基于零井源距VSP资料的井地联合溶洞定位方法研究及应用

发布时间：2018-02-03 15:00

本文关键词： 碳酸盐岩储层 VSP 井地联合速度场溶洞定位直接钻遇率　出处：《地球物理学进展》2017年06期 　论文类型：期刊论文

【摘要】：为了确定碳酸盐岩地区目标井钻头前方缝洞体的空间位置,提出一种基于零井源距VSP资料的井地联合溶洞定位方法,提高缝洞型碳酸盐岩储层直接钻遇率.该方法主要利用钻井过程中获得的准确VSP速度修正地震三维速度场,对井区一定范围内的地震三维资料进行重新叠前深度偏移处理.通过零井源距VSP资料标定老三维地震资料(原定井位的三维地震)和新处理的三维地震资料,对比解释新、老三维地震资料,确定溶洞的空间位置变化.实时提供钻井靶心坐标,提高中靶精度.目前该方法已经在塔里木盆地塔北碳酸盐岩地区得到验证,并在塔中碳酸盐岩地区成功应用4口井,4口井在钻井期间均发生不同程度的放空和漏失,取得了较好的应用效果.该方法的成功应用为提高缝洞型碳酸盐岩储层直接钻遇率提供了一条新思路.
[Abstract]:In order to determine the space position of the fracture-cavity body in front of the drill bit in carbonate area, a method of joint hole location based on zero-well source distance (VSP) data is proposed. This method mainly uses the accurate VSP velocity obtained during drilling to correct the seismic 3D velocity field. The 3-D seismic data in a certain range of wells are processed by pre-stack depth migration. The old 3-D seismic data are calibrated by zero-well source-distance VSP data (3-D seismic at the original well location). And newly processed 3D seismic data. The new and old 3D seismic data are compared and interpreted to determine the spatial change of karst cave. The real-time coordinate of drilling target center is provided to improve the accuracy of middle target. At present, this method has been verified in the carbonate rock area of Tarim Basin in the north of Tarim Basin. And the successful application of 4 wells and 4 wells in the carbonate rock area in the middle of Tarim Basin has occurred in varying degrees of emptying and leakage during drilling. The successful application of this method provides a new way to improve the direct drilling rate of fractured and cavernous carbonate reservoirs.
【作者单位】：中国石油集团东方地球物理公司新兴物探开发处;中国石油集团东方地球物理公司研究院;
【基金】：国家十三五重大专项“随钻地震波测量技术及高温随钻测量装备研制”(2016ZX0502000)资助
【分类号】：P631.815;P634.5
【正文快照】： 岩厚度分布极不均匀,导致速度很难精确的求取.受此影响,0引言基于常规方法的叠前偏移资料很难准确还原缝洞的真实位塔里木盆地碳酸盐岩储层主要以裂缝、裂缝孔洞、洞穴置,以此为基础确定的井位大多出现了偏差(彭更新等,型储层为主,储层纵横向非均质性很强(朱光有等,2011;龚201

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