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塔里木盆地是我国的重要油气勘探区和产区,但是到目前为止,对塔河油田碳酸盐岩缝洞系统还认识不足,因而严重地影响了塔河油田的勘探开发。通过研究发现,塔河油田奥陶系碳酸盐岩油藏中的裂缝系统非常复杂,主要有两类裂缝:一种是构造裂缝;另一种是缝合线。前人认为前者重要,而忽略后者;而笔者等认为后者比前者更加重要。塔河油田奥陶系碳酸盐岩油藏中的缝合线非常发育,其频度是与石油成藏有一定关系的非构造裂缝所能及。根据缝合线与层面的关系,可以将塔河油田的奥陶系碳酸盐岩油藏中的缝合线分为三种:顺层缝合线、倾斜缝合线和竖直缝合线。这三种缝合线彼此交织成复杂的网络系统,构成了储层内部油气运移的最初级良好通道,同时与裂缝一起构成了有效的油气运移通道和压裂的弱结构面,为油气成藏和后期的开发创造了良好的条件。
The Tarim Basin is an important oil and gas exploration area and producing area in China. So far, however, there is still a lack of understanding of the carbonate fracture system in the Tahe oilfield, which has seriously affected the exploration and development of the Tahe oilfield. The study found that the fracture system in Ordovician carbonate reservoirs in Tahe Oilfield is very complicated. There are mainly two types of fractures: one is tectonic fracture and the other is suture. The former think that the former is important, while ignoring the latter; and I think the latter is more important than the former. The suture lines in Ordovician carbonate reservoirs in Tahe Oilfield are well developed and their frequency is within the range of non-structural fractures that have a certain relationship with petroleum accumulation. According to the relationship between suture and layer, the suture in Ordovician carbonate reservoir of Tahe Oilfield can be divided into three types: bedding suture, slanted suture and vertical suture. The three kinds of sutures are intertwined with each other into a complex network system, forming the first good channel for hydrocarbon migration inside reservoirs. Together with the fractures, they constitute effective hydrocarbon migration channels and fractured weak structural planes, Cang and late development has created good conditions.