Reservoir Characteristics Of Songjia Depression In The Liaohe Oilfield

The study of reservoir characteristics is a key part in the petroleum geology research during for the oil and gas exploration and development, and has and important effect on evaluation on reservoir reserves, production and development.In this thesis, characteristics of Songjia sub-sagof Liaohe Oilfield has been studied, including stuctural development, determine the stratigraphic and structural features macroscopic reservoir; identification and seismic reservoir prediction by sedimentary facies, developmental characteristics portrayed macro sand body; reservoir pore characteristics and diagenesis studies reveal microscopic physical characteristics of the reservoir, and controlling factors for the reservoir. Studies have shown that Songjia sub-sag Mesozoic rift and depression experienced two tectonic evolution stage, normal faults with NE-NNE and NW trending are well developed.There, the depression is divided into several sub-tectonic belt, containing the western slope, central anticline belt, eastern and southern mired with complexity belt. In Songjia sub-sag Jiufotang Formation mainly consists of fan delta of alluvial fan sublacustrine fan system, Sand of alluvial fan-fan delta system, alluvial fan-fan delta system. During the the early stage ofFuxin Formation the sedimentary facies are dominant with the later alluvial fan-floodplain system. Alluvial fan, fan delta sand bodies in the study area is the most important oil and gas reservoirs. Physical properties of reservoir properties decrease from top to bottom, Fuxin group in the upper hole-permeability reservoirs, the best properties;Fuxin group Shahai lower section and low permeability and low porosity-permeability reservoir characteristics, poor thing Jiufotang holes-especially for the ultra-low permeability reservoir, the worst properties.Fuxin group and the lower reservoir of sand reservoirs as a class, good reservoir properties, reservoir-cap better; upper reservoir of Fuxin group II reservoir, good physical properties, reservoir-cap moderate;Jiufotang reservoir into three reservoirs, poor thing, a combination of good reservoir cap.