Based on 3D seismic and borehold data,seven seismic sequence boundaries and seven drilling sequence boundaries are identified in the Carboniferous carbonate platform of North Troyes Oilfield. The KT-I reservoir group is divided into three and a half third-order sequences,and the KT-Ⅱ reservoir group is divided into three third-order sequences. The sedimentary environment evolved stratigraphically from open platform,through restricted platform,to evaporative platform. According to the palaeo-geomorphic restoration and sedimentary evolution within the sequence framework of the study area,the palaeogeomorphic and sedimentary evolution of the study area can be divided into three stages: the initial phase of differential platform uplift and depression(SQ2-SQ3 sequence),the finalizing phase of differential uplift and sedimentary differentiation fixing period(SQ4 sequence),and the inherited development phase(SQ5-SQ7 sequence). Further analysis shows that the uplift and depression pattern under the control of sequence framework controls the plan-view distribution of dolomite subclasses. The lower part of the sequences are dominated by micritic dolomite-gypsum and micritic dolomite-micritic limestone assemblages,which are characteristic of mainly lagoonal lacustrine deposits,while the higher part of the sequences are dominated by micritic dolomites,fine micritic dolomites and residual micritic dolomites.The results show that deposition of the KT-I oil formation in the study area results from inherited differential subsidence,rather than erosion and subsidence of the “western highland and eastern lowland”as previously thought. The overall palaeogeographical pattern is characterized by “Platform in the east,trough in the west,high in the north and low in the south”,which consistently controls the development and distribution of favorable facies and high-quality reservoirs. This finding is vitally important in screening for hydrocarbon exploration and production prospects in Pre-Caspian Basin.