Reservoir Characteristics Of The Upper Es3 To Es2 Formation In Shuangfeng Area

This article is based on reservoir geology theory.And it combines a variety of information,using a variety of testing techniques.the results show that the upper part of Es3 to Es2 can be divided into two second sequences,every sequences can be divided into several sedimentary cycles.Sedimentary facies of upper part of Es3 is model for open type shallow water delta.The main type of reservoir is delta plain distributary channel sand,delta front mouth bar sand and delta underwater distributary channel sand.Sedimentary facies lower part of Es2 is braided fluvial.I also study of various types of reservoir sand distribution in the established framework of sequence stratigraphy.From the first sequence to the fourth sequence the delta scale is increasing until to the fifth sequence it became decreased.Sand reservoir thickness up to the most in the forth sequence.And sand rate is highest in the vicinity of the well X 511.The sand thickness and sand rate of the upper part of Es2 is always high of all the area.Combined with analysis data,various types of reservoir sand bodies microscopic characteristics were studied and contrast.The result shows that river mouth bar sand properties is best and braided channel sand is worst.Since the study area in the gentle slope belt,the properties has little change in the vertical depth,and in the shallow,there has little diagenesis,the main factor causing properties differences are sorting particles.Calculating the physical limit of mouth bar sand and water distributary channel sand to clarify its development scale,can be used as the next focus of exploration and development.