川东西河口潜伏构造实钻地震跟踪研究及认识

STUDY AND UNDERSTANDINGS OF REAL DRILLING AND SEISMIC TRACKING OF XIHEKOU BURIED STRUCTURE IN EASTERN SICHUAN

西河口潜伏构造属川东高陡构造区凉水井构造带东南陡翼断层下盘潜伏构造,先后进行了4轮地震资料重新处理构造解释,并针对石炭系目的层布井9口,但由于构造的复杂性,有4口井失误,有3口井实行动态大井斜变轨,其靶心构造形态的多解性仍同样可能存在。文章从地震资料方面入手,结合川东高陡构造及区内实钻和跟综井的显示情况,对西河口潜伏构造在地震剖面时间域—深度域的构造纵、横变异及地震资料的对比解释要点进行了论述,取得了好的效果。

Xihekou buried structure is a foot-wall buried structure of the southeastern steep flank fault in the Liangshuijing structural belt in the steep tectonic province, eastern Sichuan basin. Four rounds of seismic reprocessing and structural reinterpretation have been successively performed and 9 exploration wells were drilled with the Carboniferous as the target. Because of the complexity of the structures, 4 of the 9 exploration wells missed their target, and the trajectories of 3 exploration wells were dynamically changed in large deviation, however ambiguity still possibly exists in the structural form of the targets. Beginning with the seismic data and in combination with the real drilling data and the data of the tracking wells in the steep tectonic province in the eastern Sichuan basin and in the working area, this paper discusses the vertical and lateral variations of the Xihekou buried structure in the time-depth domains of seismic profiles, and presents the essentials of comparative interpretation of the seismic data. Good effects have been achieved.