Geological Studies Of Tanjiaying North District In Ansai Oil Field

By the use of the theories and methods including sedimentology, logging geology,reservoir geology, petroleum geology, this article systematically analyzed thesedimentaryfades, reservoir characteristics of the Chang-6oil-bearing formation in TanjiayingNorth district, Ansai oilfield.Tanjiaying North district, Ansai oil field, located in the central of Yi-Shan slope of OrdosBasin, is one of the new Exploration and Development District. According to the lithologicfeatures, electrical property, sedimentary rhythm, distribution of regional marked beds, and thesub-level sedimentary rhythm, the Chang-6oil-bearing formation were divided and contrast.On this basis, drew the configuration diagram of the top surface of the small layer, andanalysed of its structural characteristics. Through color, mineralogical characteristics,structural characteristics, biological characteristics, logging facies characteristics, and othersedimentology mark analysis, combined with previous edimentology studies, The depositionalenvironment of the Chang-6oil-bearing formation were divided to underwater distributarychannel, interdistributary bay and frontal sheet sand, and study the barrier characteristics.According to the study of tectonic stress and the date of adjacent district, principal stressdirections in the district were predicted. In addition, the study area reservoir heterogeneitywere analyzed from intraformational, interformational, and areal heterogeneities.According to the data from adjacent blocks and analysis data from indoor and outdoor,reservoir characteristics of the study area, including the drive type and formation fluidproperties were described in a detailed analysis.