Fine Geology Study In Yushulin Oilfield

Since E16 and E18 blocks in Yushulin oilfield were put into production in 1993, their outputwas keeping in high quantity. After ten-year-old waterflooding development, inter-wellcontradiction was becoming more and more obvious, water content of production wells ininjection well row rise rapidly, production wells in production well row were hardly affected orrelatively little affected, these contributing factors affected the quality of total development. In order to readjust the development of oilfield in better way, taking Fuyang oil-bearing layerof E16 block for example, in this thesis fine geology study was carried out by adopting thefollowing technologies:Taking full advantage of drilling core data, development well logging data and developmentdynamic data;Under the regional sedimentary and geological background,comprehensiveapplying"cyclic correlation,fractional control, different treatment to different sedimentary faciesbelt" to zone correlation and subdividing sedimentation unit in fluvio-delta sedimentary system;Using micro-amplitude structural description technology with the macro-structure framework asbasis and structural relief of main productive layer as core;Integrating static with dynamicmethods to determine the distribution, type and strike of fractures.According to regional sedimentary background, in the thesis the strata were re-correlatedand divided using 210 well data, 49 sedimentary units was divided and sedimentary subfaciesmap of each unit was respectively compiled. The thesis also studied characteristics and changesof fractures and ground stress, carried out supplementary study for micro-physical property andreservoir sensitivity, appraised study of removing reservoir heterogeneity, and finally studied thedistribution of remaining oil by combination of static and dynamic methods, which laid thefoundation for adjusting and tapping the potentials in these blocks.