| Devonian marine source-reservoir-seal assemblage developed in Songpan area, the prospect of hydrocarbon exploration is good, it is one of the most potential petroliferous basins in west China. Based on predecessor’s achievements, guided by the theory of tectonic, sedimentology, sequence stratigraphy, based on study of backbone section and auxiliary section, combined with macro observation and indoor micro analysis, sedimentary system, sequence stratigraphy, paleogeographic and sequence framework were studied in this area.(1) Combined with local sedimentary setting, based on integrative analysis of outcrop, lithology, sedimentary structure, fossil assemblage and rock section analysis, the Devonian in Songpan area can be divided into 3 sedimentary facies, further into 6 subfacies and several microfacies.(2) Based on the analysis of the facies sequence composition and carbonatite meter-scale-cycle cycle,40third-level s were identified after the sedimentary cycle dividing of backbone section,then the Devonian in Songpan area can bedivided into 18 third-level sequence.(3) Based on 2 measured section and 6 collected section,the characteristics of stratigraphic correlation development was researched,also sequence correlation framework was established.(4) Through the regional stratigraphic correlation, the spatial and temporal variation of main sedimentary system in the songpan area devonian was discussed, in the south of BaiLongJiang uplift, the devonian sequences were complete, in the north , Lower Devonian sequences were absent, Lower Devonian sequences appeared vestigial.(5) Based on study of sedimentary system and sequence stratigraphy, according to the drawing method of tectonic litho-paleogeographic, taking tectonic sequence as compilation unit, 3 tectonic litho-paleogeographic map were drew, which manifest sedimentary framework of different stage of Devonian in study area. |
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