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歧口凹陷后裂陷期构造特征与浅层油气成藏

Keywords: 歧口凹陷,后裂陷期,构造样式,断层活动速率,浅层油气藏

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Abstract:

?歧口凹陷馆陶组底界是一个区域上可对比的不整合界面,将盆地演化划分为古近纪裂陷期和新近纪—第四纪后裂陷期,后裂陷期构造样式主要为断层以及断层相关褶皱、火成岩构造。本文基于高精度三维地震资料精细解释,揭示了歧口凹陷后裂陷期的构造特征,通过计算断层活动速率了解了歧口凹陷的构造活动规律,得出以下认识:①断层构造包括继承性活动的主干断层及在后裂陷期构造应力场下发育的大量近东西向新生断层,在平面上两类断层成小角度相交,整体构成帚状构造,表现出明显的右旋张扭特征;②褶皱构造包括逆牵引褶皱、正形负花状构造、披覆背斜,在平面上披覆背斜、逆牵引褶皱和正形负花状构造基本上依次向东排列,但在局部地区也有相互共存的现象;③火成岩构造表现为一个火山通道发育多个帽型构造,火山顶部表现为强反射层,后裂陷期地层超覆其上,在火成岩构造旁侧断层发育;④断层活动速率计算结果表明,后裂陷期主干断层活动趋势主要分为断层活动速率由逐渐增大到逐渐变小、逐渐增大、混合型三种,其中前两种类型断层对油气的运聚最为有利,控制的油田分布最多。综合分析后认为,歧口凹陷内最有利的浅层油气藏类型是断层相关褶皱型油气藏和潜山披覆背斜型油气藏,火成岩活动对油气的生成和运聚也具有重要意义。

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[8]  周心怀,牛成民,滕长宇.环渤中地区新构造运动期断裂活动与油气成藏关系.石油与天然气地质,2009,30(4):469-475zhouxin-huai,niucheng-mingandtengchang-yu.relationshipbetweenfaultingandhydrocarbonpoolingduringthencotectonicmovementaroundthecentralbo-haibay.oil&.gasgeology,2009,30(4):469-475
[9]  丁巍伟,戴金星,杨池银,陶士振,侯路.黄骅坳陷港西断裂带包裹体中氦同位素组成特征[j].科学通报.2005,50(16):1768-1773
[10]  黄传炎,王华,吴永平,陈思,王家豪,任陪正,夏存银.歧日凹陷第三系层序格架下的油气藏富集规律.吉林大学学报(地球科学版),2010,40(5):986-995huangchuan-yan,wanghua,wuyong-ping,chensi,wangjia-hao,renpei-gangandxiacun-yin.a-nalysisofthehydrocarbonenrichmentregularityinthesequencestratigraphicframeworkoftertiaryinqikousag.journalofjilinuniverszty(earthsci-enceedition),2010,40(5):986-995
[11]  陈蓉,李勇,丘东洲等.黄骅坳陷新近系馆陶组iii段辫状河相高分辨率层序分析[j].沉积与特提斯地质.2006,26(3):56-60
[12]  张杰等.黄骅坳陷歧日凹陷热史和油气成藏史[j].石油与天然气地质.2005,26(4):505-511
[13]  高长海,查明.大港油田堤北断阶带油气成藏过程分析.石油天然气学报(江汉石油学院学报),2008,30(4):47-53gaochang-hai,chaming.hydrocarbonaccumula-tionprocessinchengbcifaultstepbeltofdagangoil-field.journalofoilandgastechnology(jjpi),2008,30(4):47-53
[14]  吴孔友等.黄骅坳陷堤北断坡不整合特征与油气成藏.占一地理学报,2008,10(5):545--554wukong-youetal.characteristicsofunconformityandhydrocarbonaccumulationinchengbcifaultslopeofhuanghuadepression.journalofpalaeogeogra-phy,2008,10(5):545-554
[15]  王华崇,冉启全,胡永乐.大港枣园油田火成岩岩相.石油勘探与开发,2004,31(5);21-24wanghua-chong,ranqi-quanandhuyong-le.lgneouslithofaciesinzao35block,dagangoilfield.petroleumexploraticmanddevelopment,2004,31(5);21-24
[16]  冉启全,胡永乐,任宝生.火成岩岩性识别方法及其应用研究—以大港枣园油田枣35块火成岩油藏为例.中国海上油气,2005,17(1);25-30

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