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泥质砂岩地层的油气评价是测井解释中的难题之一。本文用岩心分析、薄片观察、扫描电镜、岩石物性实验及测试验证等综合手段,研究了陕甘宁盆地的资料,着重研究了侏罗系延10低电阻油层的成因机理。文章提出了该类地层在解释中应注意的因素;研究了制约R_t数值、影响含油饱和度法对油气层评价的因素。本文所提出的岩性系数法,可用于评价比较复杂的剖面的油气层,也适用于一般砂泥岩地区。对低阻油层、重质油、含砾层等疑难地层,亦具有较好的效果。
Oil and gas evaluation in shaly sandstone formations is one of the problems in logging interpretation. In this paper, we have studied the data of Shaanxi-Gansu-Ningxia Basin by core analysis, thin slice observation, scanning electron microscope, petrophysical experiment and test verification, and studied the genesis mechanism of Yan 10 low resistivity reservoir in Jurassic. In this paper, the factors which should be noticed in this kind of stratum are put forward. The factors that constrain the value of R_t and affect the evaluation of oil and gas layers by oil saturation method are studied. The proposed lithological coefficient method proposed in this paper can be used to evaluate the hydrocarbon reservoir in the more complicated sections and is also suitable for the general sand and shale area. On the low resistivity oil, heavy oil, gravel and other difficult formation, also has good results.