Sequence stratigraphy of the Carboniferous in Tazhong and Manxi areas of Tarim Basin

Using the seismic data, drilling, well-logging and well core, combined with the analysis data, the carboniferous are divided into three seismic sequences and six sedimentary sequences. The sequence (CⅠ) and (CⅡ) are the typeⅠsequence, while the CⅢ to CⅥ are the type Ⅱ sequence. By comparison with the standard typeⅠsequence, the LST of typeⅠsequence in the areas are characterized with the river deposit, and lack of the deep water deposition system such as basin floor fans and slope transgress complex. In the type Ⅱ sequences, the SMST are not well-developed, and the main deposit systems are the shallow water carbonate deposit and the sea margin plain deposit. The sequences that formed in the early Carboniferous are on the uneven erosion surface, and the main deposition style is that of filling the surface; while during the middle and latter Carboniferous, the sequences are formed in the broad and even basin. This kind of sequence framework is different from the classic one that derived from the passive continental margin, and reflects the sequence that is developed in the depression basin of the stable platform.