准噶尔盆地西北缘哈山构造带速度建场方法研究

Research on Velocity-field-built Method for Hashan Structural Belt in the Northwestern Margin of Junggar Basin

准噶尔盆地西北缘哈山构造带,是胜利油田西部具有较大勘探潜力的地区。但由于该区位于准噶尔盆地与和什托洛盖盆地之间的山前褶皱带,构造变形强烈,逆冲推覆使得不同时代的地层重复,造成地层速度在横向和纵向上变化较大,严重制约了该区基础油气地质方面的研究。从速度谱基准面统一校正方面入手,结合测井、VSP(垂直地震剖面)测井等基础资料,通过制作合成记录进行层位标定与解释,建立该区高精度空间速度场。通过对其速度变化的规律研究,结合油气地质特点总结了一套符合该区的变速成图方法,较好地解决了制约该区油气勘探的瓶颈问题,为其油气勘探的突破起到了重要的作用。

Hashan Structural Belt in the northwestern margin of Junggar Basin was one of the areas of exploration with higher potentiality in the western Shengli Oilfield.As the research area was located in piedmont fold belt between Junggar Basin and Shituoluogai Basin,the tectonic deformation was intensive and different ages of formation repeat were induced by thrust-nappe,by which great variation of horizontal and vertical velocities of formation was caused,the basic oil and gas geological research was seriously restricted in the research area.Beginning with correction of the uniform velocity datum,combined with logging,VSP logging and other basic data,synthetic seismogram was used for horizon calibration and interpretation,a spatial velocity field with high precision was established in the researched area.Based on the research on velocity variation law,along with hydrocarbon geological characteristics,a set of variable velocity mapping methods are summarized for solving the bottleneck problem that restricts hydrocarbon exploration,and it plays an significant role for the breakthrough of oil exploration in the researched area.