Research On Residual Oil Distribution About Tight Sandstone Reservoir

Honghe oil field locates in the western edge of the southern section of Tianhuan syncline of Ordos Basin,and is a typically tight sandstone reservoirs.The target layer of study area HH105 wellarea is Triassic Yanchang formation,about 2200-2300 m deep,and the main producing formation is the C812 layer,with low porosity,ultra-low permeability,low abundance.the reservoir and why it is easy to discover oil reservoir but hard to get high production.The fine description of Honghe oil field is very important to the study of the residual oil distribution.This paper base on the strata structure built by the explanation of logging and seismic materials,distribution of sedimentary facies and the characters of the physical properties about reservoir rocks,the 3D reservoir modeling.According to the classical decline theory of Arps,this paper have studied the decline pattern about reservoirs and each well,then to identify the main factors affect the productivity about reservoir`s and each single well from geological and development this two aspects,namely the sensitivity parameters of reservoir.Eclipse software can match outputs of the oil well,characterizing the distribution of residual oil through the reservoir daily outputs.This will provide more underground information for economical exploitation in the future.