体积积分法在油气藏评价中的应用 ——以伊拉克哈法亚油田为例

油气藏评价通常采用容积法,储集层体积是由含油气面积与地层有效厚度直接相乘来获得,这忽视了圈闭构造形态变化的影响。现提出采用体积积分法计算储集层体积并对油气藏进行评价,目的是使用更接近真实值的储集层体积,获得更准确的油气资源量。通过对伊拉克哈法亚油田上白垩统Tanuma组油藏深入研究,结合地震资料和井资料,建立了基于储集层构造图的体积积分法模型。同时,将容积法中含油气面积和有效厚度两个参数分别取大、中、小值,形成了9种组合结果。通过对比发现,体积积分法结果和容积法评价结果中值或平均值非常相近。本研究认为,体积积分法计算结果能够反映圈闭构造形态的变化,与容积法相比确定性更大;而容积法取值更灵活,能更好地反映油气藏资源量范围。

The Application of Volume Integral Method in Petroleum Reservoir Evaluation

In the process of oil and gas reservoir evaluation using volumetric method, the reservoir volume is obtained by multiplying directly the hydrocarbon-bearing area and effective thickness, while the influence of trap structural morphology is ignored. In this study, the volume integral method is used to obtain the reservoir volume and to evaluate the oil and gas resource with the purpose of getting more accurate reservoir resources by using the rock volume closer to the true value. The Halfayah oilfield of Iraq with abundant data is selected as the research area, the reservoir of which is upper cretaceous Tanuma formation. Seismic data was interpreted and lots of wells were analyzed, which was used to outline the structure contour and build up model of volume integral method. The oil reservoir evaluation was also completed by volumetric method, in which the two parameters of petroleum bearing area and effective thickness were taken as big, medium and small value respectively and 9 combinations were formed. By comparison, the result of volume integral method is very close to the median value or average value of the evaluation result of volumetric method. Finally, it is believed that the volume integral method can reflect the variation of trap form and is more deterministic, while the volumetric method can reflect the range of oil and gas volume and is more flexible.