## 6 Conclusions  
1. Supercritical multi-source, multi-component thermal fluid offers the advantages of high temperature, high dryness, and a high heating utilization rate. And supercritical fluid technology can economically and efficiently treat organic waste liquid, making it highly applicable in offshore heavy oil exploitation and environ-mental governance with great prospects for application.
2. A numerical simulation model considering four groups of seven components was established, and the simulation accuracy was over 95%. Based on the fitted numerical simulation model of supercritical fluid reservoir, the evaluation of the main control factors under different injection parameters of single sand reservoir was carried out, and the influence degree chart of the main control factors under the influence of static and dynamic parameters was established by using the single well cumulative oil production method.
3. Through orthogonal test and numerical simulation, the sequencing of main controlling factors affecting the development of supercritical multi-source multi-component thermal fluids in heavy oil offshore was clarified, and the influencing chart of gas channeling degree and the suggested chart of gas channeling control measures were established.
4. The application potential of 670 million tons of heavy oil reserves in the Bohai oil field was sorted based on oil production evaluation, oil increase evaluation and adaptive screening standard methods, and the reserves suitable for supercritical technology reached 280 million tons. Taking KL 10-2 oilfield as an example, after replacing  
Figure 13: Section diagram of predicted production by supercritical technology in experimental oilfield.  
the traditional steam boiler with supercritical technology, the residual production increased by 404,000 cubic meters and the recovery rate increased by 1.8%, which verified the great potential of this technology in the overall promotion of offshore.  
**Author Contributions:** As the first author, [PERSON] wrote the main manuscript text. [PERSON] and [PERSON] are the main authors of the review and completed the collection and analysis of the relevant literature. [PERSON], [PERSON], and [PERSON] participated in the analysis and sorting of the literature materials and contributed to the review and editing of this work. As the corresponding author, [PERSON] made substantial contributions to the conception/design of the work and approved the final version to be published. All authors have read and agreed to the published version of the manuscript.  
**Funding:** The authors declare that this study received funding from the \"14 th Five-Year\" major science and Technology Project (Effective Development Technology of Offshore Heavy Oil Thermal Recovery) of China National Offshore Oil Co., Ltd.  
**Institutional Review Board Statement:** Not applicable.  
**Informed Consent Statement:** Not applicable.  
**Data Availability Statement:** The original contributions presented in the study are included in the article, further inquiries can be directed to the corresponding author.  
**Acknowledgments:** The authors would like to thank the research team members for their contributions to this work.  
**Conflicts of Interest:** [PERSON] was employed by the company CNOOC Research Institute Co., Ltd (Beijing China). The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.