歧口凹陷“包心菜”构造的形成机制与演化
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摘要
目的研究"包心菜"构造的结构特征和演化过程,探讨其形成和演化的动力学机制。方法运用歧口凹陷地震资料,采取平衡剖面及地震地层界面拉平方法进行综合分析。结果 "包心菜"构造为具有"凹中隆"结构的新型构造类型,一般出现于凹陷断层交汇或拐弯处;歧口凹陷内典型的"包心菜"构造为滨海1号,另外,港东断层东北端和歧东断层下降盘的"包心菜"构造也较为典型;凹陷内的"包心菜"构造在东营末期出现隆升,东营组遭受剥蚀,随后区域沉降接受沉积,在新近纪出现隆起塌陷形成"包心菜"构造。结论 "包心菜"构造的形成和演化受控于区域构造应力场和深部热作用,其形成经历了4个演化阶段:在区域挤压背景下形成隆升→隆升处地层遭受剥蚀夷平→区域沉降接受沉积→应力撤出,隆起塌陷,形成"包心菜"构造样式。
Aim To research the construction and evolution of "Cabbage" structure and analyze the dynamic mechanism of the formation and evolution.Methods Using the seismic data of Qikou sag and adopting the methods of balanced section and layer flattening in seismic.Results "Cabbage" structure is a new structure type with "uplift in sag" construction,which is generally developed in the intersections or corners of faults in sag;Binhai No.1 structure is the typical representative of "cabbage" structure in sag,and "Cabbage" structures in the northeastern end of Gangdong Fault and the downthrow side of Qidong Fault are also researched;"Cabbage" structures in Qikou sag was uplifted in the end of Dongying period followed by denudation in the Dongying formation and deposited as regional subsidence,and the uplift collapsed to form "cabbage" structure in Neogene.Conclusion The formation and evolution of "cabbage" structure are controlled by regional tectonic stress field and the deep thermal process,and the formation can be divided into four evolution stages: uplifting under regional compression→denudation planation of the strata in uplift→deposition in regional subsidence→stress withdrawal→uplift collapse to form a "cabbage" structure.
Aim To research the construction and evolution of "Cabbage" structure and analyze the dynamic mechanism of the formation and evolution.Methods Using the seismic data of Qikou sag and adopting the methods of balanced section and layer flattening in seismic.Results "Cabbage" structure is a new structure type with "uplift in sag" construction,which is generally developed in the intersections or corners of faults in sag;Binhai No.1 structure is the typical representative of "cabbage" structure in sag,and "Cabbage" structures in the northeastern end of Gangdong Fault and the downthrow side of Qidong Fault are also researched;"Cabbage" structures in Qikou sag was uplifted in the end of Dongying period followed by denudation in the Dongying formation and deposited as regional subsidence,and the uplift collapsed to form "cabbage" structure in Neogene.Conclusion The formation and evolution of "cabbage" structure are controlled by regional tectonic stress field and the deep thermal process,and the formation can be divided into four evolution stages: uplifting under regional compression→denudation planation of the strata in uplift→deposition in regional subsidence→stress withdrawal→uplift collapse to form a "cabbage" structure.
引文
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[2]米立军.新构造运动与渤海海域上第三系大型油气田[J].中国海上油气(地质),2001,15(1):21-28.
[3]陈清华,张福利,王秀玲,等白东构造带成因分析[J].大地构造与成矿学,2007,33(4):400-403.
[4]王应斌,黄雷,王强,等.渤海浅层油气富集规律———以黄河口凹陷为例[J].石油与天然气地质,2011,32(54):637-650.
[5]樊敬亮,黄志全,樊卫花.歧口凹陷新生代构造演化与油气[J].吉林大学学报:地球科学版,2004,34(4):537-540.
[6]余一欣,周心怀,徐长贵,等.渤海海域新生代断裂发育特征及形成机制[J].石油与天然气地质,2011,32(2):273-279.
[7]漆家福,邓荣敬,周心怀,等.渤海海域新生代盆地中的郯庐断裂带构造[J].中国科学D辑:地球科学,2008,38(增刊1):19-29.
[8]张杰,邱楠生,王昕,等.黄骅拗陷歧口凹陷热史和油气成藏史[J].石油与天然气地质,2005,26(4):505-511.
[9]张绍辉,王振升,刘玉梅,等.歧口凹陷火成岩岩相与储集空间特征研究[J].天然气地球科学,2010,21(4):572-575.
[10]周立宏,吴永平,肖敦清,等.黄骅拗陷第三系火成岩与油气关系探讨[J].石油学报,2000,21(6):29-34.
[11]刘池洋.热力作用的地质、成矿(藏)效应及其判识[J].石油与天然气地质,2010,31(6):725-733.
[12]陈昭年,陈发景,周建生,等.黄骅拗陷中北区和歧口凹陷断裂构造特征及古应力分析[J].现代地质,1997,11(4):471-477.
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