A Study On The Main Control Factors Of Reservoir Forming And Assorted Techniques Of Effective Deceloping For FuYu Oil Layer In QiJia Oil Field

This paper use amount of the well logging, 3-D seismic, testing for oil and dynamic developing materials of the exploration wells, evaluation wells and develop control wells which were finished drilling recently, proceed a research of oil geology characters of the FuYu oil layer in QiJia oil field in QiJia-GuLong Sag, which is located in the center downwarping region of the north SongLiao Basin, analyse the main reservoir control factors and the oil concentration conditions, then study and improve the valid developing necessary technology for marginal reservoirs.Study the sequence strata division and setup the sequence strata framework by using the theory of high resolution sequence stratigraphy, bring the sublayer (5-class sequence) divide correlation arrangement of FuYu oil layer, found the phenomenon of local overlapping in the second twist break band of FuYu oil layer in QiJia oil field. By using equitime sediment microfaces analysis technique, deepen the recognitions of sediment chatacters and diagenesis of the study area. The sedimentary environment of this area is the shallow water river-delta deposit which is controlled by both the north and the west QiQiHaEr sedimentary system and the distributary channels are developed. Study the growth chatacters of the reservoir secondary pores of FuYu oil layer by using the technique of lithophase analysis and confirm the main control factors for the formation of secondary pores are sediment microfaces, diagenesis and deposit phases that is the different lithophase. Directed by the theary of pool-forming dynamics, conclude the main control factors and reservoir mode of the FuYu oil layer in the west of DaQing Placanticline through study the hydrocarbon implantation stages and reservoir forming time of FuYu oil layer by using the technique of reservoir forming chronology and fluid inclusion checking. On the base of studies of the structure, sequence strata, sedimentary microfacies, container rock diagenesis, hydrocarbon reservoir forming and the relationship of them, bring a suite method to select the oiliness range of profitability by predict the"sweets"of seismic datum reflected from the thin and narrow river channel sand bodies which controlled by the lithophase and directed by the theary of high resolution sequence strata.In view of reservoir characters of extremely low permeability, sand body alternation and fragmented distribution of FuYu oil layer in QiJia oil field, this paper also studied the well network of extremely low permeability container rock and the optimize design proposal for the large scale fracturing, purchase satisfactory effectiveness in the system optimization of the low-damage fracture fluid and the test of clear water fracture fluid. Developed a reciprocating submersible pump with characters of low energy consumption, low cost price and amplectant which can meet the developing request of the marginal oil field and the simplified technology for surface projects with characters of"clump-style, tree-style, simple, excellent". Buildup an assorted technique of economic and effective developing preliminary for FuYu oil layer which has an extremely low permeability in QiJia oil field, and this has a strategic significance for increaseing the reserve and production in the extremely low permeability reservoirs in the west DaQing Placanticline.