Seismic Sedimentology Research Of The Lower Part Of The Second Member Of The Shahejie Formation,eastern-north Dongying Depression,X16 Fault Block,Bohai Bay Basin,China

The main objective of this article is to demonstrate the utility of stratal slice images for exploring the sequence stratigraphy and sedimentology of complex depositional systems.The Dongying Depression is underlain by a productive,petroleum-prone,non-marine Cenozoic stratigraphic section.Here we have integrated the recent 3D seismic profiles and borehole data to map sediment dispersal characteristics of the lower part of the second member of the Shahejie Formation in the eastern-north Dongying Depression,X16 fault block,located in the Bohai Bay Basin,China.We have documented the following key points:(i)the main strata under study area is divided into one seven fourth-order sequences;(ii)three microfacies,mouth bar,underwater distributary channel and tributary bay,are identified from well-based analysis of sedimentary facies;(iii)the mouth bar is generated at the center of the study area,and the channel is distributed along the EW direction;(iv)the RMS attributed graph is useful to map the distribution of target layer during the second member of the Shahejie Formation.From the lower part of the second member of the Shahejie Formation to the upper part,the net-to-gross and sandstone thickness are obviously decreasing;(v)the delta is generated under the high-accommodation stage.The seismic sedimentological study on this study area highlights the distribution of the micro-facies,which is critical for the next step.