基于交会图和贝叶斯聚类分析法的岩性识别方法

摘要:本文将针对造成伊通盆地莫里青断陷测井解释符合率低的主要因素即复杂的岩性，开展研究，根据这一状况，提出了利用交会图 及贝叶斯聚类分析算法 的岩性识别方法。先对区域资料进行测井响应标准化 ，选择出合适的样本数据，确定自然伽马，电阻率，声波时差，中子，密度五条测井曲线作为岩性识别的参数，符合率达到82.9%。在对区域内十口探井进行岩性解释，最终符合率达到87.1%，有效地提高该区域的解释精度。

Method of lithologic identification

According to main factor of low coincidence rate of log interpretation in Moliqing Faulted Depression of Yitong Basin,the paper carrying out research puts forward a lithologic identification method of using the crossplot and bayesian cluster analysis algorithm. First, logging response standardization on the regional data, choosing the appropriate sample data, putting five logging curve of the natural gamma ray, resistivity, interval transit time, neutron, and density as lithologic identification parameters, coincidence rate reached 82.9%.Through lithology interpretation on ten exploration wells in the area, and ultimately coincidence rate reached 87.1%, and the method effectively improves interpretation accuracy in the region.