Study On The Reservoir Characteristics And Distribution Regularity Of Chang 6 Oil Reservoir In Haojiaping Area Of Ansai Oilfiled

Based on core observation, combined with various analysis methods which are conventional porosity and permeability, casting thin sections and conventional constant-pressure mercury injection, the essay makes detail studies on the Chang 6reservoir characteristics in the Haojiaping area of Ansai Oilfield.From the comprehensive angles of tectonism, deposition and diagenesis, the thesis analyzed the distributing characteristics of oil and gas and its main controlling factors, and excellently select favorable area.The research showed that underwater distributary channel is the main forming of sand body.The main type of the sandstones are fine feldspathic sandstone and feldspathic lithic sandstone, the physical property of the reservoir is the typical low porosity and super-low permeability with relatively strong heterogeneity, and the porosity and permeability are 10.5% and 0.4×10-3?m2 in average.The main pore combination type of the Chang 6 reservoirs is residual intergranular pore and dissolved pore, with the poor reservoir pore structure. The displacement pressure is 1.35 PMa and the pore throat diameter is 0.17?m in average.The diagenesis types of the reservoir mainly includes compaction, carbonate cementation, dissolution and metasomatism. At present,diagenetic evolution basically entered in the middle diagenetic stage A, and local entered into the middle diagenetic stage B.With the oil and gas of Chang6 reservoir in the Haojiaping area of Ansai Oilfield uneven distribution in the longitudinal and planar directions, the oil and gas distribution is mainly controlled by sedimentary micro-facies and physical difference of skeleton sand bodies, and Chang6 reservoir which is lithologic hydrocarbon reservoir controlled by the tectonic effect is not obvious.Through analysis of reservoir key factors and hydrocarbon accumulation research, the essay combined with research area deposition, structure, physical properties and diagenetic features to make a comprehensive evaluation and classification, and excellently select 2favorable areas.