塔里木盆地奥陶系碳酸盐岩复杂油气藏的特性

Characteristics of the complex Ordovician carbonate reservoirs in the Tarim Basin

油藏地质与开发地质综合分析表明,塔里木盆地奥陶系碳酸盐岩油气藏具有不同于常规油气藏的特性,具有油气分布的广泛性、油气性质的多样性、油气聚集的成层性与非均质性、油气产出的不稳定性等特性。储层强烈的非均质性、油气成藏与调整的多期性是形成油气藏特殊性的两大基本地质条件。塔里木盆地奥陶系大面积含油气、油气水分布复杂、少数高产稳产井支撑大部分产量的特殊碳酸盐岩油气藏具有普遍性,需要采取针对性的勘探开发一体化组织方式。

Multidisciplinary analyses of reservoir geology and exploitation geology reveal that the Ordovician carbonate reservoirs in Tarim Basin are different with conventional reservoirs.They feature in extensiveness of oil/gas distribution,diversity of oil/gas property,layering and heterogeneity of hydrocarbon accumulation,and instability of oil/gas production.There are two basic geological conditions controlling the formation of these special reservoirs,namely great reservoir heterogeneity and multi-phase hydrocarbon accumulation and late modification.The special carbonate reservoirs that have large oil/gas-bearing area,complex oil/gas-water contacts and a small amount of wells with high and stable production contributing to bulk of the oil/gas production are common in the Ordovician carbonates in Tarim Basin.Therefore,an integrated exploration and development strategy should be employed.