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Shale gas reservoir seismic prediction method

A technology for earthquake prediction and shale gas, which is applied in seismic signal processing and other directions, can solve the problems of large measurement errors and achieve the effect of small measurement errors and improved accuracy

Inactive Publication Date: 2016-07-27
CHENGDU CHUANGYUAN OIL & GAS TECH DEV
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AI Technical Summary

Problems solved by technology

Existing seismic surveys of shale gas reservoirs have the defect of large measurement errors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0015] The present invention includes an earthquake prediction method for shale gas reservoirs, comprising the following steps:

[0016] Step A) Using the wave impedance inversion technology to realize the spatial distribution prediction of the shale interval; to adapt to the measurement of the obvious difference in wave impedance between the shale interval and the upper and lower surrounding rocks.

[0017] Step B) Analyze the TOC sensitive parameters of shale total organic carbon based on the spatial distribution prediction, clarify the TOC sensitive parameters and establish a mathematical model between them and the TOC content of shale total organic carbon; only the total organic carbon of shale Shale gas reservoirs with industrial value can only be obtained when the average content of TOC reaches a certain threshold value. The existing standard for TOC is that the average value of TOC is greater than or equal to 1%. At present, the evaluation of TOC is mainly based on well...

Embodiment 2

[0021] This implementation example is preferably as follows on the basis of Embodiment 1: In step A), the constrained sparse pulse inversion method in the wave impedance inversion technology is used. This method not only has the characteristics of the general recursive inversion method, the inversion result is faithful to the seismic data, and can reflect the lateral change of the reservoir, but also introduces geological and logging data to participate in the inversion constraint in the iterative process, adding some low-frequency and High-frequency components broaden the inversion frequency band.

[0022] In step B), the resistivity-porosity overlay method is used for sensitive parameter analysis. The results measured by this method are more accurate.

[0023] The analysis of TOC sensitive parameters of shale total organic carbon in step B) includes conventional logging curves and results of pairwise intersection analysis of elastic parameters and logging interpretation TOC...

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Abstract

The invention discloses an earthquake prediction method for shale gas reservoirs, which comprises the following steps: step A) using wave impedance inversion technology to realize the spatial distribution prediction of shale intervals; step B) performing page prediction based on the spatial distribution prediction Analyze TOC sensitive parameters of rock total organic carbon, clarify TOC sensitive parameters and establish a mathematical model between them and TOC content of shale total organic carbon; step C) based on 3D seismic data, under the spatial constraints of wave impedance inversion of shale intervals , using the pre-stack inversion method to obtain the sensitive parameter body; step D) according to the mathematical model, convert the sensitive parameter body into a shale TOC data body, and obtain the research data from the shale TOC TOC inversion data body The spatial distribution of shale gas reservoirs in the study area can be predicted quantitatively, and the seismic prediction results can be obtained. The invention adopts the above method, the earthquake prediction method has small measurement error and greatly improves the accuracy.

Description

technical field [0001] The invention relates to the geological field, in particular to an earthquake prediction method for shale gas reservoirs. Background technique [0002] Shale gas is natural gas extracted from shale formations. The main body is located in dark mud shale or high-carbon mud shale. Shale gas mainly exists in mudstone, high-carbon mudstone, shale and silt in an adsorbed or free state. Natural gas in sandy rock interlayers, which can be generated in various stages of organic origin. On the main body of natural gas, it exists in fractures, voids and other storage spaces in a free phase state (about 50%), and in an adsorbed state (about 50%) Exist on the surface of knuckle root, clay particles and voids, and a very small amount is stored in dry knuckle root, asphaltene and oil in a dissolved state. Natural gas also exists in interlayered siltstone, silty mudstone, argillaceous siltstone, and even sandstone After natural gas is generated in the strata, the nea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/30
Inventor 刘欢金涛
Owner CHENGDU CHUANGYUAN OIL & GAS TECH DEV
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