Abstract:

Since lithologic trap is the mainly continuing exploration object of Sanhu Depression, confirming the provenance and the respective influence area on the inside of the depression is the current priority task.Research thought of the provenance analysis of heavy minerals is as follows: correlation analysis determines source rock types; factor analysis determines provenance levels; Q type cluster analysis determines influence area; stability coefficient determines transportation direction.According to that thought, the whole heavy minerals data of the study area is processed.Comprehensive analysis of mathematical statistics results shows: the source rock types of work area are mainly metamorphic, medium-basic eruptive and few sedimentary rock, which respectively respond to the south Kunlun Mountain primary provenance, the north- east Aimunike Mountain secondary provenance and the north Qilian Mountain slight provenance. The south provenance not only controls the sedimentation of South Slope, also has an effect on the Sebei.Tainan Gas Field area of North Slope sedimentation which is controlled by the Kunlun Mountain-Nabei branch provenance. Northeast provenance has limited influence area which covers Yanhu, Yabaer, and Chaerhan. There is slight influence of the north provenance on the inside sedimentation of depression.

Key words: Sanhu Depression, heavy mineral, provenance analysis, correlation analysis, factor analysis, type cluster analysis, Qaidam Basin