碳酸盐岩缝洞体横向最小可分辨距离定量分析

Quantitative Analysis on Minimum Lateral Resolution Range of Fracture-Cave Bodies in Carbonate Rocks

定量分析缝洞体横向最小可分辨距离是碳酸盐岩缝洞型油气藏勘探开发过程中的一个实际问题。利用双聚焦理论推导出空间子波函数,分别依据瑞雷准则和雷克准则,在理论层面上分析了横向最小可分辨距离,认为点散射体横向最小可分辨距离可近似认为是空间子波主瓣宽度的1/2,其数值与地震波波长呈正比,与最大出射角的正弦值呈反比。从实际应用的角度,开展了地震物理正演模拟研究,为实际生产提供了缝洞体横向最小可分辨距离的精度依据。

Quantitative analysis on fracture-cave bodies＇ lateral minimum resolution range is a practical problem for the prospecting anddevelopment of fracture-cave carbonate reservoirs.This paper derives a spatial wavelet function using the double-focusing theory,analyzesthe minimum lateral resolution range based on criteria of Rayleigh and Rickers theoretically.It is considered that the minimum lateral reso-lution range of point scatterer could be 1/2 of the main lobe width of the spatial wavelets approximately,whose value is proportional to seis-mic wave length and shows an inverse correlation with the sine value of the maximum emergence angle.Seismic forward modeling is per-formed from the perspective of practical application,which provides a precision basis of the minimum lateral resolution range of fracture-cave bodies for actual production.