西昌盆地是攀西地区中，新生代陆相断陷坳陷盆地。盆地内断裂褶皱发育，岩浆活动频繁，对于盆地内油气保存条件的好坏一直无法定论。通过盆地七里坝构造油气化探工作，发现了油气化探弱异常，进行了化探异常特征、存在形式以及与油气的关系的研究，结果表明，七里坝构造地表的各类异常是客观存在的，该构造内存在有异常源，但异常源的烃量可能已有相当部分逸散掉了。 The Xichang Basin is a basin of Meso-Cenozoic terrigenous faulted depression in the Panxi area. In the basin, fault folds and folds are developed and magmatic activities are frequent, which has not been conclusive for the preservation conditions of oil and gas in the basin. By means of the geochemical exploration of Qiliba structure in the basin, the weakness of geochemical exploration of oil and gas are found, and the characteristics of geochemical anomalies, their existing forms and their relations with petroleum are studied. The results show that all kinds of anomalies in Qiliba structural surface are objective There is an anomalous source within the structure, but a significant portion of the anomalous hydrocarbon may have escaped.