Abstract:

The Keshang Formation, middle Triassic, Wuerhe oilfield is a set of fan delta sedimentary facies, with the characteristics of near source areas, low maturity, unclear vertical and horizontal distribution of reservoirs, server heterogeneity. The research is done on isochronal formation classification and correlation, microstructure and microsedimentary facies analysis, fine interpretation of reservoir parameters, characteristic description of spacetime distribution of reservoir phsical property, isochronal formation frame based on supper short period and formation plane microstructure model based on single sandbody are established. The vertical and horozontal distribution of microsedimentary facies within single sandbody is clarified, and on the basis of which, the spacial distribution of effective accumulation permeable bodies and the phsical property heterogeneity is described, a set of technologies suitable for fine description of complex fan delta sedimentary reservoirs is developed, which provides technological support for resonable exploitation of the types of reservoirs.

Key words: Wuerhe Oilfield, FanDelta, reservoir characterization, subsurface correlation, microfacies analysis