Method for Determining Key Parameters of Anisotropic Rock Mechanics of Continental Shale Oil in Cangdong Sag
The member Ek2 continental shale oil in the Cangdong sag has currently entered the stage of beneficial development and pilot testing. In order to achieve economy of scale development, horizontal well drilling and completion large-scale volume fracturing technology are being comprehensively adopted....
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Well Logging Technology
2023-06-01
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| Series: | Cejing jishu |
| Subjects: | |
| Online Access: | https://www.cnpcwlt.com/#/digest?ArticleID=5487 |
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| Summary: | The member Ek2 continental shale oil in the Cangdong sag has currently entered the stage of beneficial development and pilot testing. In order to achieve economy of scale development, horizontal well drilling and completion large-scale volume fracturing technology are being comprehensively adopted. Accurate evaluation of rock mechanical parameters is crucial for hydraulic fracturing reconstructing of the member Ek2 continental shale oil in the Cangdong sag. A comparison has revealed significant differences in acoustic velocity between horizontal and vertical wells, limiting the application of homogeneous and isotropic rock mechanical parameter calculation methods in horizontal wells. To find a suitable calculation method for the rock mechanical parameters of the member Ek2 continental shale oil, a measurement plan for the anisotropic rock mechanical parameters of shale oil is designed. Measurement results show that the member Ek2 continental shale oil exhibits strong acoustic anisotropy. Through analysis, it is found that the development of laminations is the main reason for the strong acoustic anisotropy of the member Ek2 continental shale oil. Pressure, lithology, and organic carbon have a significant impacts on acoustic anisotropy, physical properties have certain influences, and oil content has a less pronounced influences. Based on core analysis, a method for characterizing the acoustic anisotropy and dynamic-static rock mechanical parameters of the member Ek2 continental shale oil is established. This method can provide accurate rock mechanical parameters for hydraulic fracturing reconstructing of shale oil in horizontal wells and has achieved good application results in practical use. |
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| ISSN: | 1004-1338 |