Fine Description Of DU 813 Block Reservoir In Huanxiling Oilfield

DU 813 block reservoir in Huanxiling area of Liaohe Oilfield is a large geological reserve of oil, fluid property of oil has the characteristics of "four highs and low" : high density, high viscosity, high solidifying point, high pitch and resin and low wax content. Beginning in 2002, the exploitation of DU 813 block reservoir in a planned way, experienced a steam stimulation, steam flooding and SAGD technology, oil production but oil output was decreasing year by year.The main reason is strong heterogeneity within the reservoir,Mobility of fluid is poor, lead more inefficient wells, Lower producing level, more remaining reserves, and poor mining efficiency. There is an urgent need for a fine description of the stratigraphic sequences, structure, reservoir and water distribution in this area, to guide oil development and adjustment of the next work.In this paper, there is a fine description and analysis of DU 813 block reservoir in Huanxiling Oilfield for the technology of reservoir description, the small layer of Du 813 block has detailed division and contrast by the sequence stratigraphy theory.On the basis of a small layer of division and contrast, this paper explored the reservoir structure, reservoir conditions, fluid properties of crude oil and the other research. Combined production mode and the factors of affect productivity, this paper has a new reservoir reserves assessment to determine the potential for exploitation of the region and suggested to two horizontal wells deployment in DU 813 block.Through research it Mainly achieved the following understanding:(1) Under the flag layer control, in accordance with the principle of sequence stratigraphy layering, Xinglongtai oil reservoir layer of South Du 813 block from top is divided into four groups: XingⅠ, XingⅡ, XingⅢ, XingⅣ and seven sandstone groups;(2) Reservoir of DU 813 block is a shallow, weak compaction in thestrata, poor cementation, good reservoir properties, high porosity, high permeability reservoir;(3) XingⅣ group of Xinglongtai oil in DU 813 block is gravity flow submarine fan deposition model, XingⅠ~Ⅴgroup are edges of the shallow lacustrine fan delta depositional model, respectively those development braided distributary channel microfacies, split mouth bar micro-phase shunt a thin layer of sand between the micro-phase and edges, marginal bank/river island microfacies, split between depression and other types of sedimentary microfacies;(4) It is to determine that the DU 813 block of South belongs thin interbedded super heavy bottom water reservoir;(5) It is redefining oil-bearing area, effective thickness, porosity and oil saturation and other parameters of DU 813 block, and had a re-evaluation of its reserves;(6)This paper proposed a favorable deployment of two wells, provided base information for this block further develop and improve the well network, adjusting the development plan,improving relationship between injection and production.