| The Wei Jia Lou area is located in Wei Jia Lou town in southeastern and the ground water resource is rich. The oil Layer segment is Yan Chang group of the upper triassic.It is multi-level combination for oil, including main oil layer segment as chang61oil reservoir, followed by chang62, the rest is chang4+5oil reservoir, local exploration wells show oil layer in chang64and chang10.Wei Jia Lou area about the domain structure located in above ordos basin level II tectonic units-north slope, the slope is big single inclined which is a gentle western-leaning.According to the regional sedimentary background,sand distribution, the division of the rock type and observation of well logging curves, the sedimentary facies ofWei Jia Lou inHeng Shan oil field is the delta distributary channel deposition which is belongs to the delta plain.The lithology, physical properties, pore structure and the control factors of reservoir were studied on this paper. It was shown that the rock types of the reservoir are lithicse and arkose, which are characterized by low composition maturity and high textural maturity. The physic properties of the rock are relatively poor, belonging to low porosity and low permeability. Among them the secondary, interⅣgranular dissolved pore is the most importent This reservoir main belongs to the special low permeability reservoir (Ⅲ) and ultra-low permeable reservoir (Ⅳ), combined with the core analysis data and the logging interpretation,it shows that the long61oil reservoir is the section Ⅲ in the special low permeability reservoir primarily. Combining with core property test material, this paper also mainly to researchs the long61reservoir heterogeneity and has a certain analysis. |
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