松辽盆地敖古拉断裂带反转构造圈闭形成机制及控藏作用  

Forming mechanism of the inverted structural trap in Aogula fault zone of Songliao Basin and its reservoir controlling action

作　　者：孙显义[1] 许凤鸣[1] 王瑞[2] SUN Xianyi;XU Fengming;WANG Rui(Exploration Department of Daqing Oilfield Co Ltd, Daqing 163453, China;Exploration and Development Research Institute of Daqing Oilfield Co Ltd, Daqing 163712, China)

机构地区：[1]大庆油田有限责任公司勘探事业部,黑龙江大庆163453 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《大庆石油地质与开发》2020年第5期10-16,共7页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油天然气股份有限公司重大科技专项“大庆油气持续有效发展关键技术研究与应用”(2016E-0210)。

摘　　要：松辽盆地中央坳陷区敖古拉断裂带对敖古拉油田的形成及油气分布的控制作用历来存在争议,集中在断裂带对油气运聚是纵向疏导还是横向分割。从断裂带构造解剖入手,分析构造发育演化历程,尤其是后期的构造反转活动,进而研究圈闭形成机制及油气成藏控制作用。研究认为,断裂带的后期构造反转,形成了众多反转背斜和反向屋脊断块等伴生构造,为油气提供了聚集场所;反转断层活动,对油气运移产生的地震泵与断层阀作用,纵向沟通青一段烃源岩与上覆萨、葡、高多个储集层系,使油气在上部几个储集层系中调节分配,起到油源断层的作用;在断块上倾方向形成的断层遮挡条件,受到长期构造活动影响而降低;敖古拉地区油气主要集中于断层上盘发育的系列反转背斜圈闭中,而下盘油气聚集丰度低、反向屋脊断块油藏不发育,与油源断层沟通的岩性圈闭是下盘油气成藏的主要场所;敖古拉断裂带对油气分布的主要贡献在于其沟通下生上储组合,是油气聚集的重要油源断层,与之伴生的上盘多个反转背斜和下盘与油源断层相关的岩性体是油气聚集的主要场所。对松辽盆地龙西地区具类似特征的其他几条大断裂中浅层油气,勘探上应予以关注。The controlling action of Aogula fault zone in the Central Depression of Songliao Basin on the formation and hydrocarbon distribution of Aogula Oilfield has been argued for a long time,and the problem is focused on the vertical conduit or lateral barrier to the petroleum migration for the fault zone.To start with the structural dissection of the fault zone,the structural evolution and especially the late structural reversion were analyzed,then the forming mechanism of the trap and its controlling action over the petroleum accumulation were figured out.The study shows that the late structural reversion of the fault zone has resulted in many associated structures such as inverted anticlines and reversal roof fault blocks,which provide the accumulation space for the hydrocarbon;the inverted fault activities play a role of seismic pumping and fault valve on the hydrocarbon migration by communicating the source rock of Member Qing-1 with the overlying Sa,Pu and Gao reservoirs vertically to adjust the distribution of oil and gas in the upper reservoir system and play the role of oil source fault.The fault barrier condition formed in the updip direction of the fault block is reduced by the influence of the long-term structural activities.The oil and gas in Aogula region are mainly concentrated in the series of the inverted anticline trap developed on the upper wall of the fault;while the accumulated abundance of the oil and gas on the lower wall is rather poorer and the reversal roof fault block reservoir is not well-developed,the lithological trap connected with the oil source fault is the main space for the lower-wall hydrocarbon accumulation.The main contribution of Aogula fault zone is shown in connecting the the lower source rock-upper reservoir assemblage and has become the important oil source fault of the hydrocarbon accumulation,many inverted anticline of the upper wall associated with the fault belt and the lithologic bodies of the low wall related with oil source fault are the main hydrocarbon accumulation sp

关 键 词：反转断层 反转背斜 地震泵 断层阀 油源断层 

分 类 号：TE122.2[石油与天然气工程—油气勘探]