海上大斜度井井间地震技术及应用——以渤海海域K油田为例

Crosswell seismic technology of highly deviated well and its application: a case study of K oilfield in Bohai sea area

井间地震可以获得极高分辨率的地震信号,得到井间构造与储层等小尺度地质目标的精细成像,在解决油藏开发问题方面具有明显的精度优势.目前,直井井间地震技术相对成熟,但是海上油田的井多为大斜度井,大斜度井井组之间存在共面性差、井间距远的难题.本文针对大斜度井井间采集条件差的问题,以具有复杂井组条件的渤海海域K油田为靶区开展研究,提出了针对斜井井间地震的采集分析和数据处理方法,通过选取具有不同采集条件的井组开展井间地震试验,总结了获得高品质井间地震资料的条件.本文方法在渤海K油田获得了高品质的井间地震资料,开展的低序级断层解释和薄砂体精细刻画研究较好解决了油田开发中遇到的难题.本文研究成果可为后续大斜度井井间地震工作的开展提供借鉴.

Cross-well seismic can obtain very high resolution seismic signal, which can provide fine image of small scale geological targets such as inter-well formation structure and reservoir. It has obvious advantages in solving the problem of reservoir development. At present, cross-vertical well seismic technology is relatively mature. However, most of the wells in offshore oil fields are highly-deviated wells,and there are many problems in the highly-deviated wells group, such as poor coplanarity and far inter-well distance. In this paper,the research on the problem of poor acquisition condition of highly-deviated wells of K oilfield is carried out,and the method of acquisition analysis method and data processing method is presented. In Bohai K oilfield,the cross-well seismic tests of different conditions well groups are carried out and the favorable acquisition condition for obtaining high quality cross-well seismic data is summarized. High quality cross-deviated well seismic data is obtained using the method in this paper. The data is used for low-grade fault interpretation and fine characterization of thin sand bodies,which solved the problems encountered in the oil field development. The study can provide references for the follow-up cross-deviated well seismic study.