The Study Of The Characteristics Of Sand Body And Distribution Of Oil And Gas In Chang 6 Oil Layer In The Jianyucha Oil Field

Janyucha oilfield is located in the middle of Shanbei slope of Ordos basin.The main oil producing horizon is located in the Chang4+5 and the Chang6.In recent years,the rate of water content rising quickly in the oilfield,water drive effect getting worse,in order to analyze the reasons and adjust the water injection development program,the structure characteristics of sand body and the distribution is very necessary.This paper is guided by sedimentary petrology,well logging geology and sequence stratigraphy,using logging facies analysis,based on the regional stratigraphic correlation,combined with previous research results,it is concluded that the sedimentary facies in the study area are delta front deposits.Based on the study of single well facies and well facies and well facies,the distribution characteristics of sedimentary facies are described.According to the characteristics of the logging facies,the vertical structure,superposition pattern,contact relation and boundary identification of the single sand body are studied.According to the characteristics of sand body development,and combining with the background of sedimentary microfacies and the electrical response law of logging curves,the classification of sand bodies in the target horizon of the study area is carried out by using the principle of base level cycle.According to the characteristics of sedimentary facies,with the sand ratio and sand thickness,the thickness of the oil distribution,determine the distribution of sand body and sand body plane.And then,through the analysis of oil and gas distribution in the reservoir profile,the influence of the sand body structure on the water injection development effect is analyzed by the contrast of injection production.Research shows that the sand bodies of Chang61 are mainly distributary channel and mouth bar sand body,single sand body has 4 types of vertical structure,development of various overlay structure of multilayer sand body,single sand body vertical contact between the 3 species,identification of sand body boundary mainly by logging curve difference,sand sand body thickness difference,top elevation difference.Based on the principle of base level cycle,the genetic types of sand bodies in this area can be divided into 3 categories: the origin of distributary channel,the origin of the mouth bar,and the complex genesis of distributary channel and mouth bar.On the basis of the study of sand body partition and internal structure,the effect of sand body structure on water injection development was studied.The results show that the larger the sand body thickness is,the better the water injection effect is.