The main pathway of oil-gas long-distance and large-scale migration consists of two regionalunconformity interfaces, two detachment surfaces and two groups of faults.
两个区域不整合面、两个滑脱面、两组断裂是油气长距离、大规模运移的主要通道。
2
The principal fold age of the two "Indosinian geosynclines" is between the Middle and Late Eocene, which is marked by the regional flagrant unconformity below the Mengla Group and equivalent horizons.
Field surveys and seismic exploration show that the lowest regional angular unconformity older than the Carboniferous developed between the Cretaceous and the pre-Cretaceous strata.