Reef-bank body reservoir prediction method for Suining high zone in Changxing Formation, Sichuan Basin
YAO Jun1, CHEN Xiangzhong2, ZHOU Gang3, TAN Kaijun1, LE Xingfu1, and XU Liang3
1. Northwest Branch, Research Institute of Petroleum Exploration & Development, PetroChina, Lanzhou, Gansu 730020, China; 2. School of Resources and Environmental Engineering, Shandong University of Technology, Zibo, Shandong 255000, China; 3. Research Institute of Exploration and Development, Southwest Oil & Gas Field Company, PetroChina, Chengdu, Sichuan 610000, China
Abstract：At present, the identification and reservoir prediction of reef-bank bodies are generally based on well-seismic response characteristics, sedimentary or paleogeomorphic background, and seismic interpretation. The reef-bank bodies are identified according to the changes in seismic reflection characteristics, seismic attributes (amplitude, frequency, and phase), and wave impedance by using technologies such as forward modeling, seismic facies analysis, seismic attribute analysis, paleogeomorphic restoration, and seismic inversion. However, the above methods have poor identification effect on reef-bank bodies with small thickness and unobvious seismic waveform characteristics and have high requirements on the quality of drilling and seismic data due to the limitation of acquisition time, location, line spacing, processing parameters, and other factors of two-dimensional seismic data. Therefore, this paper carries out a study following the sequence of Changxing Formation distribution, reef-bank body distribution, and reef-bank body reservoir distribution and predicts in two steps the reef-bank body reservoir distribution in Suining high zone in Changxing Formation of Upper Permian in Sichuan Basin based on previous research results. First, the reef-bank body is identified, and the distribution characteristics of the reef-bank body are defined by analyzing the seismic response characteristics of the reef-bank body and utilizing seismic facies identification, paleogeomorphic restoration, etc. Second, the reef-bank body reservoir is predicted, and the distribution of the reef-bank body reservoir in Suining high zone is accurately predicted by analyzing the seismic response characteristics of the reef-bank body reservoir through forward modeling and employing seismic attribute analysis and seismic inversion. The prediction results show that the reef-bank body in Suining high zone is large in scale, with three rows of reef-bank bodies developed, and these reef-bank bodies are distributed in echelon from northwest to southeast. Furthermore, their reservoir development is jointly controlled by the ancient landform and the distance between the reef-bank body and the Wusheng-Pengxi Sag, and the reservoir gradually develops from southwest to northeast. In addition, the heterogeneity of the reef-bank body is strong, and its reservoir distribution is uneven.
姚军, 陈祥忠, 周刚, 谭开俊, 乐幸福, 徐亮. 四川盆地长兴组遂宁高带礁滩体储层预测方法[J]. 石油地球物理勘探, 2023, 58(1): 196-205.
YAO Jun, CHEN Xiangzhong, ZHOU Gang, TAN Kaijun, LE Xingfu, and XU Liang. Reef-bank body reservoir prediction method for Suining high zone in Changxing Formation, Sichuan Basin. Oil Geophysical Prospecting, 2023, 58(1): 196-205.
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