Study On The Flow Units OfYang DaChengZi Member In Block38in Fuyu Oilfield

China has entered the high water or high water cut stage after decades of water flooding.But there is still a considerable number of remaining oil in the channel sand bodies.Reservoir sand plane is in poor connectivity and Reservoir heterogeneity is serious.This lead to lower oil yield. To enhance oil recovery is an effective way to realizing oilfield production. To reveal the underground reservoir remaining oil forming mechanism and distribution law is the foundation.Flow unit study is the new development of oil and gas geoWellical theory and characterization methods to solve the difficult problems.Block38of Fuyu oilfield is "the Tenth Five-Year" period capacity building a key block in Jilin Oilfield in recent years.By the Rolling exploration and development in recent years.By the increasing of the static and dynamic data,geoWellical cognition, questions increased.The reservoir flow unit could improve the current production situation and the dynamic reserves, thereby increasing the oil recovery purposes.Reservoir fluid units are kinds of reservoir rock mass distributed continuously in three-dimension space at various level from macro view to micro view which havesimilar rock characteristics influencing fluid flow and filtering attributes of the fluiditself.They are reservoir genetic units resulted from multiple geoWellical functions include sedimentary process、diagenism and after reconstruction.The study and division of flow units could be used to judge reservoir reasonably and further predict the distribution of reservoir and residual oil/gas.This article takes Yang DaChengZi reservoir of block38in oil field as study target, guided by modem sedimentation and sequence stratigraphy theory,by using the combination of multi-disciplinary research methods and techniques such as HR sequence stratigraphy、petroleum geoWelly、petroWelly、reservoir geoWelly、 geostatistics and other means of modem analysis to early out stratigraphic division and correlation,establishes isochronous stratigraphic correlation framework in study area. Having established the flow unit model by using the PETREL modeling software to the block Zhong38of Fuyu oil field. This article considered deposits the flow unit distribution control action.Adopted has controlled the sequential indicator stochastic simulation method based on sedimentary model the method to estabulish the flow unit model to this area, and put forward the distribution rule ofremaining oil controlled by formatting unit. The main achievement ofthis study is:(1) With the application of cycle contrast and graded control principle, to study the184Wells region partition and contrast of layer, will study purpose layer segment subdivided into6sand groups and15small layers, and based on the time when symbol in lithoWelly strata trellis as the strata.(2) Combining regional geoWellical setting and the sedimentary facial character of Yang Da Chengzi oil reservoir in Zhong38Area, what has been determined as fluvial facies is further parted into three subfacies, including riverbed, embankment, overbank, the micro facies such as point bar, natural levee, crevasse splay, floodplain and overbank sand and explained its space-time evolutionary regular pattern, the micro face of channel sandbar is the main reservoir bed of this area among them.(3) Based on core analysis and test data,it develops four properties relations and reservoir petroWelly characteristics and heterogeneity study, sets up the reservoir parameters interpretation model, then does the second interpretation of Wellging data for184wells.(4) His paper has discussed the concept of flow unit and its genetic influencing factor. Flow unit is defined as a reservoir unit, which is continuous on longitudinal and cross, has the same characteristic parameter that can influence fluid flow. It is reservoir unit has similar lithoWelly and physical property in reservoir layer. The reason and influencing factor of flow unit mainly include sedimentation, diagenesis.(5) The flow unit are divided into4types by means of clustering analysis. Through study of characteristic parameter used to symptomize fluid unit, this article Uses permeability, porosity, shale content,flow zone index (FZI) and combine coring well established four clustering centers formed by discriminant function, divided flow unit types into1,2,3,4,and5types of flow unit is a nonreservoir.(6) Apply petrel modeling software to establishing structure model. Using the deterministic modeling method to build the sedimentary microfacies model. Combine Tectonic model, sedimentary model and sequential indicator stochastic simulation method based on sedimentary modele to simulation model of flow unit. By establishing the model, master Daqingzijing oilfield Block38flow unit space distribution rule and structure characteristics.(7) The space distribution character of flow unit in this area has been put into research, and in contrast to physical property and sedimentary micro—faces of these reservoirs. The better of flow unit, the thicker of sand body,the higher of porosity and permeability. Sedimentary face has a controlling effect on the distributon trend of flow unit. But the same micro face can be divided into different flow unit due to the vadose differences in it. So their distribution not only has same trends but also has differences.(8) Yang DaChengZi reservoir can be divided into four types flow unit, the plane distribution of flow units are controlled by sedimentary facies. River center area, main beach for1and2type flow unit, channel flank, the upper channel and excessive bank sand flow for type3and4more units. Yang DaChengZi reservoir is given priority to with3,4type flow unit. (9) Through studies on the4types of flow unit in this area, we concluded that Yang DaChengZi reservoir flow type1,2and3flow units of remaining oil saturation is higher, the reservoir with low degree which is the next step exploration targets.(10) Yang DaChengZi reservoir flow unit bottom-up,1type of low ratio of flow unit, four types of proportion of flow unit decreases after bigger first, overall, compared with the Fuyu oil layer, flow unit is bad, in addition, each small layer as a whole, which mainly is given priority to with3,4type flow unit.