| This study comprehensive utilization seismic, logging, geological logging and core analysis data, etc. Various kinds of geological material, uses the macroscopic and microscopic analysis study the method of combining the mo north oil field mo116area of the Sangonghe formation of sequence stratigraphic framework, four sexual relationship and reservoir characteristics in the thorough analysis and research.Mobei oilfield in junggar basin GuErBanTongGuTe abdomen is located in the desert. The area is located in the Mo north of the oil field of south, located in the structure in junggar basin’s north on the abdomen raised, the north for north east to bump south west to show the cloth strip shape of concave rose, and the north and LiuNa bump connect, south and MoSuo bay bump is linked together, things were in junggar basin on both sides for two big oil to sag north depression and the host haizi basin of west sag1well, has two faces of concave characteristics, structural position very favorable, mo-116well area of Sangonghe formation of J1s2trap type for structural trap, trap boundary by faults control. There are five oil traps (mo116traps, mo122traps, mo115traps, mo8trap, mo118traps).The area is located in the Mobei oilfield southern of1Mol16oil fields in2002, and has found exploration, oil field for the Mo116area of sangonghe formation on the oil reservoir geology research, made a lot of achievements and understanding. But in the deposition and phase type and space distribution and cloth, stratigraphic classification, reservoir features, and so on, there are different knowledge. This paper mainly for the Mo116area of sangonghe formation for secondary reservoir characteristics in the meticulous micro research, through your coring Wells in the casting body chip microscopically identification, and think of the three work for secondary although more than4000meters buried depth, but reservoir pore is primary porosity, is not secondary pore. Porosity types main development between primary porosity and surplus grain between grain pore, contain few calcite solution pores, grain of dissolve inside hole, tiny cracks, etc. In four kind of pore structure, Ⅰ class hole in the permeability (thick throat); Ⅱ hole in the class of low permeability (throat);Ⅲhole in the class of low permeability (fine throat); The worst Ⅳ class, low permeability and low porosity (micro pore throat). Purpose J1s21and J1s22belong to Ⅲlayer of reservoir layer, for low permeability and low porosity reservoirs, J1s21reservoir for fine throat way of holes with poor reservoir, J1s22reservoir for fine throat way in the hole in the middle of the reservoir.two sections of Mo116area of sangonghe formation sand body belonged to the braided fluvial river delta front sand body, because of the frequent swing single sand body thickness of the small and many layers, where the composite of good. Research shows that the116area of the three work for secondary (J1s2) mainly by brown gray-gray glutenite including ranging in sandstone, the grain gravel fine-grained sandstone and thick sandstone, growth underwater distributary channel, bohe river, far sand dam, between tributary bay four sedimentary micro facies. Including distributary channel and become the main estuarine bohe oil reservoir facies belt. Sand layer internal heterogeneity between high and low yield well is due to the main reason.J1s21reservoir lithology is mainly feldspar lithic sandstone, unequal particle fine-grained feldspathic lithic sandstone, fine medium-grained feldspathic lithic sandstone, fine feldspar lithic sandstone.Quartz feldspar sandstone average of32.2%, an average of21.3%, with an average of46.5%fragments, feldspathic lithic sandstone, a small amount of lithic sandstone.Detritus mainly tuff, an average of28.6%, as the felsitic rock, granite, quartzite, rhyolite.Clastic particles as a circular shape, second time round to second angular; separation medium, miscellaneous averaged1.5%, mainly mud and kaolinite cementation, average1.3%, calcite occupies the main body, followed by silica.Cementation way mainly for embedded type, followed by pore pressure block type.Particle contact main line contact, followed by point to line contact.J1s22reservoir lithology is mainly feldspar lithic sandstone, fine fine medium-grained feldspathic lithic sandstone, fine feldspar lithic sandstone.Quartz feldspar sandstone average of34%, an average of20%, with an average of46%fragments, feldspathic lithic sandstone, a small amount of lithic sandstone, lithic feldspar sandstone.Detritus mainly tuff, an average of24%, as the felsitic rock, granite, quartzite, rhyolite.Clastic particles as a circular shape, second time round to second angular; separation medium, miscellaneous averaged1.6%, mainly mud and kaolinite cementation, an average of1.9%, mainly calcite.Cementation way mainly for embedded type, followed by pore pressure block type.Particle contact main line contact, followed by point to line contact.J1s2reservoir with compositional maturity and structural maturity moderate to low, fine particle size, high content of plastic debris.Use of stable mineral (quartz) and unstable mineral (rock+feldspar) content to measure rock composition maturity, J1s21reservoir component maturity was0.47, J1s22reservoir compositional maturity is0.52, reaction Mo116well area of J1s21and J1s22rock composition maturity moderate to low.The area has high deposition rate, water power energy change fast characteristic features, but also reflect the sediment parent rock complex composition, source of frequent changes in the characteristics of.1) Mo116well area of Sangonghe Formation is divided into three sections(J1s1J1s2, J1s3), Sangonghe Formation in paragraph two (J1s2) can be further divided into2sand group,7layers.Oil is mainly distributed in the J1s2J1s2, J1s22-2, J1s22-3, J1s22-4small layer2)Mo116well area of J1s21and J1s22reservoir lithology mainly for long stone lithic sandstone, miscellaneous base mainly for the shale and kaolinite, cementation content mainly for calcite, cementation methods for the pressure embedded type, particle contact methods for the line contact has the composition and structure of medium low maturity card.3) J1S21and J1s22the main reservoir porosity types are consistent, and residual intergranular pore is the main primary intergranular pore, secondary, with small amounts of calcite dissolution pores, intragranular dissolved pore, micro fracture and trace interface crack.4) From the conventional property analysis J1s22reservoir is J1s21reservoir section properties than reservoir well. J1s21, J1s22reservoir porosity and permeability are better correlated.5) Mo116well area of reservoir for third class reservoirs, low porosity and low permeability reservoir, J1s21reservoir for the small fine throat poor reservoir, J1s22reservoir for hole middle-thin throats medium reservoir.Interlayer growth, strong heterogeneity.6) Mo116well area of Sangonghe Formation in paragraph two trap type for structural trap, trap boundary by faults control. There are five oil traps. Reservoir structure and the edge by bottom water control in the construction of high site, reservoir thickness, high oil saturation, tectonic low parts, reservoir thickness small, low oil saturation. Oil connectivity. |
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