多参数聚类技术在川东北生物礁预测中的应用

Application of multi-parameter clustering analysis for reef prediction in the northeast Sichuan province

（四川石油管理局地球物理勘探公司，四川成都610212）

Geophysical Prospecting Company of Sichuan Petroleum Administration, CNPC, Chengdu 610212, China

川东北QLB构造位于广旺海槽东边的台地边缘礁滩组合相区，根据钻井、测井和地震资料分析结果，采用多参数聚类分析技术对QLB构造生物礁的分布范围及厚度变化进行了预测。首先通过统计QB101井测井曲线和井旁道生物礁层段的地震属性信息，建立过井地震剖面的属性响应特征，确定出样本井的属性参数值；然后在一定的范围内搜索这些样本值，从而得到需要预测的生物礁信息。预测结果表明，QLB生物礁为堤礁，厚度60多m，面积约46.5km2。根据预测结果确定了QLB2井生物礁钻探坐标，结果在地震预测的靶心处成功地钻遇了生物礁，厚度55m，有效厚度约30m，获工业性气流。

The QLB structure of northeast Sichuan province is located in the reef flat facies of the platform edge in the east of Guangwang trough. According to the analysis of drilling, logging and seismic data, the multi-parameter clustering analysis has been applied to predict the changes of the distribution and the thickness of the reefs. Firstly, using the statistical parameter information of logging curves and the information of well QLB101 and the seismic attributes from the traces beside the wells in reef sections, the attributes response characteristics of seismic profiles crossing the wells were established, and the parameter values of the sample well was identified. Then, the information of the reefs to be predicted was found out by picking up the sample values in a certain range. The prediction results show that the reef in QLB region is barrier reef with the thickness of above 60 m and the area of about 46.5km2. The reef target coordinate of QLB2 well was proposed according to the prediction results. The reef had been drilled in the predicted target center. The drilled reef is 55m in thickness and about 30 m in effective thickness. Industrial oil flow has been obtained in this well.