歧口凹陷新生代宏观构造解释及勘探前景分析
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摘要
歧口凹陷三维地震资料分年度采集区块小,为此进行了连片三维地震宏观构造解释研究。提出"点-线-面一体"的解释方法,即井震结合层位标定、区域结构剖面建立、构造层序划分、井层控制变速成图等方法。将歧口凹陷连片三维地震区新生代划分为7个构造层序进行对比解释,获得了井震结合全区统层、宏观构造格局、断裂平面和剖面组合特征、火山岩发育与分布情况等成果。分析认为,该区宏观构造格局为"三横三竖":受北西-南东向拉张应力场控制形成的北北东-北东东向构造带和同沉积断层组成"三横",由南西-北东侧向挤压应力控制和同沉积断层分段活动差异形成的褶皱组成"三竖"。受中生界残留盆地的控制,在近南北向大区域拉张应力场作用下经历了古近纪扩张深陷、稳定发展和衰减3个阶段。新生代断裂类型主要有正断层和张扭断层,均为伸展断层,其分布具有明显的方向性。火山岩发育与湖盆拉张期构造活动关系密切,主要分布在主断层交汇或弯折处。根据新成果提出北大港潜山带东翼围斜构造和南翼同沉积构造为近期勘探重点目标,张东-歧东断裂构造带为近期重点勘探区带,预期具有较大的勘探前景。
The 3-D seismic data in Qikou depression was collected in dif- ferent years with small acquisition area.This is not beneficial to the study of the macrostrncture pattern and macro-depositional se- quence.Therefore,a merged 3-D macrostructure interpretation was carried out in this area.The‘point-line-plane-body’interpreta- tion method was proposed,including well seismic connected cali- bration,regional structural profile establishment,structural se- quence division and well-layer controlling variable-speed mapping. Using this method,the 3-D area of Neozoic in Qikou depression was divided into seven structural sequences,obtaining the uniform- ity of formations,the macrostructure framework,the configuration characteristics of faults on plane and section,the development and distribution of volcanic rock.The analysis indicates that the macro- structure is‘three-in-latitudinal and three-in-longtitudinal’.The NNE-NEE structural belt and contemporaneous fault controlled by the NW-SE tension stress field form the‘three-in-latitudinal’.The fold controlled by the SW-NE lateral compression stress and the ac- tivity difference of contemporaneous fault in different section form the‘three-in-longtitudinal’.Controlled by the residual basin of Mesozoic and affected by the nearly N-S regional tension stress field,the macrostructure of Palaengene system has experienced three stages:expansion and depression,stable development and depletion.The fracture types of Cenozoic mainly include normal fault and transtensional fault,both of them are extensional faults and have apparent directivity.The development of volcanic rock is intimately related with the structural activity of the basin extension period.The volcanic rock mainly distributes in the joint or bending point of major faults.According to the new achievements,the per- icline belt of eastern Beidagang buried hill and the syndeposit struc- ture of southern part were thought to be the main exploration tar- get.Meanwhile,Zhangdong-Qidong faulted structural belt was the major exploration belt in the near future.
The 3-D seismic data in Qikou depression was collected in dif- ferent years with small acquisition area.This is not beneficial to the study of the macrostrncture pattern and macro-depositional se- quence.Therefore,a merged 3-D macrostructure interpretation was carried out in this area.The‘point-line-plane-body’interpreta- tion method was proposed,including well seismic connected cali- bration,regional structural profile establishment,structural se- quence division and well-layer controlling variable-speed mapping. Using this method,the 3-D area of Neozoic in Qikou depression was divided into seven structural sequences,obtaining the uniform- ity of formations,the macrostructure framework,the configuration characteristics of faults on plane and section,the development and distribution of volcanic rock.The analysis indicates that the macro- structure is‘three-in-latitudinal and three-in-longtitudinal’.The NNE-NEE structural belt and contemporaneous fault controlled by the NW-SE tension stress field form the‘three-in-latitudinal’.The fold controlled by the SW-NE lateral compression stress and the ac- tivity difference of contemporaneous fault in different section form the‘three-in-longtitudinal’.Controlled by the residual basin of Mesozoic and affected by the nearly N-S regional tension stress field,the macrostructure of Palaengene system has experienced three stages:expansion and depression,stable development and depletion.The fracture types of Cenozoic mainly include normal fault and transtensional fault,both of them are extensional faults and have apparent directivity.The development of volcanic rock is intimately related with the structural activity of the basin extension period.The volcanic rock mainly distributes in the joint or bending point of major faults.According to the new achievements,the per- icline belt of eastern Beidagang buried hill and the syndeposit struc- ture of southern part were thought to be the main exploration tar- get.Meanwhile,Zhangdong-Qidong faulted structural belt was the major exploration belt in the near future.
引文
1靳玲，苏桂芝，刘桂兰．合成地震记录制作的影响因素及对策[J]．石油物探，2004，43(3)：267～271
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3钱绍瑚，刘江平．大面积变速绘制构造图中速度参数的求取方法[J]．石油物探，1995，34(1)：110～115，122
4李绍光，吴涛主编．大港油田石油地质志[M]．北京：石油工业出版社，1991．81～83
5李丕龙．陆相断陷盆地构造演化与构造样式[M]．北京：石油工业出版社，2003．87～105
6周立宏，李三忠，刘建忠等．渤海湾盆地前第三系构造演化与潜山油气成藏模式[M]．北京：中国科学技术出版社，2003．125～130
7裴正林，牟永光．火成岩区地震波传播规律研究[J]．石油物探，2004，43(5)：433～437
8宋玉龙．滩浅海地区地震勘探存在问题及其解决方法[J]．石油物探，2005，44(4)：343～347
9凌云，孙德胜，高军等．叠置薄储层的沉积微相解释研究[J]．石油物探，2006，45(4)：329～341
2张永华．三维地震资料综合解释方法探讨[J]．石油物探，2004，43(1)：49～53
3钱绍瑚，刘江平．大面积变速绘制构造图中速度参数的求取方法[J]．石油物探，1995，34(1)：110～115，122
4李绍光，吴涛主编．大港油田石油地质志[M]．北京：石油工业出版社，1991．81～83
5李丕龙．陆相断陷盆地构造演化与构造样式[M]．北京：石油工业出版社，2003．87～105
6周立宏，李三忠，刘建忠等．渤海湾盆地前第三系构造演化与潜山油气成藏模式[M]．北京：中国科学技术出版社，2003．125～130
7裴正林，牟永光．火成岩区地震波传播规律研究[J]．石油物探，2004，43(5)：433～437
8宋玉龙．滩浅海地区地震勘探存在问题及其解决方法[J]．石油物探，2005，44(4)：343～347
9凌云，孙德胜，高军等．叠置薄储层的沉积微相解释研究[J]．石油物探，2006，45(4)：329～341
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