层序的测井、地震响应特征研究
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摘要
在层序地层学研究中,关键是层序划分和对比。而层序划分、对比的关键是层序识别。层序的识别包括层序界面(层序的底界面、初始海泛面和最大海泛面)的识别和构成层序的体系域识别。这里,在众多前人研究成果的基础上,详细研究了层序的测井、地震响应特征,即层序界面和体系域在测井曲线上和地震剖面上的特征。其中,层序底界面在测井上表现为突变的钟型、箱型或侧积式曲线的底界;在地震剖面上表现为剥蚀、顶超、上超、下超;而体系域在测井曲线上的响应为:低水位体系域的海底扇以漏斗形中、高幅的前积式,或钟型中、低幅的后积式模式为特征,陆坡扇成钟型、正向齿形,自下而上幅度由中高幅→低幅,即具后积式测井模式,低水位楔的测井曲线表现为旋回性进积模式特征,其特征表现为锯齿状箱型。海侵体系域的测井曲线呈现向上变细、变深序列,并表现为钟型、正向齿形或齿化状,幅度由高幅变化为低幅,包络线具后积式特征。高水位体系域相应的测井曲线呈现中幅箱形或桶形,不同体系域在地震剖面上的响应特征明显不同。
It is well known that the key of research sequence stratigraphy is sequence division and correlation.The key of sequence division and correlation is sequence identification which including the identification sequence boundary surface and system tract and a lot of researches have been made in the area.On the basis of researched results,we study the well logging and seismic responding characters of sequence boundary and system tract.The curve of well logging of sequence bottom boundary appears as the base of suddenly changed bell like、box like or side accumulating curve;On the seismic section it appears as erosion、toplap、onlap、downlap;the curve of well logging of system tract responds as: The LST's sea floor fan is characterized by foreset-like with funnal mode of medium to high amplitude or by bakeset-like with bell-like mode of medium to low amplitude.The curves of well logging of land slope fan shows as bell-like and tooth-like with medium to low amplitude whic is the backset mode.The LSW's curves of well logging are characterized by recycleing programding mode and toothed box-like.The TST's curves of well logging show as deeper、finer-upword sequence and bell-like,tooth-like or toothed shape,of which amplitude changed from high to low and envelope line is backset.The curves of HST's well logging show as medium amplitude box-like or barrel-like.Diversity system tract show different seismic respond character.
It is well known that the key of research sequence stratigraphy is sequence division and correlation.The key of sequence division and correlation is sequence identification which including the identification sequence boundary surface and system tract and a lot of researches have been made in the area.On the basis of researched results,we study the well logging and seismic responding characters of sequence boundary and system tract.The curve of well logging of sequence bottom boundary appears as the base of suddenly changed bell like、box like or side accumulating curve;On the seismic section it appears as erosion、toplap、onlap、downlap;the curve of well logging of system tract responds as: The LST's sea floor fan is characterized by foreset-like with funnal mode of medium to high amplitude or by bakeset-like with bell-like mode of medium to low amplitude.The curves of well logging of land slope fan shows as bell-like and tooth-like with medium to low amplitude whic is the backset mode.The LSW's curves of well logging are characterized by recycleing programding mode and toothed box-like.The TST's curves of well logging show as deeper、finer-upword sequence and bell-like,tooth-like or toothed shape,of which amplitude changed from high to low and envelope line is backset.The curves of HST's well logging show as medium amplitude box-like or barrel-like.Diversity system tract show different seismic respond character.
引文
[1]徐怀大.层序地层学原理[M].北京:石油工业出版社,1993
[2]VAIL P R,HARDENBOL J.Sea-level changes duringthe tertiary[J].Oceans,1978,22:77.
[3]陈方鸿,王贵文.塔里木盆地塔中地区志留系测井层序地层学研究[J].沉积学报,1999,17(1):58.
[4]孙志华,吴奇之,张一伟,等.层序界面在地球物理资料上的响应特征[J].石油地球物理勘探,2001,36(5):626.
[5]钱亦中,陈洪德.层序地层学理论和研究方法[M].成都:四川科学技术出版社,1994.
[6]VAIL P R,Sequence stratigraphy workbook,fundam en-tals of sequence stratigraphy[A].VAIL P R,SAN-GREE J B.AAPG Annual Convention Short Course:Sequence Stratigraphy Interpretation of Se ism icW ell andOutcrop Data[C].1989.P presented,M arch 19,Houston,Texas.
[2]VAIL P R,HARDENBOL J.Sea-level changes duringthe tertiary[J].Oceans,1978,22:77.
[3]陈方鸿,王贵文.塔里木盆地塔中地区志留系测井层序地层学研究[J].沉积学报,1999,17(1):58.
[4]孙志华,吴奇之,张一伟,等.层序界面在地球物理资料上的响应特征[J].石油地球物理勘探,2001,36(5):626.
[5]钱亦中,陈洪德.层序地层学理论和研究方法[M].成都:四川科学技术出版社,1994.
[6]VAIL P R,Sequence stratigraphy workbook,fundam en-tals of sequence stratigraphy[A].VAIL P R,SAN-GREE J B.AAPG Annual Convention Short Course:Sequence Stratigraphy Interpretation of Se ism icW ell andOutcrop Data[C].1989.P presented,M arch 19,Houston,Texas.
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