A NEW METHOD FOR SEQUENCE STRATIGRAPHY——STRUCTURE- SEQUENCE RESEARCH

Structure-sequence stratigraphy is a new method for sequence stratigraphy, which is based on the theory that structure is one of the main factors controlling sequence development, distribution and conservation of sedimentary facies. At different periods of presedimentary, synsedimentary and postsedimentary, the controlling patterns of structures on sequence development change: pre-sedimentary structures control the initial topography and residual accommodation of earlier period, synsedimentary structures control the new-gained accommodation, while post-sedimentary structures control the conservation of deposits. In research on sequence and sedimentary systems, especially on those strata of old age and undergoing multi-cycle tectonic transforms, influences of structures on sequence development and conservation should be considered adequately. Based on the analysis of tectonic and basin forming evolution, the study of sequence development and sedimentary facies evolution can not only embody inherent relation between structures and sequence evolution, but also the spatial collocation of structures with the distribution of strata and sedimentary facies. Structure-sequence research urges the tight combination of sequence research with the evaluation of reservoir, source rock and trap, and carries better application of sequence stratigraphy in hydrocarbon exploration.