论文详情
准确、有效的岩性识别是火山岩油气藏勘探评价的关键。以克拉美丽气田石炭系火山岩为例,在薄片鉴定和岩心分析基础上,应用常规测井曲线建立岩性识别图版,发现岩性之间存在严重交叉和重叠现象,影响岩性识别的准确性。为了修正直接图版法的识别误差,采用对应分析法分析测井响应与岩性的相关性,发现自然伽马、补偿中子、地层真电阻率曲线对岩性最为敏感,进一步计算出各曲线点到各岩性点的距离,并以距离的倒数作为权重系数对岩性识别图版进行校正,最后采用最短欧氏距离归属法识别火山岩岩性。将识别结果与有薄片鉴定岩性的6口井累计2 240 m井段进行对比,岩性解释符合率达89.2%,取得了良好的应用效果。
Effective lithology identification for igneous rocks is the key to the evaluation of igneous reservoirs.On the basis of core analysis and thin slice analysis,log responses of various igneous rocks was studied and a lithologic identification plate of igneous rocks in Kelameili Gasfield,Junggar Basin based on conventional well logs was established.It was found that there are many crossing and overlapping between the different lithologies on the plates,which affected the accuracy of lithology identification.Thus,in order to correct the error of direct plate approach,the relationship between log responses and lithologies of igneous rocks was analyzed by correspondence analysis.It was found that the GR,CNL and RD curves are the most sensitive for lithologies of igneous rocks.The distance between various logs points and lithologic points was then calculated respectively.Regard the reciprocal of distance as the weight coefficient,the lithologic identification plates were calibrated.Lastly,based on the calibrated plates,lithologies of igneous rocks were identified with the shortest Euclidean distance method.The identification results were compared with the thin slice analysis in 6 wells added up to 2240 meters well sections and the lithology interpretation coincidence rate is as high as 89.2%,which has achieved good application effect.
国家科技重大专项“准噶尔盆地深层火山岩储集体形成演化与分布预测”(2011ZX05008-003-40)、中国科学院油气资源研究重点实验室开放基金“电成像测井资料处理新方法研究及应用”(KFJJ2016-02)联合资助。