海拉尔苏仁诺尔断裂侧向封闭的空间分布及其对油气聚集的控制作用

Spatial distribution of lateral sealing from Shurennouer fault and its control on hydrocarbon accumulation in Hailaer basin

通过断裂侧向封闭机理及影响因素分析，利用断裂带中泥质含量的估算值对苏仁诺尔断裂侧向封闭的空间分布进行了研究。结果表明，苏仁诺尔断裂在浅部地层存在侧向封闭，而在深部地层侧向不封闭或封闭性差。苏仁诺尔断裂在大一段、大二段具有侧向封闭性；在南二段除T340测线以南局部范围不具备侧向封闭性或封闭性差外，大部分地区均具有侧向封闭性；在南一段仅除T360～l420测线之间和X848测线以东局部地区具有侧向封闭性外，大部分地区不具备侧向封闭性或封闭性差。根据对断层侧向封闭空间分布与油气藏分布关系的研究，可以得出苏仁诺尔断裂对油气聚集具有两方面的控制作用：①断裂侧向封闭纵向分布的差异性造成了油气聚集层位的差异性；②断裂侧向封闭平面分布的差异性决定了油气聚集沿断裂分布的差异性。

Based on an analysis of lateral fault sealing and its relevant factors, the spatial distribution of lateral sealing from Shurennouer fault is deeply researched by estimating mudstone content in the fault zone. It has been suggested that Shurennouer fault can provide lateral sealing in shallow intervals and has no or poor lateral sealing in deep intervals. For K1d1 and K1d2 members, Shurennouer fault is laterally sealed, and for K1n2 member, however, it is not lateral sealed south of Line Ⅰ 340, even though having lateral sealing in other areas. For K1n, member, the fault has lateral sealing only be tween Line Ⅰ360 and lane Ⅰ 420 and east of lane X848, with no or poor sealing in other areas. From a study on the relationship between spatial distribution of lateral fault sealing and hydrocarbon accumulation, two controls of Shurennouer fault can be concluded. （1） The variation in vertical distribution of lateral sealing has resulted in variation in hydrocarbon accumulation intervals; （2） The variation in areal distribution of lateral sealing has led to variation in hydrocarbon accumulation along the fault.