歧口凹陷北大港潜山南北向走滑断裂的河道化作用分析
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摘要
通过北大港地区重力异常资料、三维地震资料分析,证实在北大港潜山上发育具有左旋走滑性质的红7-1断裂,其夹持于大张坨断裂与港西断裂之间,呈弧形沿南北方向展布。该断裂在古近系早中期均有活动,对多个层位砂体分布具有明显的控制作用,在该走滑断裂弧形带南侧,砂体厚度突变增大,呈"点源式"分布,从而形成明显的、且具有继承性的"沟-扇"对应关系。结合重矿物分析及北大港潜山上下切河道追踪发现,在走滑断裂顶部发育一系列下切河道;这些河道下切深度可达230～280ms,它们可以沟通板桥次凹与北大港潜山南翼,在过补偿阶段将板桥次凹的沉积物沿下切河道搬运到北大港潜山南侧的歧北次凹。可见,北大港潜山上近南北向的走滑断裂可以形成下切河道并起到搬运沉积物的作用(即断裂的河道化作用),进而在过补偿阶段控制板桥次凹与北大港潜山南翼的物源分配形式,所以,板桥次凹和歧北次凹在一定程度上均隶属于沧县隆起物源体系。
The provenance of the southern Beidagang buried hill in the central Qikou sag has been a matter of controversial,which directly inflict upon the oil and gas exploration program.Based on analyses of the gravity and 3D seismic data of the Beidagang area,we recognized a sinistral strike-slip fault(Hong 7-1) in the Beidagang buried hill,the Hong 7-1 occurs as a NW striking curved fault in-between the Dazhangtuo and Gangxi faults.This fault was active in the early and mid-Paleogene,and controlled obviously the Paleogenic sand distribution.The thickness of sandbody increases abruptly in the south end of the strike-slip fault exhibiting point-sourced distribution with distinct successive " channel-fan" characteristics.Heavy minerals analysis and incised channel tracking show that a series of incised channels with depth up to 230 ～ 280ms developed above the strike-slip fault in the Beidagang buried hill area.These channels joined the Banqiao sag and the south part of the Beidagang buried hill,and transported sediments to the latter.Therefore,the NW strike-slip fault in the Beidagang buried hill led to the formation of the incised channels and channel ways for sediment transportation,and thus,controlled the provenance in the Banqiao sag and south limp of the Beidagang buried hill during the period of over compensation.It can be inferred that the Banqiao and Qibei sags were somewhat controlled by the same provenance system,the Cangxian uplift.
The provenance of the southern Beidagang buried hill in the central Qikou sag has been a matter of controversial,which directly inflict upon the oil and gas exploration program.Based on analyses of the gravity and 3D seismic data of the Beidagang area,we recognized a sinistral strike-slip fault(Hong 7-1) in the Beidagang buried hill,the Hong 7-1 occurs as a NW striking curved fault in-between the Dazhangtuo and Gangxi faults.This fault was active in the early and mid-Paleogene,and controlled obviously the Paleogenic sand distribution.The thickness of sandbody increases abruptly in the south end of the strike-slip fault exhibiting point-sourced distribution with distinct successive " channel-fan" characteristics.Heavy minerals analysis and incised channel tracking show that a series of incised channels with depth up to 230 ～ 280ms developed above the strike-slip fault in the Beidagang buried hill area.These channels joined the Banqiao sag and the south part of the Beidagang buried hill,and transported sediments to the latter.Therefore,the NW strike-slip fault in the Beidagang buried hill led to the formation of the incised channels and channel ways for sediment transportation,and thus,controlled the provenance in the Banqiao sag and south limp of the Beidagang buried hill during the period of over compensation.It can be inferred that the Banqiao and Qibei sags were somewhat controlled by the same provenance system,the Cangxian uplift.
引文
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蒲秀刚,吴永平,周建生,杨池银,廖前进,周立宏,肖敦清,查明,柳飒.2007.歧口凹陷岩性地层油气藏特征及勘探潜力.石油学报,28(2):35-39.
