Provenance Analysis of Chang6 Oil Reservoir Set in Jiyuan Region in Ordos Basin

Key words: 
• provenance analysis /
• Chang6 oil reservoir set /
• cathodoluminescence /
• heavy minerals assemblage /
• paleosalinity analysis

Abstract: Provenance analysis is the basis and promise of depositional system and palaeogeography. To some extend provenance analysis is the reference for microfacies and sandbody distribution, sandbody forecast and evaluation. There were several ancient lands around Ordos Basin during Late Triassic, including Yinshan Old Land of the north, Alxa Old Land to the northewest, QilianQinlin Old Land of the south and Longxi Old Land of the southwest and so on. These Old Lands were the main source of the detrital sediment in the Basin. Jiyuan region locate in west of Ordos Basin in Chang6 depositional stage, Provenance analysis especially pointing out the main source orientation is significant for sedimentary facies and sandbody distribution. By the analysis of debris components, heavy minerals assemblage, lithic fragment components, cathodoluminescence image, REE, and paleosalinity recovery, it indicated that northeast were main source orientation and northwest is the subordinate source orientation of the studied area, and southwest supply sediment at the same time.