Keywords Ordos basin;Triassicm;Yanchang formation;deposition system;delta;sedimentary facies;petroleum deposit;turbidite fan;sand bodies distribution;potential area;

• 鄂尔多斯盆地;三叠系;延长组;沉积体系;三角洲;沉积相油藏;浊积扇;砂体展布;有利相带;