Abstract:

The platform slope is concerned  because the lime-mud mound source and bank-reef facies reservoir are developed there and its development is controlled by the platform structure style.Basing on the comprehensive research of seismic, logging, core, and outcrop data, it is proposed that four types of carbonate platformis developed in Cambrian-Ordovician in Tarim basin, i.e. ramp carbonate platform, rimmed shelf carbonate platform, isolated carbonate platform and drowned carbonate platform. The structure style of carbonate platform has distinct diversities in different areas in the same phase and the slope distribution has migrated in different phases. The prograded ramp carbonate platform is developed in Cambrian in the central and northern Tarim basin, while the retrogradated wide gentle slope occurs in Cambrian in the southwestern Tarim basin. The retrogradated rimmed shelf carbonate platform is developed in Early Ordovician in the northern Tarim basin, while the aggraded rimmed shelf carbonate platform occurs in Early Ordovician in the southwestern and central Tarim basin.The platform slope is formed in Cambrian, distributes around the west platform, represents U shape toward west, and the platform slope is formed in Early-Middle Ordovician migrates toward platform. The integrity attributes of the slope in Later Ordovician is that the three platform slopes distribute around four islands. The existences of the platform slope of the southwestern and central Tarim basin and Tangnan area play an important role inreservoirevaluation and source predication in Tarim basin.

Key words: Tarim basin, carbonate rock platform, structure style, platform edge slope, development model, sedimentation, petroleum gas, carbonates