| Shuanghe Oilfield experienced the high yield period, firmly period, degressive period three stages since the end of 1977 to invest in developing. Now has entered the stage of late for determining development low yield, but is still the key research of henan oilfield branch block. Shuanghe Oilfield is located in tanghe county of henan province and tongbai county territory, areal structure is located in Southwest of Biyang depression’s nose structure zone, Biyang Depression was a secondary depression in Nanxiang Basin, It belongs to a small intermountane. Sedimentary strata in the area have a bottom-up development:Paleogene Yuhuangding-Dacangfang formation, Hetaoyuan formation, Liaozhuang formation and Neogene Phoenix Town formation. The main oil-bearing series in Shuanghe Oilfield for the three section of Paleogene Hetaoyuan formation. predecessors divide the He-3 member into 9 oil formation, The purpose series of this study are Ⅲ, IV oil formation of He-3 member.After years of high speed and efficient development,Shuanghe Oilfield have High density of well pattern, high-water cut and high picking degree. Although the overall development effect is good, but the water content increases, the late development situation continues to deteriorate. In order to solve the problems in the research area, the development effect is further improved. In this paper carries on the distribution description and fine description of planar sedimentary microfacies in the research area. On this basis, analysis of the distribution characteristics of sand bodies matched with sedimentary microfacies. Through the analysis of sedimentary microfacies, in the study of the reservoir parameters, and analysis of heterogeneity of reservoir. In order to improve the oilfield later recovery efficiency and improve the development effect of geological basis.This paper system comprehensively collected the predecessors’research results this paper, on this basis, using the principle and method of sedimentology, comprehensive utilization of log data, core data, reservoir physical and dynamic production and so on, research on the Sedimentary characteristics,effective sandstone distribution and reservoir heterogeneity.According to the electrical characteristics, core data, well logging data, identify the standard layer. On the basis of predecessors’research, for Shuanghe Oilfield 438 pieces Ⅲ,Ⅳ oil formation of He-3 member stratigraphic division. Ⅲ oil formation is divided into 3 small layers,16 monolayer and Ⅳ oil formation is divided into 3 small layers,12 monolayer.Comprehensive structural setting, characteristics of heavy minerals, the ancient landform distribution etc to the provenance system were discussed, think Shuanghe Oilfield 438 pieces HI, IV oil formation of He-3 member of southeast provenance direction mainly. Fine description of the core well, Identify cross bedding Rock facies, parallel bedding Rock facies, massive bedding aleurolite facies, horizontal bedding aleurolite facies, Grey mudstone facies, shale and so on six kinds of rock facies. Based on the combination of rock facies characteristic and logging facies characteristic, think that the study area is mainly developed fan delta sedimentary system. And the whole study area belongs to fan delta front, Identify the underwater distributary channel, underwater distributary shallow channel, intermittent river, interdistributary bay such as sedimentary microfacies.Combining the Wells contrast, on formation and distribution of sand body thickness in different periods were studied, summarizes the development of the sediment source and the location of the center of the sediment. And analyzes the plane distribution characteristics of Shuanghe Oilfield 438 pieces sedimentary microfacies in each period, Summarizes the evolution law of sedimentary microfacies. During the deposition period of Eh3Ⅳ,the study area develops fan delta front deposition, water power is relatively strong,and provenance supply rich gradually. Early climate is relatively dry,provenance supply is less, sediment is given priority to with fine grained, multi development of underwater distributary shallow channel and intermittent river microfacies; The late climate change damp, hydrodynamic increase, provenance supply stability, develop the underwater distributary channel microfacies; It happened water-transgression in the end, the water deepened, Stable deposited a set of generic lake mudstones within the scope of the district, for the interdistributary bay microfacies. During the deposition period of Eh3Ⅲ, the study area develops fan delta front deposition, hydrodynamic change from strong to weak. Early water power is stronger, Provenance is relatively stable, Sediment grain size is fine-middle grain, channel thin out, near to the source develop the underwater distributary channel microfacies, develop a small amount of interdistributary bay microfacies in the middle of the study area, The late hydrodynamic weaken, the water deepened, but there were still a source of supply, develop the underwater distributary shallow channel microfacies.On the basis of the predecessors and standardizing the Wells in the studied area, for Shuanghe Oilfield 438 pieces Ⅲ,Ⅳ oil formation’s porosity and permeability conduct unified standard and unified interpretation. And based on the study of sedimentary microfacies characteristics, using the theory of logging and core analysis etc, to study the Shuanghe Oilfield 438 pieces III,IV oil formation’s characteristics of reservoir heterogeneity.According to core observation, Physical property data analysis and Logging interpretation result analysis, Shuanghe Oilfield 438 pieces Ⅲ,Ⅳ oil formation’s average porosity is 13.09%, average permeability is 58.83×10-3um2, Reservoir physical property is expressed as medium porosity and permeability reservoir. Due to the controlled by the sedimentary microfacies of fan delta front, Shuanghe Oilfield 438 pieces Ⅲ,Ⅳ oil formation in the study area permeability layer in rhythmic mainly for compound rhythm, other types are less common. Shuanghe Oilfield 438 pieces Ⅲ,Ⅳ oil formation’s in-layer heterogeneity and areal heterogeneity is strong.Microfacies types and their distribution controlled the reservoir property, and then affects the oil production and water absorption capacity of oil and water wells, control the underground movement of the injected water. So using the research results of subdivided sedimentary microfacies and the research of the heterogeneity of reservoir characteristics, the oilfield development and the research of well pattern adjustment has the vital significance... |
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