摘要
由于在渗透性地层处存在钻井液侵入影响,使观测得到的地层电阻率和冲洗带电阻率与实际的电阻率相比存在较大偏差,降低了利用测井资料区分油气层与水层的分辨率。文章论述了基于几何因子理论的泥浆侵入校正原理,并离散了钻井液侵入校正量版,拟合得到地层电阻率、冲洗带电阻率、侵入直径、几何因子之间的关系。利用这些关系式,采用迭代法对新疆塔河石炭系地层进行钻井液侵入校正。试油与测井解释结果对比证实, 校正提高了地层电阻率和冲洗带电阻率的精度,提高了解释油气层的符合率。
Because of the influence of drilling fluid invasion on permeability formation, the measured formation resistivity and flush zone resistivity values were greatly deviated from the actual ones, thus reducing the ability of distinguishing the oil and gas layers from the water layers by log data. The relationships among formation resistivity, flush zone resistivity, invasion diameter and geometrical factors were fitted according to the drilling fluid invasion correction principle based on geometrical factor theory and to the discrete drilling fluid invasion correction charts. With the aid of these relationships, the drilling fluid invasion correction of the Carboniferous in Tahe region of Xinjiang was carried out by use of iteration method. Through comparing the result of log interpretation with that of production test, it was proved that the precisions of both formation resistivity and flush zone resistivity are raised by the correction, thus increasing the coincidence rate of interpreting oil and gas layers by log data.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2005年第7期41-43,共3页
Natural Gas Industry
