焉耆盆地博湖坳陷三工河组下段地震相—沉积相分析
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摘要
为了探究焉耆盆地博湖坳陷岩性圈闭发育的有利区带,在地震层序划分的基础上,利用地震波振幅、频率、连续性、内部结构以及外部形态等特征,在研究区目的层划分出6种地震相类型。通过井-震结合,将地震相转化为与之相对应的沉积相。结果表明:三工河组下段主要发育冲积扇、辫状河三角洲平原、三角洲前缘、滨浅湖、浊积扇、半深湖等6种沉积相(亚相)类型;同时该区发育5个规模较大的沉积体,大体上对应着北西、北东及南部3个物源区。综合分析认为,三工河组下段整体上岩性圈闭发育条件较差,局部发育的河口砂坝、滨浅湖滩坝、浊积扇等可以形成岩性圈闭。
In order to study the favorable distribution area of lithologic traps in Bohu Depression of Yanqi Basin,based on seismic sequence division,the amplitude,frequency,continuity,internal structure and external form of seismic reflection wave were applied to analyze the seismic facies in the study area,and the seismic facies of the target zone can be divided into six types.The seismic facies is transformed into sedimentary facies by means of well-seismic combination.The result shows that six types of sedimentary facies are distinguished in the lower segment of Sangonghe Formation of Bohu Depression,including alluvial fan,braided river delta plain,delta front,shore-shallow lacustrine,turbidite fan and semi-deep lake facies.Meanwhile,there developed five types of larger sedimentary bodies,which corresponds to the three provinces in the northwest,northeast and south of the study area.It is considered that lithologic traps are less developed in the lower segment of Sangonghe Formation,only formed in the locally developed mouth bar,shore-shallow lacustrine beach bar and turbidite fan.
In order to study the favorable distribution area of lithologic traps in Bohu Depression of Yanqi Basin,based on seismic sequence division,the amplitude,frequency,continuity,internal structure and external form of seismic reflection wave were applied to analyze the seismic facies in the study area,and the seismic facies of the target zone can be divided into six types.The seismic facies is transformed into sedimentary facies by means of well-seismic combination.The result shows that six types of sedimentary facies are distinguished in the lower segment of Sangonghe Formation of Bohu Depression,including alluvial fan,braided river delta plain,delta front,shore-shallow lacustrine,turbidite fan and semi-deep lake facies.Meanwhile,there developed five types of larger sedimentary bodies,which corresponds to the three provinces in the northwest,northeast and south of the study area.It is considered that lithologic traps are less developed in the lower segment of Sangonghe Formation,only formed in the locally developed mouth bar,shore-shallow lacustrine beach bar and turbidite fan.
引文
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[2]姜在兴,吴明荣,陈祥,等.焉耆盆地侏罗系沉积体系[J].古地理学报,1999,1(3):19-27.
[3]柳广弟,张仲培,陈文学,等.焉耆盆地侏罗系油气系统特征与演化[J].石油学报,2002,23(6):20-23,28.
[4]吴明荣,姜在兴,操应长,等.焉耆盆地岩性油气藏勘探前景[J].新疆石油地质,2001,22(5):417-420.
[5]邱荣华,陈文礼,林社卿,等.焉耆盆地中生界层序地层与沉积体系分析[J].地球科学——中国地质大学学报,2001,26(6):615-620.
[6]肖力,王华,杨道庆,等.焉耆盆地博湖坳陷西山窑组沉积相研究[J].石油天然气学报,2008,30(2):182-186.
[7]宋传春.地震-地质综合研究方法述评[J].岩性油气藏,2010,22(2):133-139.
[8]吴嘉鹏,王英民,马贵明,等.孟加拉扇某区块地层层序划分及典型地震相识别[J].岩性油气藏,2010,22(2):69-73.
[9]曾令帮,段玉顺,毕明波,等.鄂尔多斯盆地西北部礁滩相储层地震识别与勘探效果[J].岩性油气藏,2011,23(2):75-79.
[10]徐怀大,王世飞,陈开远.地震地层学解释基础[M].武汉:中国地质大学出版社,1990:47-108.
[11]刘震.储层地震地层学[M].北京:地质出版社,1997:69-75.
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