Red Son Oilfield Well Gongsi Remaining Potential In Yanan Group Reservoir Research

Hongjingzi oilfield began to explore in the60s of the last century, explored geological reserves is1448×104t. Now Hongjingzi oilfield entered the double high stage, the geological reserves degree of reserve recovery is20.14%, the conditions of rhe oil reservoirs are very complex, the number of oil-bearing series is very large, producing’s history is very long, the relationship of oil-water is complex, and most wells are closed or half-closed, this problem are severely restrict the work of the rolling exploration, the increase reserves and production. To this end, there is an urgent need to carry out the fine geologic study of the old oil fields and the remaining potential analysis, described the fine features of the tectonic, sedimentary, reservoir and reservoir, revealing the law of oil and water relations and distribution of remaining oil, look for the potential target for the secondary development of Hongjingzi oilfield’s improving recovery and sustainable development to laid a solid foundation. Hongsi area is an important production area of Hongjingzi oilfield with the high level of remaining reserves, so the area has good potential for secondary development, but the number of oil-bearing series is very large, there are many adjustmented layers and monitoring data of the residual oil is less are restricting the current work area to carry out detailed geological studies. Now, Hongsi area has come into the phase of high water cut stage, the scale of reservoir is small,and the distribution of remaining oil are complex ang unclear, all of this hindrance the smooth development of a the Hongjingzi oilfield.For the above issues, this paper carry out the reserch work through the fine geological studies of the secondary development of the Hongsi areas.Using the development geology, reservoir description, relying on the stratigraphic classification and correlation, the analysis of structural characteristics, sedimentary characteristics and reservoir heterogeneity characteristics to obtained the oil field’s static characteristics:research the micro structural characteristics of Hongsi area reservoirs in depth, according to the affect of the type and characteristics of micro structure to the distribution of remaining oil, forecast the distribution of remaining oil of the Yan’an Formation reservoir of Hongsi area; Divided the sedimentary microfacies using the sign of the sedimentary facies, researched the plan and profile distribution characteristics of microfacies, and forecast the distribution of remaining oil; Study the characteristics of reservoir roks, reservoir microfacies, composition and of the structure of rokes, analyzed every main layer reservoir’s heterogeneity and different micro-reservoir’s heterogeneity, summed up four kinds of the penetration rhythms and the affect to the distribution of remaining oil, analyzed the structure of sand of the reservoirs, including the morphological characteristics in plane and vertical orientation of the sand, the size of the sand and the internal structure of it, the distribution characteristics of interbedded stratum, summed up three kinds of Structures and their affect to the distribution of remaining oil, and using the means of exponent of zone of flow to divided the reservoirs flow unit, calculated the saturation of the residual oil, and described the horizontal distribution characteristics. In the last, throughing the Study of the affect of micro structure,the sedimentary microfacies and reservoir sand to the distribution of remaining oil in the study area, combined with the dynamic data, product statistics, the product process and the dynamic law, comprehensively analysed the main layer of the remaining oil in the size and distribution characteristics, analysed the remaining oil potential of the study area, preferred the potential region.This study is important to the rolling exploration and increasing the recovery ratio of the Hongjingzi oilfeild.