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| Prediction of oil column heights in fault-controlled tabular reservoirs through time-frequency analysis based on improved generalized S-transform |
YUAN Xiao-Man1( ), LI Xiang-Wen2,3(), ZHANG Jie1, DAN Guang-Jian2, LU Zhong-Yuan1, HAN Chong-Yang2, ZHANG Lei2, XU Jian-Yang2 |
1. China National Petroleum Corporation,PetroChina Tarim Oilfield Company,Korla 841001,China
2. BGP Inc.,China National Petroleum Corporation,Korla 841000,China
3. Optical Science and Technology(Chengdu) Ltd.,China National Petroleum Corporation,Chengdu 611730,China |
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Abstract The fault-controlled carbonate area in the northern depression of the Tarim Basin possesses abundant oil and gas resources.Identifying the oil-water contact (OWC) of fault-controlled tabular reservoirs is critical for their effective exploitation.However,OWC identification through drilling is costly and challenging.In contrast,it is efficient to identify the OWC using geophysical methods.This study proposed a time-frequency analysis method based on generalized S-transform.As revealed by the joint analysis of extensive time-frequency analysis results of through-well seismic channels and production performance analysis data,the depth/time-varying main frequency of seismic data is positively correlated with the oil layer thickness.Hence,this study proposed to identify the OWC using the abnormal inflection point of the energy envelope of seismic channel time-frequency gather.Experimental results demonstrate that oil layer thickness results obtained are uncertain,generally reliable,and reliable in the case of oil column height (OCH)<120 m,120 m≤OCH≤250 m,and OCH≥250 m,respectively.The method proposed in this study was applied to a fault fracture zone of an area of the Fuman oilfield,obtaining the main predicted oil layer thicknesses between 200 m and 520 m,aligning with the actual exploitation results.Therefore,the method of this study can be employed to guide exploitation.
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Received: 11 August 2023
Published: 27 June 2024
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3D data volume stereogram of time-frequency analysis
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Geological model of fractured reservoir with different oil layer thicknesses(a) and forward modeling results profile(b)
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fig.2b;b~f—the positions of fracture zones ① to ⑤ in fig.2 are shown respectively
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Comparison of time-frequency gathers for forward seismic data of different geological bodies
a—blue dashed line position in fig.2b;b~f—the positions of fracture zones ① to ⑤ in fig.2 are shown respectively
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| 序号 | 模型油层
厚度/m | 频谱衰减
高度/ms | 预测油层
厚度/m | 误差/% | | 1 | 0 | 6 | 18 | — | | 2 | 100 | 28 | 84 | 16 | | 3 | 200 | 60 | 180 | 10 | | 4 | 400 | 130 | 390 | 2.5 | | 5 | 600 | 195 | 585 | 2.5 |
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Comparison statistics of model oil layer thickness predicted by time-frequency analysis
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Structural distribution of the study area
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| 储集体结构 | 地震反射特征 | 测井特征 | 实钻特征 | | 电阻率/(Ω·m) | 密度/(g·cm-3) | 声波时差/(m·μs-1) | 钻井情况 | 钻时/(min·m-1) | | 裂缝—基岩段 | 连续状 | 2 000以上 | 2.7~2.8 | 50 | 见气测 | 25~40 | | 裂缝—孔洞段 | 弱连续杂乱 | 500~2 000 | 2.5~2.6 | 40~50 | 漏失无放空 | 13~25 | | 断层角砾段 | 串珠 | 40~2 000 | 2.5~2.6 | 35~45 | 漏失量较大或钻遇放空 | 5~12 |
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Identification of drilling,logging and logging characteristics of different transverse structures in strike-slip fault fractured zone
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Seismic profile characteristics of vertical fault fractured-zone(a) and amplitude attribute map of Ordovician in the study area(b)
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Comparison of cross well seismic profiles and time-frequency profiles
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Comparison between the drilling oil column height in the study area(a) and the predicted oil layer thickness using this method(b)
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Comparison chart of oil layer thickness prediction for a fractured zone in the study area
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Plan view of predicted oil layer thickness in a fractured zone(a) and the OWC(b)
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