The Study Of Geologic Features And Development Prospects Of Chang9~1Reservoir In Wu Cangbao Oilfield

In order to increase the production rate, on the base of the geologic feature and make the most of the information of core-hole and geophysical well-logging, make use of the method that moving and static state combined together, research deposit micro facies and the developing prospects of reservoir form several aspects. Using core observation and the data of thing identification, X diffraction, electronic probe spectrum and image analysis, According to the geological materials, preliminarily delineated the oil-bearing area and average effective thickness. Study of sandstone characteristics, pore structure and pore types.The main contents of the conclusions can be summarized as follows,On the basis of analysis on C91reservoir micro-structure for the first time, the result show distribution of top surface of sandstone in C9is concordant with tectonic background. There is a nose structures along Well Wu27-Well Wu28side in northern area. And an east-westward micro tectonic uplift is located in the southern area along Well Wu34-Well Wu37. These two uplifts play a positive role in oil accumulation.The main sand body of C91reservoir is subaqueous distributary channel. The subaqueous distributary channels are arranged as "S" shape through Well Wu27, Wu28, Wu35and Wu41. The sandstones developed in the north area, around Well Wu27and Wu28, are distributed in EW direction. The sandstones developed in the middle south area, around Well Wu28, Wu41and Wu35, are distributed in SN direction.The research show that C91, main reservoir rock type is feldspar sandstone. Intergranular pores and dissolving intergranular pores is predominant pore types. On the whole, C91is a typical low pore low permeability reservoir.the main oil abundance zone is located in the region following Well Wu27-Well Wu9-Well Wu35-Well Wu34-Well Wu41. Allow for there is some Jurassic oil reservoir, Integral arrangement is suggested. Development program such as advanced or synchronous water injection and stratification development by stages are designed.