期刊
MARINE AND PETROLEUM GEOLOGY
卷 109, 期 -, 页码 658-674出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marpetgeo.2019.06.052
关键词
Strike-slip structure; Releasing bend; Petroleum accumulation; Tan-Lu fault zone; Bohai Bay Basin
资金
- National Natural Science Foundation of China, China [41690134, 41602150]
- National Science & Technology Specific Project, China [2016ZX05024-003-008]
- Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan), China [CUGL 170219]
- Tianjin Branch of China National Offshore Oil Company (CNOOC) Ltd.
The Penglai 7-6 (PL7-6) structure is located on the Tan-Lu fault zone, a huge fault zone in east Asia. Tectonism of the Tan-Lu fault zone produced complex structural deformation and was an important factor in petroleum accumulation. Three-dimensional seismic data were employed to document the structural geometry and evolutionary process of the PL7-6 structure, and implications for petroleum exploration in a releasing bend of a strikeslip fault system were discussed. Systematic analysis of the seismic data indicates that the main fault (the BD2 fault) of the Tan-Lu fault system slipped right-laterally during the Cenozoic. Strike-slip movement of the BD2 fault peaked during deposition of E(1-2)k to E(3)d(3), and decreased largely in intensity during E(3)d(1-2) deposition. In the Neogene and Quaternary, the BD2 fault was reactivated. Formation of the Bodongnan low uplift is related to the connection between the Bodongnan low uplift (N) and Bodongnan low uplift (S). The Bodongnan low uplift (N) is represented by an anticline produced by strike-slip movement of the BD2 fault, and the Bodongnan low uplift (S) is represented by the relatively uplifted strata in the vicinity of an extensional fault (the BD3 fault). The PL7-6 structure developed above a releasing bend formed by the subsequent strike-slip movement of the curved BD3 fault. Orientations of the shallow faults in the PL7-6 structure are not only associated with the lower BD3 fault, but also controlled by the basement high. Unlike traditional releasing bends that are generally disadvantage to petroleum accumulation due to the lower structural elevation in the center, the releasing bend in the PL7-6 structure is favorable for petroleum accumulation because of the three reasons: (1) adjacent to generative kitchens, (2) located on a regional structural high, and (3) served by the releasing-bend-related faults acting as conduits for vertical petroleum migration.
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