库车复杂地表区静校正技术应用及效果

Static Correction Technology and Its Application in Kuqa Surface Area

塔里木盆地库车山地一直是塔里木油田油气勘探的重点区域之一,但是该区地表条件复杂多样,表层调查、建模困难,静校正问题突出。本文将层析反演技术扩展到表层调查领域,采用微测井约束的浅层层析表层调查方法,解决了巨厚戈壁砾石区表层调查困难的问题。同时在传统表层建模基础上,创新提出了三维立体表层建模方法,通过在In Line和Cross Line方向上对表层调查控制线的近地表结构进行精细刻画,大大地提高了表层建模的精度。不同的静校正方法都具备自身的优势和不足,在复杂区某一种静校正方法很难解决所有的问题,综合静校正技术可以较好解决这些问题,具有广阔的应用前景。以上方法的联合应用,准确剖析了研究区的表层结构,提高了剖面的成像效果,为类似区域的表层调查、建模及静校正工作提供了有益的借鉴。

Kuqa Mountain in Tarim Basin has been one of the main areas for oil and gas exploration in Tarim Basin, while this area has outstanding static correction problems for the difficulty in surface SUlveys and modeling due to its complex and diversified surface conditions. In this paper, the tomographic inversion technology was extended into the surface survey domain. It solved the difficult surface survey problems in super-thick gobi-gravel area with the uphole-constrained shallowlayer tomographic surface survey method. Meanwhile, a 3D solid surface modeling method was proposed innovatively on the basis of the traditional surface layer modeling, which precisely characterized the near-surface structure on the control lines of the surface survey in both the Inline and Crossline directions, resulting in a greatly improved surface layer modeling accuracy. Different static correction methods have their own advantages and disadvantages. One static correction method can hardly solve all the static correction problems in the complex area; hence, the comprehensive application of the static correction technologies can solve these better and has a broad application prospect. The joint application of the above methods analyzed accurately the surface structure in the area and improved the imaging effect of the section, which provided a valuable reference for the surface survey, modeling and static correction in similar areas.