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| Logging-seismic data combined identification technology for meandering river and its application: a case study of the western slope area of Daqing Placanticline |
| YANG Chunsheng1,2, YANG Huidong2, YANG Yingbin2, CHEN Baoyu3, ZHANG Xiuli2 |
1. School of Earth Sciences, Northeast Petroleum University, Daqing, Heilongjiang 163318, China;
2. Exploration and Development Institute, Daqing Oilfield of CNPC, Daqing, Heilongjiang 163712, China;
3. Daqing Oilfield of CNPC, Daqing, Heilongjiang 163712, China |
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Abstract The Sa I Formation of the Sartu oil layer in the western slope area of Daqing Placanticline is taken as an example for research in this paper. As high-density three-dimensional (3D) seismic data has rich horizontal information, and logging data has a high vertical resolution, the two are combined for application. Guided by the four typical patterns of the modern deposition of the meandering Hailar River, the combination method of logging and seismic data is used to analyze the response characteristics of the point bars and the abandoned river channels of the meandering river on the seismic profiles and build the corresponding seismic response models. Since the conventional frequency-division interpretation technology is limited to the frequency-division interpretation with a short time window, the frequency-division wavelet transform algorithm is introduced into the frequency-division calculation of seismic data to convert the seismic data from the time-domain data volume to the frequency-domain data volume. The "RGB attribute fusion technology based on the frequency-division wavelet transform" is applied to identify the point bar boundary, internal abandoned river channels, and the variation zone of the meandering river, and the distribution characteristics of the point bars and the abandoned river channels are accurately predicted. Moreover, the relationship between the length and width of a single lateral deposit in the ancient channels and the full bank width of the river is established for the first time by the seismic reservoir prediction results. The correlation coefficient is more than 0.9, which provides an accurate geological basis for heavy oil development in the western slope area. The results show that the abandoned river channels in the study area are in an “S” shape on the plane, and four typical patterns corresponding to the modern meandering river deposition are precisely identified on the plane. In this way, the fine identification and plane combination of the abandoned river channels in Sa Ⅰ 1 are completed. The recognition results of abandoned river channels and point bars are used to guide the deployment of 197 wells, of which 99 vertical wells have a success rate of 100%, and 98 horizontal wells have an average drilling range of 426 m in the horizontal section, and the drilling rate of oil-bearing sandstone in the horizontal section is 92.6%. The seismic data interpretation results are used for the large-scale deployment of nearly 100 horizontal development wells for the first time.
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Received: 27 April 2022
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2023, Vol. 58 
