Yanshanian Tectonic Inversion and the Response of Sequence Stratigraphic Patterns in Eastern Yihezhuang Salient, Jiyang Depression, Bohai Bay Basin
Song Guangzeng
Xu Meng
Li Lei
Sun Di
Liu Hui
Abstract：Through boreholes, well logs and seismic profiles, one tectonic inversion happening between Middle Jurassic and Late Jurassic is recognized in Yanshanian eastern Yihezhuang salient based on analyzing unconformity surfaces, faulting activity and the negative structure of strata, which divides the Yanshanian of eastern Yihezhuang salient into Early Yanshanian and Late Yanshanian in this study.The sequence stratigraphic patterns of Early Yanshanian and Late Yanshanian are respectively established with analysis of single-well sequence stratigraphy and connecting-well sequence stratigraphy, which shows great differ-ence in sequence structure and internal makeup with each other.During early Yanshanian, the sequence stratigraphy showed unobvious thickness differentiation and the sequence-infill were fluvial facies.Differently, the sequence stratigraphy presented obvious thickness differentiation and was infilled mainly with fan deltas, as the tectonic inversion led to development of small rifted-basin, which showed obvious response to the recognized tectonic inversion.Applying tectonic-sequence stratigraphy to Yanshanian succession could contribute to the pre-Cenezoic hydrocarbon exploration of the basins with similar tectonic background in eastern China.
Keywords：Yanshaniantectonic unconformitytectonic inversionsequence stratigraphysedimentology
Publication Date：2019-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：15( 489-503 )