A certain basin is located within the mainland and has complex geological structures and abundant oil and gas resources. The basin has obtained a large amount of geological data through multiple drilling projects and seismic exploration.

The basin was formed during the Mesozoic to Cenozoic periods and has a complex tectonic evolution history. The interior of the basin is mainly composed of sedimentary rock layers, including sandstone, mudstone, limestone, etc. The main strata include the Upper Cretaceous, Tertiary, and Quaternary. The internal structure of the basin is complex, including multiple faults and folds.

The sedimentary environment of the basin is diverse, including fluvial, lacustrine, and marine sediments. Reservoirs formed under different sedimentary environments have different reservoir characteristics. Riverine sediments usually have good reservoir properties, while lacustrine and marine sediments may have higher mud content and poorer reservoir properties.

1. Source rock : The main source rock in the basin is the Upper Cretaceous mudstone, which has a high organic matter content and great potential for oil generation.

2. Reservoir : The main reservoir is the tertiary sandstone, which has good porosity and permeability.

3. Cover layer : The main cover layers are Upper Cretaceous mudstone and Tertiary mudstone, which have good sealing properties.

4. Trap types : including structural traps and stratigraphic traps. Structural traps are mainly formed by faults and folds, while stratigraphic traps are formed by unconformities and lithological changes.

5. Oil and gas migration: After oil and gas are generated from source rocks, they migrate through faults and sandstone reservoirs and accumulate in traps.

Through seismic exploration, a structural map and reservoir distribution map of the basin were drawn. Seismic data shows the presence of multiple favorable structural and stratigraphic traps within the basin, providing important evidence for oil and gas exploration.

The results of seismic exploration were verified through drilling, and commercial oil and gas flows were obtained from multiple well locations, confirming the abundant oil and gas resources in the basin.

The oil and gas accumulation conditions in the basin are superior and have good exploration prospects. Through comprehensive geological research, seismic exploration, and drilling verification, oil and gas resources in the basin can be effectively evaluated and developed.