2. 中国地质调查局地球物理调查中心，河北廊坊065000;

3. 中法渤海地质服务有限公司湛江分公司，广东湛江524057;

4. 重庆科技学院石油与天然气工程学院，重庆401331

2. Geophysical Centre，China Geological Survey，Langfang 065000，Hebei，China;

3. Zhanjiang Branch of China France Bohai Geoservices Co.，Ltd.，Zhanjiang 524057，Guangdong，China;

4. School of Petroleum Engineering，Chongqing University of Science and Technology，Chongqing 401331，China

and high-frequency rocks and their logging identification characteristics were determined，and the workflow of rock identification was further established． There are 14 types of rocks developed in the basement buried hill within the

YL8 area，which can be summarized into 2 major categories and 4 subcategories，mainly including syenogranite，monzogranite，monzonite，dike and fractured granite． The ( K + Na) － Si discriminant chart could separate intermediate

intrusive rocks from the basement rocks，while the weathered igneous rocks and acid intrusive rocks can be distinguished using the total amount of clay--Si discriminant chart． The syenogranite and monzogranite could be separated

according to the discriminant chart of plagioclase--Si． Finally，the rock types of basement buried hill in the YL8 area could be identified quickly in field drilling operation，combined with the results of the core，cutting and thin-section observation．