The depocenter of Cambrian-Ordovician lay in Awati sag and Tanggubasi sag, in which source rocks with high abundance of organic matter, good types and high maturity were developed.

• 寒武－奥陶系沉积中心在阿瓦提凹陷和塘古巴斯凹陷，有机质丰度高、类型好、成熟度高，是该区主要油气源岩。