西昌盆地七里坝构造油气化探异常特征及构造含油气评价

FEATURES AND GEOCHEMICAL ANOMALIES OF OILGASIN QILIBA STRUCTURE OF XICHANG BASIN AND THE EVALUATION OF OILGAS STORAGE

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。

Xichang Basin is a continental faultsubsidence basin formed during MesozoicCenozoic Eons in Panxi region. In the basin,there exist many folds and faults and frequent magmatic activities.Which leaves the storage of oilgas in the basin open to question.Through the oilgas geochemical prospecting in Qiliba Basin,weak geochemical anomalies of oilgas were found and their features, existing forms and relation with oilgas are studied. It is shown that various anomalies objectively exist in the surface of Qiliba structure,indicating the existence of anomaly sources in the structure, from which considerable amount of hydrocarbons might have escaped.