The Sequence Stratigraphy And Sedimentologic Characterristics Of Lacustrine Carbonate In The Upper 4th Member Of Shahejie Formation, Luojia Area Of Zhanhua Depression

On the basis of High-resolution Sequence Stratigraphy and modern sedimentology, also the comprehensive analysis of the cores, slice, geophycial logs and seismic investigation, the Lacustrine carbonate complex in the Upper 4th Member of Shahejie Formation, Luojia Area, Zhanhua depression are studied.Applyin high-resolution sequence stratigraphy theory, using cores, slice, geophycial logs and seismic data, the Upper 4th Member of Shahejie Formation was divided into 3 fourth-order cycles. The frame structure was built up on the basis of the well correlations.The lacustrine carbonate of the Upper 4th Member of Shahejie Formation in the study area main development in the declined period of the third-order cycle. The platform bioclast and algal reef were developed on the steep hill, shallow-water platform limestone or mixed accumulate rock were developed on the gentle slope area, and the sub-sag center was mainly constituted by mudstone and creamingmudstone. Through the use of quantitative paleogeographic recovery method, confirmed the distribution rule of the sedimentary system. In the Upper 4th Member of Shahejie Formation period, the area adjoin the Chenjiazhuang bulge develop the small-scale fan delta and delta depositional system. Toward to the center of the subbasin, developed lime-mudflat and gypsum ordinally.Through studing the distribution of the sedimentary system, the paper set up the depositional model and controlling factors. The developed carbonate was mainly controlled by paleotopography, paleo water depth, hydrodynamic conditions, ancient climate and source supply. Particularly the paleotopography controlled by tectonic play a key control function to the development of the carbonate sedimentary facies and reservoir. The varies of the paleotopography and the slow of the slope also controlled the deposition of carbonate. Meanwhile in the carbonate deposition process, the effect of the tectonic movement and fracture could cause further changes,resulting in sedimentary environment of the chage, eventually leading to the changes of sediment types.