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Braided river sedimentary heterogeneous tight sandstone gas reservoir geological modeling method

A technology for tight sandstone gas reservoirs and geological modeling, applied in the field of geological modeling of heterogeneous tight sandstone gas reservoirs in braided river sediments, can solve the problem of reducing the degree of research precision, inability to finely dissect sand bodies and effective sand bodies, heterogeneous Solve the problems of low average coincidence rate in geological modeling of tight sandstone gas reservoirs, so as to improve reliability and refinement

Active Publication Date: 2018-12-07
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The first purpose of the present invention is to overcome the limitation of gas reservoir development in the prior art. The conventional well pattern cannot finely dissect sand bodies and effective sand bodies, which reduces the fineness of the research; the second purpose is to establish heterogeneous and dense braided river deposits Low average agreement rate of sandstone gas reservoir geological modeling

Method used

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  • Braided river sedimentary heterogeneous tight sandstone gas reservoir geological modeling method
  • Braided river sedimentary heterogeneous tight sandstone gas reservoir geological modeling method
  • Braided river sedimentary heterogeneous tight sandstone gas reservoir geological modeling method

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Embodiment 1

[0034] A geological modeling method for braided river sedimentary heterogeneous tight sandstone gas reservoirs, characterized in that it at least includes the following steps:

[0035] 1) Establish the internal structure model of the braided river reservoir;

[0036] 2) Establish a geological knowledge base of braided river reservoirs;

[0037] 3) Using the internal structure model of the braided river reservoir as the framework, apply the stochastic modeling method based on the target body, input the parameters of the geological knowledge base of the braided river reservoir, establish multiple realization models and select the realization model with the highest coincidence rate As the training image of multi-point geostatistical modeling, the seismic attributes are selected as the soft constraints of the training image to establish multiple realization models again, and the realization model with the highest coincidence rate is selected as the braided river sedimentary facies...

Embodiment 2

[0039] Such as figure 1 As shown, a geological modeling method for braided river sedimentary heterogeneous tight sandstone gas reservoirs at least includes the following steps:

[0040] 1) Establish the internal structure model of the braided river reservoir;

[0041] 2) Establish a geological knowledge base of braided river reservoirs;

[0042] 3) Using the internal structure model of the braided river reservoir as the framework, apply the stochastic modeling method based on the target body, input the parameters of the geological knowledge base of the braided river reservoir, establish multiple realization models and select the realization model with the highest coincidence rate As the training image of multi-point geostatistical modeling, the seismic attributes are selected as the soft constraints of the training image to establish multiple realization models again, and the realization model with the highest coincidence rate is selected as the braided river sedimentary faci...

Embodiment 3

[0045] On the basis of embodiment 1, the braided river sedimentary heterogeneous tight sandstone gas reservoir geological modeling method as claimed in claim 1, said step 1) establishes the internal structure model of the braided river reservoir, and the specific steps are: Utilize the seismic data and drilling and logging data of the braided river reservoir for time-domain seismic-tectonic cross-section interpretation, well-seismic combined stratigraphic correlation cross-section closure, and realize the three-dimensional closure correction of the cross-section, and the three-dimensional closure correction combined with well-seismic Calibrate the obtained well point time-depth relationship and time-domain seismic structure calculation layer velocity to establish a velocity model, and then convert the time-depth relationship to obtain the depth-domain geological structure, and use the depth-domain geological structure to establish a structural model framework under Petrel softwa...

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Abstract

The invention belongs to the technical field of oil and gas field reservoir geological analysis, in particular to a braided river sedimentary heterogeneous tight sandstone gas reservoir geological modeling method comprising the following steps: establishing a braided river reservoir internal structure model; establishing a braided river reservoir geological knowledge base; and taking the braided river reservoir internal structure model as a framework, applying the stochastic modeling method based on the target, inputting the parameters of the braided river reservoir geological knowledge base,establishing multiple implementation models and selecting the implementation model with the highest coincidence rate as the training image of multi-point geostatistical modeling, and selecting seismicattributes as the soft constraint conditions of the training image to establish multiple implementation models again and selecting the implementation model with the highest coincidence rate as the braided river sedimentary facies model. The problem of low average coincidence rate of establishing the geological model in the prior art can be solved, and the existing mine field data are fully integrated and the coincidence rate of the established geological model can be enhanced.

Description

technical field [0001] The invention belongs to the technical field of geological analysis of oil and gas field reservoirs, and in particular relates to a geological modeling method for heterogeneous tight sandstone gas reservoirs deposited in braided rivers. Background technique [0002] Tight sandstone gas reservoirs are currently one of the unconventional energy sources that replace conventional gas reservoirs for sustainable development. Gas reservoirs are characterized by low porosity, low permeability and low abundance, resulting in the development costs of such gas reservoirs being often higher than those of conventional gas reservoirs. In order to reduce risks, ensure benefits, and improve economics, it is necessary to improve the reliability of gas reservoir characterization and guide production capacity construction and economic evaluation. To characterize this type of reservoir, 3D seismic is mainly used in foreign countries, and the structures and target volumes ...

Claims

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Application Information

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IPC IPC(8): G01V1/36G01V1/28
CPCG01V1/282G01V1/36
Inventor 付斌马志欣李进步张吉李浮萍朱亚军王文胜杨特波张晨史红然王树慧王龙
Owner PETROCHINA CO LTD
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