The spatial discrepancy of Miocene transgression and its corresponding channel transformation pattern: A case study of the carabobo region in the northeast Venezuela basin

摘要: Abstract The Eastern Venezuela Basin serves as a world-class petroliferous basin, with the sedimentary environment controlled by interactions between Caribbean and South American plates. This complex tectonic movement could have an important impact on unsynchronized evolution process heterogeneous marine transgression of different regions within basin. Thus, it is to clarify fluviatic- marine-deposits development environment, transition delta types, sand-body distribution this complicated movement. Based interpretation 3D seismic data, electrical well-logging facies analysis characteristics core, we were able identify association types understand evolutionary system study area. We found that differential in eastern western Carabobo block was caused uplift corresponding spatial discrepancy Middle Early Miocene foreland basins region. flat geomorphology contributed obvious sea level from North South, but center continuously blocked transgression. processes led blocks. In block, braided river deltas (23.3–20.43 Ma) gradually changed into meandering (20.43–15.97 Ma) finally tide-influenced estuaries (15.97 Ma). However, subsiding impacted area, (23.3–15.97 Ma) front (adjacent sea) quickly (15.97 Ma) generation distributary channels. relatively weak impacting area behind resulted channels being retained. Along tide-related deltaic channel began change one. After rebuilding paleo-hydrodynamic field, ancient geomorphology, combining hydrodynamic equations, quantitatively explain why sausage-shaped mouth bars occurred West isolated East. Differential related transgression, which rate intensity, direction water flow confluence, paleo-geomorphology.