• Origins and formation mechanisms of petroleum are framed by time-depth relations, phase transitions, and biomarker patterns, connecting generation to source beds and sedimentary records [1], [4], [11], [13], [15], [16], [17].

• Microbial utilization and biodegradation of crude oil in marine systems reveal natural attenuation pathways, microbial communities, and nutrient limitations (N, P) across coastal and low-temperature environments [2], [3], [7], [9], [10], [18], [20].

• Analytical petroleomics and biomarker-based methods yield molecular fingerprints for origin and maturation, using high-resolution mass spectrometry, isoprenoids, n-paraffins, and fatty acid roles [5], [13], [15], [16], [17], [19].

• Geological framing of petroleum origin with migration pathways, reservoir alteration, and regional evolution, integrating source-bed concepts and exploration-scale sedimentology [6], [8], [11], [12].