莺歌海盆地高温超压区“甜点”储层地球物理预测方法

"Dessert" Reservoir Prediction by Geophysical Method at High Temperature and Overpressure District of Yinggehai Basin

莺歌海盆地近期的勘探主要面向深层高温超压储层,该区钻遇到的波峰强亮点储层获得了重大的油气发现,但该类型储层普遍为低孔低渗储层,如何寻找"甜点"储层是该区研究的重点。因此,首先,研究该区"甜点"储层的地震响应特征,确定该区"甜点"储层表现为暗点特征,以Ⅱ类AVO异常特征为重要标志;然后,构建NFP属性识别和预测具有Ⅱ类AVO异常的"甜点"储层;最后,以L12区实际地震资料进行"甜点"储层识别和雕刻,并应用叠前反演方法对雕刻出来的"甜点"储层进行含气性检测。结果显示,该区"甜点"储层集中发育并具有明显的低纵横波速度比特征。该方法为莺歌海盆地深层"甜点"储层的搜寻提供了有效途径,并为该区下一步勘探布井提供了方向。

The high temperature and overpressure district is the main district in recent exploration of Yinggehai Basin, where important gas-reservoirs are discovered. However, the low-porosity and low-permeability reservoir in the study area constrains the "dessert" reservior discovery.In this research, we study the rock physical features and the seismic response features of "desserts", and identify the weak amplitude of the "dessert" and Ⅱ AVO features. Then, we develop a new reservoir identification and prediction technology to engrave effectively the Ⅱ AVO. Finally, we apply the real seismic data to identify and predict the "dessert". The study shows that the "dessert" has the low vp/vs feature by prestack inversion, which is the response of gas-reservoir. This study provides an effective way to find the "dessert" in Ledong high temperature and overpressure district, and also the direction for the following exploration of Yinggehai Basin.