Reservoir Description Of Chang6~2-6~1in Zhangchaiyaozi Of Yongning Oil Filed

In order to clarify the Sedmentary Microfacies types and reservoir Characteristics of Chang62-61in Zhangchaiyaoziarea, Sedimentology, petroleum geology, reservoir geology, geophysical logging, etc.theory, with a large number of logging information, drilling information, thoroughly and systematically studied on the area stratigraphy tectonics, sedimentray microfacies types and distribution characteristics, reservoir chararcteristics. The Chang6reservoir belongs to delta front subfacies deposition, and further divided into distributary channel, interdistributray bay, mouth dam and distal sand bar, distributary channel and mouth bar deposits composite sand body comparative development.The result shows that reservoir lithology is the main powder-fine-grained, fine-grained feldspar sandstone, minerals low maturity, the higher the maturity structure, sandstone experienced strong diagenesis, mechanical compaction, pressure solution, cementation filling, erosion, metasomatism and diagenesis of authigenic clay mineral etc. for a typical low-porosity ultra-low permeability reservoir.Pore type main with residual intergranular pore, secondary intergranular dissolved pore, secondary intragranular dissolved pore, moldic pore and dissolved pore within the interstitial matter. Pore size is main middle and small pore, pore throat with fine and micro-throat mainly. Chang6reservoirs are classified and evaluated by the above data, hydrocarbon accumulation is controlled by sandstone body, porosity and micro structural of reservoir in Yongning area. Nose-like uplift structure and physical properties is the main factor to control oil water distribution.