THE UPPER PALEOZOIC SEQUENCE STRATIGRAPHIC AND SEDIMENTARY SYSTEM CHARACTERISTICS OF THE SOUTHWEST ORDOS BASIN

Guided by the theories of modern sedimentology and sequence stratigraphy, comprehensively using the outcrop, drilling, logging and seismic data and based on the boundary characteristics of the sequence system domains, the Upper Carboniferous-Permian strata of the study area were divided into three sedimentary sequences. The development information of the lowstand, transgressive and highstand system domains was ascertained, and the characteristics and distribution of seamarsh, river, delta, shore shallow-lake and beach dam these five sedimentary systems were indicated. At last, the favorable developing sequences of source rocks, reservoirs and covers and areas for exploration were suggested.