关键词: 塔里木盆地, 罗布泊, 石炭纪, 地层层序, 沉积模式, 沉积相, 油气远景

Abstract: The field outcrop section of Carboniferous in norther Luobubo seg of Tarim basin was measured in detail. And the formation horizon was classified and correlated based on the paleontological feature, lithological and petrographic analyses and stratigraphic correlation. It is confirmed from seismic trace and Luobei section connected to areal coverage that there exists Carboniferous sequence distributed within the areal coverage. The integrated characteristic analyses of paleontology, lithology and lithofacies as well as grain size suggest that a mixed sedimentary sequence with interbedded typical shallow offshore clastic rock and platformal carbonate rock of Carboniferous is vertically developed in this area, providing the facies model suitable to this sequence. Based on this model, an analysis of sedimentary facies on this section is made, followed by simple evaluation of its lithofacies palaeogeography. The results show that in this typical sedimentary sequence, hydrocarbon source rocks and reservoir are fairly developed, which have great signifcance in petroleum geology; their probably favorable source-reservoir-cap assemblages mean better hydrocarbon potentials in this area.

Key words: Tarim basin, Luobubo sag, Carboniferous, stratigraphic sequence, sedimentary pattern, sedimentary facies, hydrocarbon potential