准噶尔盆地南缘油气勘探难点与对策

通过对准噶尔盆地南缘半个多世纪的油气勘探历史回顾,确定了山前勘探各个阶段所面临的主要难点:构造存在多解性、储层质量变化大与规模难以预测、高陡构造地震处理准确偏移成像难度大、钻井技术要求高。并针对主要难点提出了解决对策:正确应用断层相关褶皱理论解释山前复杂改造、开展地表—井下—地震储层与孔隙建模有效预测砂体结构与质量、利用有效构造建模指导速度建模与叠前偏移成像、开展层速度预测地层压力与钻井压力检测及快速防斜打直配套钻井技术攻关等。

Difficulties and Solution of Oil and Gas Exploration in South Margin of Junggar Basin

Based on the review of petroleum exploration in the south margin of Junggar Basin in the past half century, the difficulties of piedmont exploration in different phases are summarized as follows: complex structures; large variability in reservoir quality and difficultyin predicating its scale; inaccurate image of seismic data's migration processing in complete trough structural belts; requirement for hightechnology of drilling, etc. Moreover, a series of solution to these difficulties are brought forward: applying the theory of fold related tofault to interpret complex structural belts in piedmont; analyzing the features of the surface and underground seismic reservoir predictionand porosity model construction to predicate effectively the texture and quality of sandbodies ; using structural model to direct theconstruction of velocity model and process prestack migration imaging of seismic data; utilizing interval velocity to forecast reservoirpressure; improving the drilling technology for pressure detection and prompt protection of vertical well against incline well.