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松辽盆地南部长岭凹陷是陆相富油气凹陷,根据“满凹含油”的地质认识,在有效烃源岩范围内,都可以发现油气。但油气富集区(通常称为“甜点”)仍有主控因素和分布规律。在凹陷中的低凸起、基底断层上方形成的断裂发育带,一方面可以作为重要的油气运移通道,另一方面还可以成为油气圈闭的侧向封挡,是油气富集区的主边界。同时断裂周围发育的构造裂缝大大改善了储集层的连通性,使油气藏高产的概率大大增加,使断裂发育带本身成为油气富集的“甜点”带。因此,断裂发育带对油气富集区的形成和分布具有明显的控制作用,应更加重视对断裂带本身的油气勘探。图5参10
The Changling Sag in the southern part of the Songliao Basin is a continental oil and gas depressions. According to the geological understanding of “Manchu oil”, oil and gas can be found within the range of available source rocks. However, there are still major controlling factors and distribution rules for oil and gas-rich areas (often referred to as “desserts”). On the one hand, it can be regarded as an important channel for oil and gas migration, on the other hand, it can also become a lateral seal of oil and gas trap and is the main reservoir of oil and gas-rich areas boundary. At the same time, tectonic fractures developed around faults greatly improve the connectivity of reservoirs, greatly increasing the probability of high oil and gas reservoirs, making the fault zone itself a “sweet spot” for hydrocarbon enrichment. Therefore, the zone of fault development has a significant control over the formation and distribution of oil and gas-rich areas, and more attention should be paid to the exploration of oil and gas in the fault zone itself. Figure 5 Reference 10