姬塬古高地东斜坡侏罗系油藏特征与勘探策略

Jurassic reservoir characteristics and exploration strategy on the eastern slope of Jiyuan palaeohigh

针对姬塬地区侏罗系油藏存在探井成功率较低,油藏空间变化复杂,缺少大面积连片油藏,勘探开发技术要求较高等问题,在新井钻井、物探等资料分析的基础上,对古地貌形态和标志层构造起伏进行了精确刻画,恢复了延安组沉积相和砂体展布规律。通过构造与岩性叠置的最优化靶区的预测,发现了几处侏罗系延安组油藏,总结出了油气成藏的规律,并提出了有效的勘探开发策略,为生产提供了指导,取得了显著的经济效益。

Jurassic reservoirs in Jiyuan area have low success ratio of exploration wells and complicated reservoir conditions, lack large area reservoirs, and require advanced techniques of exploration and development. Based on analysis of new well drilling and geophysical data, this paper gives a detail description of palaeogeomorphology and tectonic relief of marker bed, and presents sedimentary facies and sand distribution pattern of Yan'an formation. Optimum targets prediction through combining structure and lithology knowledge has discovered several Jurassic reservoirs in Yan'an formation, generalized the pattern of oil and gas accumulation, proposed tactics of exploration and development, and achieved notable result.