松辽盆地伏龙泉断陷断裂特征及控藏作用

Fracture characteristics and controls on reservoirs in Fulongquan Fault Depression, Songliao Basin

郭新军

GUO Xinjun

中国石化 东北油气分公司 生产运行管理处, 长春 130062

Production Operations Department, Northeast Oil & Gas Branch Company, SINOPEC, Changchun, Jilin 130062, China

对松辽盆地东南隆起区伏龙泉断陷近30条断裂平面与剖面发育特征进行了分析，并根据其形成时期与控制作用的不同将其划分为3期3级：一级为控洼断裂，二级为同沉积断裂，三级则为晚期调节断裂，其中，伏龙泉断陷西部缓坡带主要发育二、三级断裂。通过西部缓坡带F6同沉积断裂两侧钻井揭示到的油气赋存层系，分析了该断裂对油气的输导与封堵作用。断裂上盘主动盘发育大量诱导缝，断面成为油气运移的主要通道；下盘被动盘中形成泥岩涂抹，对油气藏侧向封堵，证实了断裂主动盘侧利于油气输导、被动盘侧利于油气封堵的观点。根据同沉积断裂与调节断裂组合方式的差异，总结出断裂对伏龙泉西部缓坡带原生与次生油气藏的控制作用。

The horizontal and vertical characteristics of nearly 30 faults in the Fulongquan Fault Depression in the southeastern uplift of the Songliao Basin were analyzed. According to the epochs and controls of these faults, we classified them into three stages and three levels. The level 1 includes depression controlling faults, the level 2 includes synsedimentary faults, and the level 3 includes accommodation faults. On the western slope of the Fulongquan Fault Depression, there mainly develop level 2 and level 3 faults. Meanwhile, based on the hydrocarbon shows revealed by wells on both sides of the fault F6 on the western gentle slope, we analyzed the conducting and sealing effects of faults on hydrocarbon. A large number of induced fractures were developed on the active side of faults. Mudstones on the passive side laterally block oil and gas. It confirms that the active side of faults is favorable for hydrocarbon migration, while the passive side is favorable for hydrocarbon sealing. Based on the difference between the combination of sedimentary and accommodation faults, we identified the controls of fractures on hydrocarbon accumulation in primary and secondary reservoirs on the western slope of Fulongquan Fault Depression.

中国石化科技部项目（ZDP17014）资助。

https://doi.org/10.11781/sysydz201905657