关键词: 塔里木盆地, 层序地层, 低位体系域, 有利储层, 志留系, 泥盆系

Abstract: The seismic,drilling,well logging and outcrop data were used to recognize sequence stratigraphy of Silurian-Devonian systems Ten tertiary sequences and four secondary sequences were divided.The tertiary sequences of Sq1,Sq4,Sq8 and Sq10 belong to the type-Ⅰ sequence,while the others are the type-Ⅱ sequence.The type-Ⅰ sequence in the basin was characterized by the seashore-inter shelf deposition system.Comparison with the classical type-Ⅰ sequence,the lowstand system tract(LST) of the type-Ⅰ sequence in this basin was lack of the deposition systems such as basin floor fans and slope transgress complex system.The type-Ⅱ sequence was characterized by the main deposited systems such as the coastal(tidal flat) and shelf deposition.The sequences formed in the Early Silurian were generated on the uneven erosion surface.The main deposition filled the surface.During the Middle and Late Silurian,the sequences formed in the broad and even basin.During the end of the SilurianDevonian period,the basin was in extrusion state and turned up a large-scale uplift.During the end of the Devonian and the early Carboniferous,sea water was invaded again,a new transgress overlap was turned up,and a set of Donghe sandstone was widespread.This kind of sequence framework is different from the classical one that derived from the passive continental margin and reflects the sequence characteristics of the depression basin in the stable platform.The lowstand system tracts of Sq1,Sq4 and Sq10 are the favorable exploratory sequences in the Silurian-Devonian systems of Tarim Basin.

Key words: Tarim Basin, sequence stratigraphy, lowstand system tract, favorable reservoir, Silurian, Devonian