the first point and the second point at the same altitude in the space of the fault-karst body to obtain the formation pressure at the first point and the formation pressure at the second point ; Comparing the formation pressure at the first point and the formation pressure at the second point, and judging whether the reservoir between the first point and the second point is connected according to the comparison result. The present invention utilizes three-dimensional seismic data volumes to construct seismic maximum likelihood volumes, calculates formation pressures at two points at the same altitude, and identifies reservoir connectivity based on the principle that formation pressures at the same depth in the same fracture-cavity unit are equal, solving the problem of no-well The problem of effective identification of reservoir connectivity in regional or out-of-well regions.

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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Patent Type & Authority Patents(China)
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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