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沙特阿拉伯鲁卜哈利盆地B区块地表多为沙丘、戈壁,近地表地质条件复杂,横向速度变化大,静校正问题严重。B区块勘探程度低,微测井数量少,原有的近地表模型不能很好地解决资料处理中的静校正问题,给最终的处理结果带来影响。针对这一问题,在充分考虑油气勘探对数据处理的精度要求和时效性基础上,探讨了B区块近地表建模的难点,提出了一种快速近地表模型建立方法。首先将B区块划分为沙丘、戈壁和沙丘-戈壁过渡带等不同类型的近地表区域;然后根据划分结果分别采用不同的建模方法,对沙丘底面进行准确定义,对微测井空白区带的速度误差进行校正,将沙丘压实曲线应用到模型的建立中,最终获得了能准确描述B区块近地表介质特征的模型,解决了原模型在近地表速度变化区(带)、微测井空白区(带)描述中存在的问题。利用新建立的近地表模型对二维、三维地震资料进行了处理,得到了品质较好的叠加剖面。
Most of the surface of Block B in the Ruboubli Basin of Saudi Arabia is sand dunes and Gobi. The geologic conditions near the surface are complex, the horizontal velocity changes greatly, and the problem of static correction is serious. Block B has a low exploration level and a small number of micro-wells. The original near-surface model can not solve the problem of static correction in data processing well and has an impact on the final processing result. In response to this problem, based on the full consideration of the accuracy and timeliness of data processing in oil and gas exploration, the difficulty of near surface modeling in B block was discussed and a fast near surface model establishment method was proposed. Firstly, divide Block B into different types of near-surface regions such as sand dune, Gobi and dune-Gobi transitional zone, and then use different modeling methods according to the results to define the bottom of dune accurately. , The sand dune compaction curve is applied to the establishment of the model. Finally, a model that can accurately describe the characteristics of near-surface medium in block B is solved, and the model of near-surface velocity change (band), micro-measurement Well blank area (band) description of the problems. Two-dimensional and three-dimensional seismic data are processed with the newly established near-surface model, and the superposed profile with better quality is obtained.