LOG CURVE NORMALIZATION OF C-6 OIL-BEARING FORMATION IN HAIZITA AREA, ORDOS BASIN
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摘要: 研究区延长组沉积为陆相三角洲沉积，主要含油气层位为长6油层组.受沉积环境及泥岩中有机质含量的影响，该区非渗透层段测井曲线响应差异较大，使得测井曲线标准化效果不佳.针对此情况，在借助自然伽马、井径测井、声波测井、感应测井等曲线构建"视标准层"的基础上，利用ΔlgR方法剔除受有机质影响明显的非渗透层段，进而选取不受井眼条件、岩性、物性、含油气性等因素影响的非渗透层段作为"视标准层"，最后采用直方图法对研究区测井曲线进行标准化，并结合孔隙度计算模型进行了检验.研究结果表明，ΔlgR方法可以较为有效地消除非渗透层段有机质含量的影响，提高陆相地层中"视标准层"构建的质量，为后期储层参数的确定奠定基础.Abstract: The Yanchang Formation is derived from continental delta facies in Ordos Basin with C-6 oil-bearing formation as the main reservoir. During the normalization of log curves, the log responses of non-permeable layer are quite different due to the influence of sedimentary environment and organic content in mudstone, which eventually leads to the lack of marker layer with stable log responses. Under this situation, on the basis of the construction of virtual marker bed by means of curves like gamma ray, caliper logging, acoustic logging and induction logging, the ΔlgR method is used to remove the impact of organic matter in non-permeable layers, and then to select a "virtual marker bed" unaffected by borehole conditions, lithology, physical properties and oil-gas potential. Finally, the histogram translation is applied in normalization of logging curves followed by test with the porosity-calculated model. The results show that the ΔlgR method is an effective way to eliminate the effect of organic content in non-permeable layer and to improve the construction quality of the"virtual marker bed" in continental strata, which also lays foundation for later determination of reservoir parameters.
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Key words:
- C-6 oil-bearing formation /
- log normalization /
- ΔlgR method /
- virtual marker bed /
- histogram translation /
- Ordos Basin
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