王华,白云风,黄传炎,严德天,刘彦博,陈思,向雪梅,廖计华,夏存银,赵淑娥.2009.歧口凹陷古近纪东营期古物源体系重建与应用.地球科学——中国地质大学学报,34(3):448-456.
吴元燕,付建林,周建生,徐佑德.2000.歧口凹陷含油气系统及其评价.石油学报,21(6):18-22.
张国栋,康伟,翟瑞国,付国强,刘迎贵.2001.河流相储集层横向预测方法探索.石油勘探与开发,28(6):84-89.
张文才,赵颖,李会军,张新亮.2004.板桥-歧北地区沙一下沉积物源及沉积体系的再认识.河南石油,18(1):4-7.
Qu Fang,Chen Qinghua,Lian Chengbo,Zhang Juntao and CaiFulong.2008.Distribution and accumulation of oil and gasin southern Huanghua Depression.Petroleum Explorationand Development,35(3):294-300.
白云风,王振升,韦阿娟,吕学菊,张兵.2008.黄骅坳陷东营组重矿物时空展布特征及物源体系分析.大庆石油地质与开发,27(2):39-42.
白云风,张兵,王华,刘军,廖远涛,曹飞.2006.黄骅坳陷古近纪东营组物源方向研究.石油天然气学报,28(3):17-19.
陈纯芳,郑浚茂,王德发.2001.板桥凹陷沙三段沉积体系与物源分析.古地理学报,3(1):55-62.
樊敬亮,黄志全,樊卫花.2004.歧口凹陷新生代构造演化与油气.吉林大学学报(地球科学版),34(4):536-541.
郭兴伟,施小斌,丘学林,吴智平,杨小秋,肖尚斌.2007.渤海湾盆地新生代沉降特征及其动力学机制探讨.大地构造与成矿学,31(3):273-280.
何书,杨桥,王家鼎.2008.黄骅坳陷中区断裂系统分形研究.大地构造与成矿学,32(4):455-461.
焦养泉,李珍,周海民.1998.沉积盆地物质来源综合研究——以南堡老第三纪亚断陷盆地为例.岩相古地理,18(5):16-20.
李淑恩,张延章,温艳军,池永红,谭守强,张绍辉.2003.北大港构造浅层地震亮点与天然气勘探.天然气地球科学,4(4):291-294.
李珍,焦养泉,刘春华,郑红菊.1998.黄骅坳陷高柳地区重矿物物源分析.石油勘探与开发,25(6):5-7.
林畅松.2006.沉积盆地的构造地层分析——以中国构造活动盆地研究为例.现代地质,20(2):185-194.
刘金侠,金之钧.2004.板桥北大港成藏体系资源结构定量预测.大庆石油学院学报,28(1):44-46.
蒲秀刚,吴永平,周建生,杨池银,廖前进,周立宏,肖敦清,查明,柳飒.2007.歧口凹陷岩性地层油气藏特征及勘探潜力.石油学报,28(2):35-39.
王华,白云风,黄传炎,严德天,刘彦博,陈思,向雪梅,廖计华,夏存银,赵淑娥.2009.歧口凹陷古近纪东营期古物源体系重建与应用.地球科学——中国地质大学学报,34(3):448-456.
吴元燕,付建林,周建生,徐佑德.2000.歧口凹陷含油气系统及其评价.石油学报,21(6):18-22.
张国栋,康伟,翟瑞国,付国强,刘迎贵.2001.河流相储集层横向预测方法探索.石油勘探与开发,28(6):84-89.
张文才,赵颖,李会军,张新亮.2004.板桥-歧北地区沙一下沉积物源及沉积体系的再认识.河南石油,18(1):4-7.
Qu Fang,Chen Qinghua,Lian Chengbo,Zhang Juntao and CaiFulong.2008.Distribution and accumulation of oil and gasin southern Huanghua Depression.Petroleum Explorationand Development,35(3):294-300.
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