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- Title
渤海湾盆地渤东凹陷次级洼陷差异演化特征.
- Authors
李坤; 董柔; 江涛; 黄镜嘉; 徐国盛
- Abstract
Based on the 3D seismic interpretation of Bodong Sag, Bohai Bay Basin the structural characteristics of secondary depressions and the differential evolution of depression-controlled faults are discussed by using the methods of structural section restoration. The study shows that there are six sub-depressions in the Bodong Sag, and the sag structure from north to south shows the differential deformation law of single fault and half graben area, half graben-graben transition area and asymmetric double fault graben area. There are three types (extensional, strike-slip and superimposed) and three groups (NNE, NE and NW-trending) faults in Bodong Sag. The NNE-NE extensional faults are mainly dry-controlled depression faults, while the NW-trending extensional faults are small in scale and cut into depressions. In the early stage of strike-slip faults, the extensional nature of controlled deposition is localized, and the distribution pattern of strike-slip reformed strata is strong in the late stage. The evolution process of paleogene sub-depressions can be divided into four stages: the sedimentary period of the 4th Member of Shahejie Formation-Kongdian Formation is the initial fault depression stage, the NE extending fault is the main control, and the NW fault cuts the depression, showing the characteristics of “north and south zone”, and the depositional center is located in the northeast. The sedimentary period of the third Member of Shahejie Formation was a stage of strong fault depression. The NNE extensional fault became the main control and the NW fault weakened. The sedimentary stage of the 1st and 2nd Members of Shahejie Formation is thermal subsidence stage, and the NNE extension fault is still the main control. The sedimentary period of the third Member of Dongying Formation is the strengthening period of fault depression, and the NNE main control faults are actively active, showing the characteristics of “east-west zonation”, and the depositional center has moved to the southwest.
- Subjects
GEOLOGICAL basins; DIFFERENTIAL evolution; LAND subsidence; MENTAL depression; DEFORMATIONS (Mechanics); PALEOGENE
- Publication
Natural Gas Geoscience, 2022, Vol 33, Issue 6, p967
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2022.01.019