Application of multivariate statistic analysis in geology：A case of provenance analysis in the M Strata, Huizhou Depression
Yu Ye1, Zhang Changmin1, Li Shaohua1, Zhu Rui1, Du Jiayuan1,2, Wang Li3
1. MOE Key Laboratory of Exploration Technologies for Oil and Gas Resource, School of Geosciences, Yangtze University, Wuhan 430100;
2. Shenzhen Branch of CNOOC Ltd., Guangzhou 510240;
3. Shengli Production Plant of Shengli Oilfield, SINOPEC, Dongying, Shandong 257061
Based on the heavy minerals content of 29 drilled wells,the boundary of the sediment source area and the type of the mother rock in the M strata of the Huizhou Depression of the Pearl River Mouth Basin was recognized by Q-type cluster analysis and factor analysis. Determined by the boundary of the distinct sediment source area,the sediment source characteristics in the M strata of the Huizhou Depression of the Pearl River Mouth Basin was analyzed making use of ZTR index and ZTR isoline. The results show that there are three distinct sediment source areas in the M strata in the study area:The northeast-northern sedimentary area,the northwest sedimentary area and the southeast sedimentary area. The heavy mineral characteristics of different sedimentary areas are very obvious,and the primary source and the secondary source of different sedimentary areas are easy to identify. As a whole,the types of the mother rock are complex. The types of the mother rock in the northeast-northern area are mainly acidic magmatic rock,metamorphic rocks and sedimentary rocks are secondary; there are mainly neutral-basic magmatic rock in the northwest area,the acidic magmatic rock and metamorphic rocks are secondary; there are mainly neutral-basic magmatic rock in the southeast area,the metamorphic rocks are secondary. The principal source of detritus in the northeast-northern and northwest sedimentary area was derived from the distal sedimentation,and the principal source of detritus in the southeast sedimentary area was derived from proximal sedimentation. The source of the northeast-northern sedimentary area came from north direction and northeast direction while the source of the northwest sedimentary area came from northwest direction and the source of the southeast sedimentary area came from southeast direction.