顺南地区奥陶系碳酸盐岩储层地震识别与评价

Seismic identification and evaluation of Ordovician carbonate reservoir in Shunnan area

顺南地区碳酸盐岩储层类型多、埋深大,储层规模、空间分布及发育程度复杂,区内钻井少,地震资料信噪比相对较低,储层识别与评价难度大。针对研究难点,首先,基于研究区内钻井、测井、地震和地质资料,进行了岩石物理参数特征分析,建立了符合地下实际情况的地震地质模型,通过正演模拟研究了碳酸盐岩储层的地震波场特征,建立了不同类型储层的地震识别模式;其次,开展不同类型储层的地震敏感参数分析,明确了不同尺度储层的预测方法以及小断层、裂缝的识别方法;最后,综合储层、断层及裂缝、油气等预测结果开展含油气储层发育区评价,优选有利区带及勘探目标。结果证明,采用上述思路对顺南地区碳酸盐岩储层进行识别与评价是有效的。

The carbonate reservoir of Shunnan area is characteristized by multiply types, deep burial depth, large reservoir scales, complex space distribution and development degree, few drilling wells and relatively lower SNR of seismic data and difficult for the reservoir identification and evaluation and evaluate. Aimed at the research difficulties, firstly, based on the drilling Jogging, seismic and geology data, the petrophysical parameters are analyzed; then, the seismic-geologic model is built which is coinciding with the actual underground situation, and the seismic wavefield features of carbonate reservoir is studied with forward modeling. On the ba-sis, identification patterns of different reservoir types are established.Secondly, we carry out the analysis and experiments on seis-mic sensitive parameters to different types of reservoir, the prediction methods for different scales of reservoir and the detection methods for micro-faults,fractures are determined.Finally, we conduct hydrocarbon reservoir evaluation with comprehensive utili-zation of reservoir identification,fractures detection results and hydrocarbon prediction results,and favorable area and exploration targets are selected optimally. Carbonate reservoir recognition and evaluation are proved available in Shunnan area.