塔里木盆地轮南地区速度场的建立和应用

Establishment and application of velocity field in Lunnan area,Tarim Basin.

塔里木盆地轮南地区含油目的层系主要为中生界的三叠系和侏罗系,埋藏深,构造幅度小,速度纵横向变化大。从地震叠加速度、平均速度及层速度等方面分析了轮南地区的基本速度场特征,即平面上具有北西部高、南东部低,纵向上具有三段式的特点。其影响因素是岩性、储层物性和孔隙流体性质。讨论了砂岩储层的速度特征及其与岩性、物性和孔隙流体性质等因素的关系,建立了三维时深转换速度场,在研究区的勘探开发生产中取得了很好的效果。

The main oil-bearing layer systems in Lunnan area,Tarim Basin are Mesozoic Triassic and Jurassic with deep burial depth,small structure range and large variety of seismic acoustic velocity in the vertical and horizontal.The basic velocity field in Lunnan ar- ea,which was analyzed from the sides of seismic stack velocity, average velocity and interval velocity,has the features of high value distributes in north west and low value distributes in south east on the plane and three intervals on the vertical.The influen- eing factors include lithology,physical property and pore fluid property.Then the velocity features of sandstone reservoirs and their relationship with the influencing factors were discussed and three-dimension velocity fieht of time-depth transformation was established.The application of the new velocity fieht has made good effect in this area.