| Seismic sedimentology is an interdisciplinary subject which bases on the geophysics, sedimentology, seismic stratigraphy, sequence stratigraphy and so on. The main research idea is that the guidance under the guidance of geological model, using 3D seismic information and modern geophysical technology to carry on the macroscopic research of formation rock and the research of lateral distribution and evolutionary history of sedimentary facies. With the development of geophysical techniques and serious requirement of subtle reservoir exploration, the application of seismic technology has becomes common.The study area is Zhen Wu west-ShaoBo area in JiangSu oilfield. Combined with sedimentary background of study block, based on the data of core, well logging and seismic, isochronous stratigraphic division of Dainan group was studied. On the basis of well data analysis, using the principle of sequence stratigraphy combined with frequency-shared interpretation, spectrum decomposition technique divides the short-term cycle, which is equal to four sequences of the sand group level. Within the isochronous stratigraphic framework, according to the geological characteristics of different layers, methods of seismic sedimentology(strata slice, 90° phase transformation, frequency-shared interpretation) and reservoir seismic(seismic attribute analysis, seismic facies analysis) were used to study sedimentary micro-facies. The underwater distributary channel, river edge and sheet sand micro-facies were identified. Due to the existence of multiple solutions of seismic data, a variety of methods should be used in the analysis of sedimentary facies, achieving mutual verification, in order to improve the precision and accuracy of research.The sand distribution of sedimentary units in the study area was obtained by conducting seismic sedimentology research, which will provide reference for the further exploration and development of the oilfield. |
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