地应力地震预测及其在南川页岩气开发中的应用

doi:10.11720/wtyht.2021.1102

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Abstract

Shale gas reservoirs have the characteristics of low porosity and low permeability.The large-scale exploitation of shale gas requires the reconstruction of shale reservoirs through horizontal well fracturing technology.Available data indicate that,when the horizontal shale gas well azimuth is approximately perpendicular to the maximum horizontal principal stress,and the coefficient of difference in horizontal in-situ stress is small,it is favorable for fracturing to form network fractures and improve the effect of reservoir reconstruction.An in-situ stress prediction model was established for the Nanchuan area.On the basis of detailed 3D seismic interpretation and 3D seismic prestack inversion,the regional adaptive parameters were selected by using well data simulation,and the 3D simulation of the in-situ stress field was performed to predict the direction of the maximum horizontal principal stress,the direction of the minimum horizontal principal stress and the coefficient of in-situ stress difference.Through an analysis of the regional stress mechanism and the interpretation of the induced joint and the analysis of the application,the reliability of the in-situ seismic prediction results was verified,and the important role of in-situ stress analysis in shale gas development was proved.

Key words： 3D seismic survey shale gas in-situ stress DHSR fracturing

Received: 04 March 2020 Published: 27 July 2021

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Hao-Juan LIU. The application of in-situ stress prediction based on seismic data to shale gas development:A case study of Nanchuan(south Sichuan) area[J]. Geophysical and Geochemical Exploration, 2021, 45(3): 560-568.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1102 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I3/560

In-situ stress prediction process

Formation pressure prediction based on Eaton method
a—normal compaction trend line of W3;b—measured pressure point and predicted pressure curve of W3

Reflection structural characteristics in O₃w of Nanchuan area

Faults and maximum horizontal principal stress direction in O₃w of Nanchuan area

Comparison of FMI interpretation results and 3D prediction of horizontal maximum principal stress direction in O₃_w of Nanchuan area

Maximum horizontal principal stress in O₃w of Nanchuan area

FMI interpretation results and 3D prediction of horizontal maximum principal stress in O₃w of Nanchuan area

FMI interpretation results and 3D prediction of horizontal minimum principal stress in O₃w of Nanchuan area

Differential horizontal stress ratio in O₃w of Nanchuan area

The effect of horizontal well orientation on productivity

Relationship between orizontal well orientation and fracture pressure

The effect of horizontal stress on sand proportion

The effect of horizontal stress on productivity

Relationship between horizontal stress difference ratio and gas production of each well

Relationship between horizontal stress difference ratio and gas production in each fracturing interval of wells

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