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酒西盆地已有半个多世纪的勘探历程 ,发现了 6个油田 ,探明石油储量约 1× 10 8t。但是对该盆地石油地质特征的认识仍然不高。通过对酒西盆地最新地震资料的解释发现 ,青西坳陷不是以往认为的整体坳陷 ,内部可划分为 3个次一级构造单元 ,两凹 (青南凹陷和红南凹陷 )夹一凸 (青西低凸起 )是其基本构造特征。青西坳陷下白垩统烃源岩主要形成于半深湖—深湖沉积环境下发育的湖侵体系域 ,虽然分布面积不大 ,但厚度很大 (在青南凹陷和红南凹陷均超过 2 5 0 0m) ,主要烃源岩赤金堡组和下沟组及中沟组是很好的烃源岩 ,有机质丰度高 ,平均有机碳含量为 1%～ 2 % ,平均热解生油潜量达 6～ 8mg/g ,氯仿沥青“A”和总烃的含量分别为 1.5‰和 0 .9‰ ,有机质类型以Ⅱ型和Ⅰ型为主 ,显微组分组成中富氢显微组分含量高 ,具有高的成烃潜力。青西低凸起西北侧的红南凹陷是生油凹陷 ,构造位置十分有利 ,青西坳陷中部应是酒西盆地深入勘探的主要目标区。图 4表 3(王孝陵摘 )
With more than half a century of exploration, the West Sichuan Basin has discovered six oil fields with proven oil reserves of about 1 × 10 8 t. However, the understanding of the petroleum geological characteristics of the basin is still not high. Based on the interpretation of the latest seismic data in the Jiuxi basin, it is found that the Qingsi Depression is not an integrated depression previously thought, and the interior can be divided into three sub-first-order tectonic units. The two concave (Qingnan and Hongnan sags) Qingxi low bump) is its basic structural features. The Lower Cretaceous source rocks in the Qingxi Depression mainly formed in the lacustrine system tract developed in the semi-deep lacustrine-deep lake depositional environment. Although the distribution area is small, they are very thick (over 2 in both the Qingnan and Hongnan sags 5 0 0m). The main source rocks, such as the Chijinbao Formation and Xiagou Formation and Zhonggou Formation, are good source rocks with high organic matter abundance and an average organic carbon content of 1% -2%. The average pyrolysis potential oil potential The content of chloroform bitumen “A” and total hydrocarbon were 1.5 ‰ and 0.9 ‰, respectively. The organic matter types were mainly type Ⅱ and type Ⅰ, and the content of hydrogen-rich microscopic components High content, high hydrocarbon potential. The Hongnan depression on the northwestern side of Qingxi low relief is oil-bearing depression, and the tectonic location is very favorable. The central Qingxi depression should be the main target area for deep exploration in Jiuxi basin. Figure 4 Table 3 (Wang Xiaoling Abstract)