The Correction of Correspondence Analysis to the Lithologic Identification Plate of Igneous Rocks in Huanghua Depression

In Huanghua Depression igneous reservoir is widely developed both in the vertical and horizon direction.Its lithologies are very complex,so it's always difficult to identify the lithologies of igneous rocks for geologists.On the basis of core observation and thin slice analysis,log response of various igneous rocks was studied,and a lithologic identification plate of igneous rocks based on conventional well logs in Huanghua Depression was established.In view of the limited types of available well logs and the overlapping regions in plates,in order to identify the lithologies of igneous rocks more accurately and effectively,the relationship between log response and lithologies of igneous rocks by correspondence analysis was firstly analyzed.The sensitivity coefficient of well logs for various igneous rocks(represented with the right value) was then calculated,and the sensitivity of well logs for various igneous rocks was established.Then the lithologic identification plate of igneous rocks with the right value of correspondence analysis combined with the log response of various igneous rocks was corrected.After validation,the result of correction to lithologic identification plate of igneous rocks by correspondence analysis obtained very good effect in Huanghua Depression.