碳酸盐岩油气藏的断裂改造作用——以塔里木盆地为例

多旋回盆地油气藏形成后多经历复杂的构造改造作用，并对油气的保存与分布具有重要的控制作用。结合塔里木盆地油气藏实例分析，将碳酸盐岩油气藏断裂改造作用划分为断裂切割改造、断裂抬升改造、断裂褶皱改造、断裂再活动改造与断裂成岩封闭改造等5种类型。断裂改造方式主要有圈闭变化、盖层减薄、水力作用、压力变化与成岩变化等，并造成油气逸散与补充、水洗与降解及流体性质的变化等，从而导致碳酸盐岩油气藏与油气分布的复杂性。断裂改造作用研究对多旋回油气盆地勘探开发具有重要借鉴意义。

The fault modifications on carbonate hydrocarbon accumulation: A case study in the Tarim Basin

The oil and gas reservoirs generally experienced complicated modification and destruction by structural impact in the multi-cycle basins, which is of crucial importance to hydrocarbon preservation and distribution. Together with the case study of the Ordovician carbonate hydrocarbon reservoirs in the Tarim Basin, fault modification in carbonate hydrocarbon accumulations is sub-divided into fault cutting, fault uplift, fault folding, fault reactivation and fault sealing type. Fault modification modes mainly include trap change, cap thinning, hydraulic action, pressure change and diagenetic change, etc., which results in the oil and gas leakage, washing, recharge and fluid property change. These lead to the complexity of oil and gas reservoir and distribution. Fault impacts on the hydrocarbon modification play significant roles in the carbonate hydrocarbon distribution and exploitation in the multi-cycle basins.