Changjia River Region Long 6~1 Geologicai Characteristics Research

Chai Jia He oilfield is located in Yishan slope of Ordos Basin in the eastern region, the regional tectonic is a West dipping monocline, dip angle less than 1°KM gradient 7 to 10 meters, monocline background on local development low amplitude nose like structure. This area is one of the main development of Hengshan oil production plant in 2008 and the main producing areas, layer of Mesozoic Yanchang 6 reservoir.Through the large and thin layer contrast, we get a total of 1 reservoirs,3 small layer; the main small layerC611 and C612. Through a large number of core observation, field profile survey and experimental data analysis, pore types are mainly residual intergranular pores and dissolved intergranular pores, diagenesis is the main factor affecting the reservoir physical properties, compaction and cementation are the main reasons leading to the difference of the properties of the sandstone. The average of C61 porosity of reservoir was 11.98%, average permeability is 0.98×10-μm2.The layers is low porosity and low permeability reservoir.Through the study of reservoir heterogeneity, reservoir physical properties are not strong, and the distribution of each layer in the plane is a single peak, and the porosity distribution is a single peak. From the main reservoir distribution studies showed that:Chai Jia He C61 reservoir layer is not long, main reservoir from well section is not long; single well controlled oil-bearing layer is less, thin layer thickness; low single well controlled reserves, single well production is low. At the same time, storage layer lithology, physical property and fluid property is relatively close. In the reservoir set layer heterogeneity and pore structure on the basis of, the study on the relationship of the study area, build logging interpretation model to study the reservoir parameters, according to the logging interpretation chart and determine the research area of lower and lower limits of electrical, finally carried out the research of geological reserves comprehensive evaluation. The results show that:C61 reservoir of research proven superimposed oil-bearing area 5.0km2, proven oil geological reserves of 198.06×104t, recoverable reserves of 22.38×10 t, it is a small reserves of oil field.Crude oil can be recoverable reserves abundance was 39.4×104m3/km2, belongs to the high abundance of oilfield. According to the calculation of reservoir in the deep, it is a shallow reservoir.In according to reservoir classification, which belongs to the low porosity and low permeability reservoir.