| With the amount of consumption of crude oil continued to increase, demand for oil industrial output also rose rapidly, and in each new discovery of reserves, 2 / 3 for extra low permeability reserves, therefore the development of use of extra low permeability reservoir is very important. Wangfu depression clastic rock reservoirs have been found for low permeability sandstone reservoir layer, for single channel sand body is thin, horizontal extension of the scope of the small, phase change faster problem, with the high resolution sequence stratigraphy and oil-gas reservoir sedimentology as a guide, the establishment of composite channel sand body of the high resolution sequence stratigraphic frame, use for city deep 2 well section of dense well sedimentary microfacies and channel sand body description,the reservoir characteristics are systematically analyzed, and prediction of favorable reservoirs.The integrated application of heavy minerals, cores, logging, well logging, and seismic data, the sedimentary combination of core, logging, seismic phase research methods, research development of Quantou Formation of fine sedimentary, determine the palace area spring head group source direction from south, braided river, meandering river deposition, river development, embankments, River diffuse, braided channel, the bank deposits of five kinds of subfacies. Using scanning electron microscope, polarizing microscope, X-ray diffraction and mercury analysis and testing means to observe and describe the storage layer lithology, Kong Xixing and physical characteristics, and determine the objective layer of diagenetic stage,analysis of the influencing factors of influencing reservoir properties. The results show that the types of reservoir rocks are mainly composed of feldspar and rock, and the medium or lower part of the composition is mature. The higher the content of clay minerals, clay mineral illite mixed layer and illite, kaolinite and chlorite is the second. The grain size is fine sand fine sand structure, and the rock structure is medium. The main types of the three section of spring are mainly feldspar sandstone, rock debris and feldspar sandstone, medium composition of the rock is medium, and is relatively high in the spring. Grain size is mostly fine sand and fine sand, and the structure is slightly higher than that of spring. There are four types of reservoir in the first member of the formation of the first section of the formation of the three section of the formation of the first section of the member of the house of the palace of the palace, the primary intergranular pore, micro fracture, intergranular corrosion pore and intergranular dissolution pore. The development of micro cracks is less, and more in the three section of theshallow spring, the dissolution of pores and dissolution pores in the study area are widely distributed in the study area. The pore structure of the reservoir is mainly of grade III,accounting for 62.4% of the total sample. The second is the class II and I B pore structure,which accounts for 25.4% and 12.2% of the total sample. The main diagenesis types include mechanical compaction, cementation, replacement and dissolution. In the early diagenetic stage B and the middle diagenetic stage A. Quantou group a porosity and average porosity was 5.67%, average permeability is 0.53 x 10-3 g m2; Quan 3 section average porosity is14.23%, average permeability is 3.28 x 10-3 g m2, low porosity ultra low porosity and ultra-low permeability and ultra-low permeability. Optimization of seismic inversion method of the palace area of storage reservoir prediction, of Quantou Formation and the sand group,small layer sand body thickness plane distribution characteristics and analysis of sand body distribution and favorable exploration areas identified as research area in the northeastern and southeastern sand bodies are well developed in place. |
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