KEY PARAMETERS FOR RESERVE EVALUATION WITH SEC VOLUMETRIC METHOD AND THEIR APPLICATION TO THE XIHU SAG, EAST CHINA SEA
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摘要:
近年来应用容积法对东海西湖凹陷新增或开发早期的油气田进行上市储量自评估，由于储量级别划分、井控含油气面积、有效厚度等关键参数取值差异，导致与第三方评估结果差异较大。因此，在西湖凹陷勘探开发实践基础上，开展SEC标准容积法评估储量关键参数确定方法研究，结果表明：SEC储量评估中要遵循合理的确定性、可靠性、方案/计划、5年开发等原则，在储量级别划分时可根据单井有效厚度、孔隙度、饱和度、采收率等各项参数的可靠程度分别选用低、中、高值，相应产生1P、2P、3P储量。综合运用试井分析法、最终技术可采储量反算、平均储采比等多种技术方法，初步确定西湖凹陷主力层气井井控半径为420～740 m，油井井控半径为330～660 m。应用等值线面积权衡法确定单元有效厚度时，要充分考虑气（油）水同层、最大油气层厚度以及构造与砂体分布特征等。研究成果在西湖凹陷N-1气田应用效果好，对新增或开发早期油气田进行上市储量评估具有一定的借鉴意义。
Abstract:In recent years, the volume method is widely used in the Xihu Sag of the East China Sea for self-assessment of newly increased reserves and the reserves found in early development stages. The results are different from different researchers due to the difference in key parameters adopted, such as reserve classification, well controlled oil-gas area, net pay etc., used for the calculation. Based on the exploration and development practice in the Xihu Sag, the determination of key parameters of SEC volume method is carefully discussed in this paper. The results suggest that some basic principles must be followed in using SEC volume method, such as reasonable certainty, data reliability, reasonable planning and a development trial over 5 years. In the classification table of reserves, low, medium and high values corresponding to 1P、2P、3P reserves should be selected according to the reliability of parameters such as net pay, effective porosity, saturation and recovery factor, etc. Based on the data from well testing, and the reversely calculated final recoverable reserves, average reserve/production ratio and other technical parameters, the control radius of a gas well for the main producing layers in the Xihu Sag is determined as 420～740 m, while the control radius for oil wells varies in the range of 330～660 m. When determining the net pay of a unit by isoline area trade-off method, full considerations should be given to the same layer of gas (oil) and water, the maximum thickness of oil-gas layer, and the distribution patterns of structures and sand bodies. With the successful application of the method to gas field N-1 in the Xihu Sag, the research results have certain significance for the reserve evaluation of newly added reserve or the oil and gas fields in early development stages.
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Key words:
- volumetric method /
- SEC criteria /
- oil-bearing area /
- net pay /
- Xihu Sag
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表 1 西湖凹陷试井解释计算压力传播范围
Table 1. Calculation of pressure propagation range by well test interpretation in Xihu Sag
油气田 层位 井名 井型 油气类型 水平段长度/m 气层长度/m 传播半径/m H-1 H4d A4H 水平井 气 1149 466.7 560 K-1 P3 A2H 水平井 气 1430 1320 420 P8 B2H 水平井 气 647 190 490 H-2 H3 A6H 水平井 气 450 150 260 P-1 P8 B-4 定向井 气 / 430 
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表 2 西湖凹陷EUR反算井控半径
Table 2. Well control radius calculated by EUR in Xihu Sag
油气田 井号 生产层位 井型 油气类型 预测方法 含油气面积/km2 有效厚度/m 采收率/% 渗透率/×10−3 µm2 井控半径/m H-1 A9M H6a 水平井 气 产量递减 0.32 12.3 40 1.6 320 A4H H4c1 定向段 气 油压递减法 0.24 8.9 60 15.2 280 A4H H4d 水平段 气 油压递减法 0.71 3.7 60 5.1 350 T-1 A10 H7 定向井 气 已停喷 0.85 6.4 60 50.3 520 A2 H5b 定向井 气 产量递减 1.12 23.2 60 6.7 600 T-3 C6H P3 水平井 气 已停喷 2.32 7.9 50 2.6 550 P-1 B5 P1 定向井 气 已停喷 1.74 17.0 55 271 740 A3H H23+4 水平井 油 产量递减 2.04 10.6 45 639 660 A7 H23+4 定向井 油 已侧钻 0.33 10.6 45 80 330
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表 3 西湖凹陷典型井平均储采比反算井控半径
Table 3. Calculation of well control radius by reserve production ratio in Xihu Sag
油气田 井号 生产层位 井型 油气类型 含油气面积/km2 井控半径/m H-1 A1H H3a 水平井 油 1.29 400 A4H H4c 定向段 气 0.81 510 A4H H4d 水平井 气 2.39 580 A6M H5 水平井 气 2.59 640 A5M H5 水平井 气 1.29 490 K-1 A1H P2a 水平井 气 2.59 670
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