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百色盆地东部坳陷中央凹陷带那读组储层具有低孔隙度低渗透率特征,一直缺乏有效评价该地区储层泥浆污染程度的方法。首先通过研究泥浆侵入对电阻率测井的影响,理论推导了一种直接利用深、中、浅电阻率组合测井资料计算泥浆侵入深度的方法,并根据泥浆污染深度与泥浆侵入深度的关系式,得到储层泥浆污染程度评价定量指标;其次分析储层产量和物性参数的相关程度,建立了储层产量和物性参数间的定量计算模型,间接地实现了储层泥浆污染程度的定量评价,形成了一套用测井资料评价储层泥浆污染程度方法,为科学钻井的实施提供了重要依据。经实钻结果验证,所建立的评价方法有效可行,取得了良好的经济效益,具有明显实用价值。
The reservoirs in the Nadu Formation in the central depression of the eastern depression of the Baise Basin have the characteristics of low porosity and low permeability. There is a lack of effective methods to evaluate the degree of mud pollution in the reservoir. First of all, by studying the influence of mud invasion on resistivity logging, a method of directly calculating the mud invasion depth using the combination of deep, medium and shallow resistivity logging data is derived theoretically. According to the relationship between the depth of mud contamination and the depth of mud invasion , And get the quantitative index of evaluation of the degree of reservoir mud pollution. Secondly, the relationship between reservoir production and physical property parameters is analyzed, and the quantitative calculation model between reservoir production and physical property parameters is set up to quantitatively evaluate the degree of reservoir pollution indirectly. A set of methods for evaluating the degree of reservoir mud pollution with well logging data is provided, which provides an important basis for the implementation of scientific drilling. The real drilling results verify that the established evaluation method is effective and feasible, and has achieved good economic benefits, with obvious practical value.