Frequency-segmented seismic attribute optimization and sandbody distribution prediction: an example in North Block,Qinghuangdao 32-6 Oilfield
Li Wei1, Yue Dali1,2, Hu Guangyi3, Fan Ting'en3, Fang Xiaogang4
1. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China;
2. State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102249, China;
3. CNOOC Research Institute, Beijing 100028, China;
4. Guizhou Unconventional Resources Engineering Technology Research Center, Guiyang, Guizhou 550081, China
Abstract：Based on well logging and seismic data,some research of Minghuazhen Formation in Qinhuangdao 32-6 Oilfield is conducted.According to different seismic characteristics of thick sandbodies and thin sandbodies,we propose a new approach to sandbody prediction,which includes two steps:first choose a frequency segment,then optimize seismic attributes.For thin sandbody of Layer NmⅠ-1,we pick up attributes of high frequency seismic signals,and for thick sandbody of Layer NmⅠ-3 we pick up attributes of low frequency seismic signals.Then according to optimized seismic attributes and well interpretation,we predict sandbody distribution and sedimentary facies under the guidance of sedimentary facies model.The results indicate that the proposed approach can effectively reduce the impact of tuning thickness,and significantly improve the correlation between seismic attributes and sandbody thickness.
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