Kirchhoff积分法叠前深度偏移技术在孤岛地区的应用
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摘要
潜山油气藏是胜利探区一种重要的油气藏类型,具有储集层发育、层系多、产能高等特点。但由于潜山地层经历了多期构造运动,往往多期断层交会切割,因而内幕结构非常复杂;同时埋深又比较大,这就使得常规地震剖面不能对潜山地层准确成像。以往的潜山油气藏勘探工作中的难点就在于构造的落实,Kirchhoff积分法叠前深度偏移技术正是在这种情况下发展起来的一项成像技术,它遵循波传播的Snell定律,借助于直接解程函方程的迎风有限差分三维旅行时计算方法,可以解决潜山复杂地层的成像问题。通过在孤岛地区的应用,取得了较好的效果。
The buried-hill reservoir is an important type of reservoir in Shengli Oilfield, which has characters of abundant reservoir,many strata and high production capacity. Because the buried-hill strata have experienced structural movement in different geologic period,the faults cut and intersected together which resulted in very complicated internal structure; meanwhile, the structures bury deeply,all these make ordinary seismic section can't correctly image the buried-hill strata. The difficulty of former buried-hill reservoir prospecting is determination of structure. The prestack depth migration by Kirchhoff integration is an imaging technique just developed for this situation. Following Snell rule of wave propagation and by the aid of the technique solving directly eikonal equation for calculating 3-D travel-time by up-wind finite-difference method,the method can solve the imaging problem in complicated buried-hill strata. Application the method in Gudau area shows a good result.
The buried-hill reservoir is an important type of reservoir in Shengli Oilfield, which has characters of abundant reservoir,many strata and high production capacity. Because the buried-hill strata have experienced structural movement in different geologic period,the faults cut and intersected together which resulted in very complicated internal structure; meanwhile, the structures bury deeply,all these make ordinary seismic section can't correctly image the buried-hill strata. The difficulty of former buried-hill reservoir prospecting is determination of structure. The prestack depth migration by Kirchhoff integration is an imaging technique just developed for this situation. Following Snell rule of wave propagation and by the aid of the technique solving directly eikonal equation for calculating 3-D travel-time by up-wind finite-difference method,the method can solve the imaging problem in complicated buried-hill strata. Application the method in Gudau area shows a good result.
引文
[1]陈生昌等.稳定Born近似叠前深度偏移方法.石油地 球物理勘探,2001,36（3）:291～296
[2] Schnereer Jr W A. Robust and efficient upwind finite-difference traveltime calculation in three dimension. Geophysics, 1995,60(4): 1108-1119
[3] 马在田.地震成像技术,石油工业出版社,1989
[4]马在田等.计算地球物理学概况.同济大学出版社,1997
[2] Schnereer Jr W A. Robust and efficient upwind finite-difference traveltime calculation in three dimension. Geophysics, 1995,60(4): 1108-1119
[3] 马在田.地震成像技术,石油工业出版社,1989
[4]马在田等.计算地球物理学概况.同济大学出版社,1997
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