鄂多斯盆地西南缘延长组成湖盆底形成演化研究

鄂尔多斯盆地西南缘延长组具有非常丰富的油气资源， 是近年来增储上产的主要领域， 明确盆地底形的演化规律对今后的油气勘探具有非常重要的意义。通过对主要目的层的砂体堆砌样式、 半深湖—深湖区的迁移规律研究， 结合盆地大量存在的事件沉积， 表明： 上三叠统长 7 期是盆地西南缘秦岭造山最活跃的时期， 地震频繁、 火山喷发、 物源区发生隆升， 造山带前缘快速下沉， 湖盆中心迅速向西南缘迁移， 南陡北缓的不对称湖盆形成。湖盆底形由对称变为不对称、沉积相由曲流河三角洲转变为辫状河三角洲， 浊积岩、 凝灰岩、 砂岩脉的形成均与秦岭造山有密切关系。根据湖盆底形的演化规律， 认为盆地西南缘的华池—庆城—正宁地区长 7 段浊积岩砂体具有良好的油气勘探前景

A Comparative Analysis of EVA of the Three Major Oil Enterprises in China

This paper makes a comparative study on the result of EVA of the three major oil enterprises in China, analyzing the influences of the following factors on EVA ： net profits , development and exploration expenditure ,interest- bearing liabilities, and net assets. Based increasing EVA： nurturing financial management decision- making system on investment; improving timizing enterprise capital structures and so on. on the analysis, the authors present the following suggestions for concept which centers on value creation, establishing a scientific the budgeting system which centers on value management, and op-timizing enterprise capital structures and so on.