准噶尔盆地环玛湖地区三叠系百口泉组物源分析

通过对百口泉组重矿物特征研究、古流向分析、砾石成分特征研究及地层含砂率特征研究，讨论了环玛湖地区百口泉组沉积时期的物源方面和母岩性质。采用重矿物Q型聚类分析，结合重矿物ZTR等值线图以及地层倾角测井古流向分析，指出环玛湖地区百口泉组存在3大物源体系，分别为北部夏子街物源、西部黄羊泉物源以及东部夏盐物源；通过砾岩成分以及重矿物组合类型研究，认为北部物源和西部物源成分存在差异:北部夏子街物源及夏盐物源成分以凝灰岩和中酸性火山喷出岩为主；西部黄羊泉物源成分以凝灰岩、沉积岩和花岗岩为主。西部物源中花岗岩岩屑含量较高，致使储层刚性颗粒含量高、抗压实能力强，这是西部扇体储层物性普遍优于北部扇体储层物性的原因之一。各物源方向及物源体系与扇三角洲的推进方向具有较好的一致性，因此，利用多种方法结合来划分环玛湖地区百口泉组沉积时期物源是十分有效的。

Provenance Analysis of Triassic Baikouquan Formation in the Area around Mahu Depression,Junggar Basin

By study of heavy mineral, paleocurrent direction, pebble content and the glutenite percentage, this paper discussed the provenance and the content of material source rock of Baikouquan Formation in the area around Mahu depression. By the method of Q-type clustering analysis, Paleocurrent direction analysis combine ZTR map, it shows that there are three distinct sediment sources of Baikouquan Formation in the study area:the northern Xiazijie provenance, the western Huangyangquan provenance and the eastern Xiayan provenance. The hauling distance of western provenance and eastern provenance are longer than northern provenance's. By analysis of pebble content and heavy mineral combination, it shows that there exist difference of material source rock content between northern provenance and western provenance. The content of northern provenance are primarily tuff, intermediate-acid volcanic rock, while the content of western provenance are tuff, sedimentary rock and granite. As the western provenance has higher content granite, so do the higher content hard particle, and which makes the reservoir has stronger ability to resist the compaction. The directions of different sediment sources identified are in accordance with the main building directions of fans delta. Using comprehensive analysis with several methods to identify source area in the study area is quite effective.