Reservoir Characteristics Of Chang 2 Reservoir Group In Hu130 Well Area Of Hujianshan Oilfield

Hu130 well area of Hujianshan Oilfield is located in southwestern area of Dingbian County,western of Ordos Basin.The Chang2 is the main reservoir of oil and gas of this area.However,because of the high viscosity of oil and the poor reservoir physical properties.In order to improve oil recovery,it is necessary to carry out advanced water injection development in this area.Therefore,it is necessary to study and evaluate the reservoir characteristics of Chang 2 in this area and understand the reservoir sand development and distribution regularity.In addition,understanding reservoir physical properties,sensitivity,to provide theoretical and data support for advanced water injection development.Based on the analysis of core observation,thin section identification,physical characteristics test,organic geochemistry experiment and X-ray diffraction,and combined with regional sedimentary background,logging and oil testing data,the chang2 of Yanchang Formation in Hu 130 well area of Hujianshan Oilfield in Ordos Basin will be analyzed on the basis of previous studies.The research understandings have been obtained: The sedimentary period of the Chang2 is a set of delta front subfacies deposits accepted on the basis of Plains formed after lake filling and completion disappeared.The structural form is monoclinic structure with High East and Low West,and five rows of nasal eminence are distributed near East-West direction.The pore types are mainly intergranular pore and feldspar karst pore,with a small amount of cuttings karst pore,intergranular pore and shrinkage pore.The main types of laryngeal passages are neck-constricted and pore-constricted ones,with some flaky and curved ones.Reservoir has medium physical property and belongs to medium-low porosity-low permeability reservoir.Reservoir sensitive minerals are mainly chlorite and kaolinite,and glimmerton content is low.Chang2 reservoir is weak water sensitivity,weak to no speed sensitivity,improved to no acid sensitivity,no to weak salt sensitivity.