地下饱和含水沙漠区静校正技术应用及效果

Application of Static Correction Technology for Underground Saturated Water Desert Area in Tarim and Its Effect

塔里木盆地塔克拉玛干沙漠一直是塔里木油田油气勘探的重点区域之一,但由于该区沙丘起伏剧烈、风化层速度横向变化大,静校正问题较为突出。本文根据研究区高速顶界面是潜水面、沙丘的近地表速度具有连续介质的特点,有针对性地提出了有效、快捷解决问题的沙丘曲线静校正方法:在已知沙丘厚度的前提下,根据所建立的沙丘曲线量板或经验公式可以得到风化层平均速度和垂直传播时间,进而能够计算出静校正量。沙丘曲线量板及经验公式可通过沙丘调查法、微测井调查法及初至折射法建立或拟合;沙丘厚度可以按照传统的小折射、微测井调查获得,还可以采用更加环保、便利的静水面调查或静水面调查与数据库相结合的方式获得。上述方法在目标区域的应用有效地改善了剖面的成像效果,为类似的戈壁砾石区、黄土塬等区域的静校正工作提供了有益的借鉴。

The Taklimakan Desert in Tarim Basin has been one of the key areas of oil and gas exploration in Tarim oilfield, but it has a prominent static correction problem because of its dramatic ups and downs of sand dunes and the lateral velocity changes of the weathering layer in the area. Considering the feature that the high-speed top interface is diving surface and the near surface velocity of the dune has the characteristics of continuous medium in the study area, an effective and efficient solution to the sand dune curve static correction method was proposed purposely in this paper： when the thickness of sand dunes has given, the established dunes curve plate or the empirical formula can be used to get the average velocity of the weathering layer and its vertical transmission time, and then the stat- ics. Such dune curve plate and the empirical formula can be established or fitted by sand dune investigation method, micro logging survey method, and primary refraction method. The thickness of dune can be obtained according to the traditional small refraction and micro logging survey, and it can also be adopt more environmentally friendly and more convenient through the still water surface survey or through the combination of the still water surface survey and the database. The application of the above methods in the target area has effectively improved the imaging effect of the section, which provided a useful reference for the static correction work in similar Gobi gravel region and loess plateau region.