随机反演技术在腰英台地区储层预测中的应用

Application of Inversion Technology in YaoYingtai Area

腰英台地区目前已经进入了以构造-岩性、岩性为主的勘探阶段,储层预测技术变得尤为重要,而对于储层薄、砂地比高、砂泥岩速度差异小的地区的储层预测一直是地球物理勘探的一个难题,这也在某种程度上成为制约隐蔽油气藏勘探的"瓶颈"。本文以腰英台地区泉一段、登娄库组为研究对象,通过分析储层岩性特征,尝试了多种反演方法,发现测井约束波阻抗反演技术分辨率较低,已不能满足实际生产的需要。而随机反演充分考虑地质规律、地震和测井信息,突破地震频带宽度的限制,对储层具有较高的描述能力和分辨能力,本文采用自然伽马协模拟反演,反演结果对薄层砂体有很好的反映,也利于刻画砂体的边界。

Reservior prediction is very important in the exploration stage by the major type of lithologic --structural and lithologic reservior at Yaoyingtai area. It is a problem of geophysical exploration in the area that is the thin reservoir,high sand ratio and small velocity difference between sand and mud . It is the bottleneck of subtle oil and gas reservoirs exploration to some extent. Denglouku formation and Quan 1 section is the oboject of study in text. According the analysis the character of the reserivor ,several inver- sion method are tried. The logging constrained wave impedance inversion method has low resolution,and it carl not meet the need of production. The geological regularity , seismic and logging information are taken into account in the stochastic inversion method , and it make a breakthrough in the seismic band width limit. It has high resolution and the sand is easy to be describied in the result of inversion.