Identification of meandering river abandoned channels in Changyuan Oilfield on 3D seismic data
Lu Mian1, Jiang Yan1, Li Cao1, Wu Gaoping2, Cai Dongmei1, Zhang Xiuli1
1. Exploration and Development Institute, Daqing Oilfield Company Ltd., PetroChina, Daqing, Heilongjiang 163712, China; 2. No.9 Production Plant, Daqing Oilfield Company Ltd, PetroChina, Daqing, Heilongjiang 163853, China
Abstract：The Bed PⅠ2 of Putaohua Reservoir is located in the dense-well pattern block of Changyuan Oilfield.Based on laterally high-density 3D seismic data and vertical high-resolution well logging data,we analyze seismic response characteristics of the abandoned channels on plans and sections with deposition information in the Hailar belt in Haotetaohai.Our abandoned channel identification approach is "directed by seismic characteristics and controlled by single-well facies" based on well logging and seismic data integration.According to mechanism of abandoned rivers,well logging and seismic response characteristics can be classified as two major categories which include four classes integrating with satellite photographic and modern outcrop data.The identification of abandoned channels is achieved in the Bed PⅠ2 of meandering river deposition in the dense-well pattern block of Changyuan Oilfield,and this identification is verified by well pattern dilution.Based on our research,the abandoned channel identification accuracy is improved by more than 11%; the abandoned channel trend and combination have controlled geometric shapes and distribution characteristics of point bars,they also affect the remaining oil distribution; the abandoned channels are mainly of crevasse and diversion in the study area,their shapes show "S" type in plans; an abandoned channel crosses the area of interest with the length of 4.8 km and the width range of 60~130m.The later development adjustment guided by our abandoned channel identification achieves satisfactory performances.
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