LINEAR DIMENSION-REDUCING MAPPING METHOD TO IDENTIFY THE LITHOLOGY OF VOLCANIC ROCKS

With the increasing demand for the resources of oil and gas,the development and exploration of volcanic rock reservoirs gradually become the new increase of the output.The study of volcanic rock lithology is the basis of volcanic rock reservoirs.Common methods in identifying volcanic lithology are not very effective.The principal component analysis method has been used to simply identify the lithology of volcanic rocks,and the results are good,but when the information of texture is included in the rock's name,this method is not very effective.The Linear dimension-reducing mapping method is applied to the volcanic rocks samples based on rock slices,whole rock analysis and logging traces.By this method,andesite,basalt,rhyolite and rhyolitic tuff are indentified and classied well.Compared with the method of principal component analysis,the method achieves much better results and it can separate rhyolite from rhyolitic tuff which is very difficult to be divided in the principle component analysis method.