# 利用试井双对数曲线计算缝洞型油藏动态储量的方法Method for Calculating Dynamic Reserves of Fracture-Cavity Reservoirs by Using Double Logarithmic Curve of Well Test

DOI: 10.12677/OJNS.2020.82011, PDF, HTML, XML, 下载: 143  浏览: 224

Abstract: The strong heterogeneity and complex combination of Fracture-cavity reservoirs make it diffi-cult to identify the type and size of their storage spaces. The conventional reserve calculation methods cannot accurately reflect the reserves and distribution of fracture-cavity reservoirs. Based on the static geological data and fully combined with the production data of oil wells, a dynamic reserve calculation method suitable for fracture-cavity reservoirs is established in this paper. This method takes advantage of the double logarithmic curve of welltest to reflect the characteristics of fracture and vug development and the dynamic characteristics of oil well pro-duction. The size of the reservoir body is identified through plot matching, and further dynamic reserves are obtained. The calculation results are obtained by comprehensively using static and dynamic data, which is more in line with the actual conditions of fracture-cavity reservoirs. This is of significant meaning to adjust technical policy of fracture-cavity reservoirs in different de-velopment stages.

1. 容积法在缝洞型油藏储量计算中的应用局限

2. 井–缝–单洞模型

2.1. 物理模型

Figure 1. Physical model diagram

2.2. 数学模型

(1)

(2)

(3)

(4)

(5)

3. 试井双对数曲线溶洞容积影响图版

Figure 2. Typical log-log plot of well test

Figure 3. Log-log plot of well test affected by vug volume VvD (closed outer boundary)

4. 计算缝洞型油藏储量

4.1. 计算步骤

4.2. 实例计算

Figure 4. Log-log diagnostic plot of original falloff well test

Figure 5. Initial log-log plot of well test before matching

Figure 6. Effect log-log plot of well test after matching

5. 结论

1) 缝洞型油藏非均质性强，缝洞组合关系复杂，运用容积法计算其储量有一定局限性。

2) 试井双对数曲线形态受溶洞容积大小影响，曲线可反映油藏开发过程中地层能量随时间的动态变化特征。

3) 试井双对数曲线图版拟合可有效识别储集体类型和规模，并计算油藏动态储量。

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