碳酸盐岩溶洞体的空间定位与体积计算

Space Location and Volume Calculation of Carbonate Karst Cave

碳酸盐岩溶洞体的空间位置与地震数据体上显示的“串珠状”地震响应之间关系的确定。以及溶洞体体积大小的计算．一直是困扰碳酸盐岩勘探开发的难题。文中采用波动方程正演模拟方法对缝洞体空间定位和缝洞体体积计算进行了探讨．明确了缝洞储层的空间定位。认为横向上溶洞位于串珠状反射的半幅点位置；纵向上溶洞顶界位于波谷。溶洞越大，其顶界越接近最大波谷。通过2组溶洞模型的正演模拟。分别得到了溶洞体的宽度校正系数图版和高度校正系数图版．在此基础上编程实现了溶洞体积校正，为溶洞型油气藏储量的准确计算提供了理论依据。以上结论与认识对提高碳酸盐岩钻探成功率、指导高效开发、实现碳酸盐岩探明储量尤其是产量的快速增长具有重要的意义。

The clear relationship between the space location of carbonate Karst cave and ＂moniliform＂ seismic resonance reflected on seismic data plus volume calculation of cave have been issues perplexing exploration and development. In this paper, the wave equation forward modeling simulation method is adopted to address location of fracture-cave space and calculation of fracture-cave space plus clearly defines the space location of fracture-cave reservoir. The Karst cave lies in the centre of moniliform laterally and the upper boundary of Karst cave lies in the wave trough vertically. The larger the Karst cave, the nearer the upper boundary to the largest wave trough. Through forward modeling of two groups of Karst cave models, the height and width correction templates of Karst caves are obtained, and based on the above results, volume correction by programming can be realized, which provides theoretical evidence for accurate reserve calculation of Karst cave oil/gas reservoir. The conclusions and understandings are of great significance in improving the success ratio of exploration drillings and guiding efficient exploration plus realizing the quick increase of proved reserve especially the production of carbonate reservoirs.