Ba Ngoc, T. and Loan Anh, N.N. 2025. Depositional Environment and Petroleum System Significance of Shale- And Siltstone-Dominated Source Rocks: Evidence from Well A-1X, Nam Con Son Basin, Offshore Vietnam. Engineering And Technology Journal. 10, 10 (Oct. 2025), 7600–7608. DOI:https://doi.org/10.47191/etj/v10i10.33.