Sequence Stratigraphy Styles And Its Response To Structure Activity In Jurassic In Bohu Depression, Yanqi Basin

By outcrops, cores observing and seismic data interpreting detailedly, and based on sequence stratigraphy and sedimentary system analyzing. Sequence stratigraphy framework is established. The styles of Sedimentary system, sedimentary facies and micro-facies are identified. Sequence stratigraphy architecture is studied by sequence and sedimentary comparing in wells. And at last, the characteristics of the relationship between sediment, sequence and structure activity are discussed in Jurassic in Bohu depression, Yanqi basin.The thesis is divided into several parts:The purposes and significances of the thesis are discussed in the first chapter. In the first chapter, the present state and perspectives of sequence stratigraphy and the relationship between sediment, sequence and structure activity are introduced. And the research idea and methods be adopted in the thesis are proposed. The research ideas include the identifying of sequence boundary, the establishing of high resolution sequence stratigraphy framework, the analyzing of sedimentary system. And by comparing the characteristics of each sequence unit and sedimentary system, the relationship between sediment, sequence and structure activity are summarized. The methods are "point—line—plane—evolvement" and "structure activity—sediment, sequence".The geology setting of Yanqi basin is introduced in the second chapter. Yanqi basin is located on the Kuluke fold belt and south Tianshan fold belt in geological setting. And it is located among the Tarim, Junggar and Turpan-hami basin in geographical setting. Yanqi basin is an intermontane basin. There is Huola mountain in the west, Kezile and Tongkuang mountain in the east, south Tanshan mountain in the north and Kuluke mountain in the south of the basin. There is a tectonic framework of "depression-uplift-depression" in basin. From north to south, they are Hejing depression, Yanqi uplift and Bohu depression. Its evolvement includes several phases. Mesozoic: foreland basin in Triassic, depression basin(extension) in Jurassic. Denudating in Cretaceous;...