桂中坳陷中泥盆统罗富组层序地层与沉积体系
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摘要
综合运用露头、岩心、地震等资料,应用层序地层学和沉积学的理论方法,研究了桂中坳陷中泥盆统罗富组的层序地层特征及沉积演化规律,识别出2个三级层序,分别为SQ1和SQ2。区内的层序界面,在地震剖面上主要表现为上超和削蚀,在垂向上主要出现在地层叠加方式的转换带。通过对基干剖面、辅助剖面和主要钻井资料的分析,绘制了桂中坳陷中泥盆纪东岗岭期(SQ1,SQ2)的沉积体系图。
In order to study the sequence features and depositional evolution of Luofu middle Devonion Formation in Guizhong depression by the theories of outcrops,drill core,sequence stratigraphy and sedimentology,midlle Devonian outcrops and well drilling data are analyzed carefully.Two third-order sequences are identified and named as SQ1 and SQ2.The methods of identificating sequence boundary are analyzed.Sequence boundary in seismic profile is found to be onlap and truncation in the transiton zone of stacking pattern.By analysis of cadre cut plane,assisting cut plane and chief well drilling datas,sedimentary facies in study area are well known.Dipositional system maps in middle Devonian Donggangling stage(SQ1 and SQ2)are established.
In order to study the sequence features and depositional evolution of Luofu middle Devonion Formation in Guizhong depression by the theories of outcrops,drill core,sequence stratigraphy and sedimentology,midlle Devonian outcrops and well drilling data are analyzed carefully.Two third-order sequences are identified and named as SQ1 and SQ2.The methods of identificating sequence boundary are analyzed.Sequence boundary in seismic profile is found to be onlap and truncation in the transiton zone of stacking pattern.By analysis of cadre cut plane,assisting cut plane and chief well drilling datas,sedimentary facies in study area are well known.Dipositional system maps in middle Devonian Donggangling stage(SQ1 and SQ2)are established.
引文
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[2]梅冥相,曾萍,初汉明,等.滇黔桂盆地及邻区泥盆纪层序地层格架及其古地理背景[J].吉林大学学报:地球科学版,2004,34(4):546-554.
[3]杜远生,龚一鸣,刘本培,等.华南板块泥盆纪层序地层及海平面变化[J].岩相古地理,1996,16(6):14-23.
[4]吴如灼,吴永忠.黔南地区中泥盆统高分辨层序地层研究[J].长春地质学院学报,1996,26(3):255-260.
[5]龚一鸣,吴诒,杜远生.黔桂泥盆纪层序地层及海平面变化的频幅、速度和相位[J].地球科学——中国地质大学学报,1994,19(5):575-586.
[6]刘宝?,许效松.中国南方岩相古地理图集[M].北京:科学出版社,1994:56-67.
[7]曾允孚.中国南方泥盆纪岩相古地理与成矿作用[M].北京:地质出版社,1993:41-90.
[8]李正文,赵志超.地震勘探资料解释[M].北京:地质出版社,l988:1-3.
[9]张世奇,纪友亮,王金友,等.陆相断陷湖盆中可容空间变化特征探讨[J].矿物岩石,2001,21(2):34-37.
[10]Muto T,Steel R J.The accommodation concept in sequencestratigraphy:some dimensional problems and possible redefi-nition[J].Sedimentary Geology,2000,130(1-2):1-10.
[11]郭文平,胡受权.南襄盆地泌阳断陷陆相高分辨率层序地层学研究[J].桂林工学院学报,2001,21(4):318-323.
[12]佩顿C E.地震地层学[M].牛毓荃,译.北京:石油工业出版社,1980:56-69.
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