## 6 Conclusions  
Based on the molecular geochemical correlations of source rocks, reservoir and inclusion oils, multivariate statistical analysis (HCA, PCA), and basin modeling, the sources of hydrocarbon in the northern Kuqa Foreland Basin can be summarized as follows.  
(1) A Jurassic coaly source rock and a Triassic lacustrine source rock are identified in the northern Kuqa Foreland Basin, with their relative contribution to the Dibei Gas Field evolving over time;  
(2) Geochemistry, multivariate analysis, and basin modeling results for both reservoir oils and inclusion oils indicate multiple sources of oils in the Dibei area. The early-charged oils recorded by oil inclusions were mainly generated from the Triassic lacustrine source rocks, with slight differences between J\({}_{1}y\) and J\({}_{1}a\) formations. The inclusion oils in the J\({}_{1}y\) reservoirs were generated mainly by the Triassic lacustrine source rocks but with minor Jurassic coaly input; whereas, the inclusion oils of the J\({}_{1}a\) reservoirs were generated mainly from the Triassic lacustrine source rocks. In contrast, the present reservoir oils show a significant input from the Jurassic sources. The difference between reservoir oils and inclusion oils shows a switching in oil-sources;  
(3) At \(\sim\)23.3 Ma, the low-mature oils were mainly originated from the Triassic source rocks. From 23.3 Ma to 12 Ma, oil-sources gradually changed from the Triassic source rocks to the Jurassic source rocks due to a rapid burial, which caused all the source rocks to reach the oil generation window. At \(\sim\)5 Ma, most oil and gas were generated mainly from the Jurassic source rocks. The Jurassic coaly source rocks become the main sources of the accumulated condensate gas in the study area. This finding enables prospective exploration areas to be delineated according to the spatial distribution of the Jurassic sources.  
Conceptualization, X.W., K.L., J.L. and L.Z.; Data curation, X.W., L.Z. and X.D.; Formal analysis, X.W. and K.L.; Funding acquisition, K.L., X.Y., J.L., L.Z. and X.D.; Investigation, X.W. and X.D.; Methodology, X.W., K.L. and J.L.; Project administration, X.Y. and L.Z.; Resources, K.L. and X.Y.; Software, J.L.; Supervision, K.L.; Validation, X.W., K.L., X.Y. and X.D.; Visualization, J.L.; Writing--original draft, X.W.; Writing--review and editing, K.L. All authors have read and agreed to the published version of the manuscript.  
This research was funded by the Major Research Project on the Tethys Geodynamic System of the National Natural Science Foundation of China (No. 92055204), NSFC Innovation Group (No. 41821002), and PetroChina Major Research Program on Deep Petroleum System in the Tarim Basin (No. ZD2019-183-01-004). The Tarim Oilfield Company, PetroChina is thanked for providing their inhouse data used in this paper.  
Not applicable.  
The data presented in this study are available on request from the corresponding author. The data are not publicly available due to privacy.  
**Conflicts of Interest:** Author [PERSON] and [PERSON] were employed by the PetroChina Tarim Oilfield Company. 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.