井—震结合进行高分辨率层序地层划分——以南苏门答腊盆地N油田U组为例
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摘要
N油田U组上段地层发育粉砂岩和钙质泥页岩的三角洲前缘—浅海过渡相,多变的沉积相加大了小层对比的难度。针对此特点,结合层序地层学理论以及地震地层学的理论与研究方法,进行井—震结合对比划分地层,利用地震资料和标准层控制,构建大套地层等时格架;然后运用地震反射轴的等时性结合沉积旋回在地层格架内对比小层,确定研究区80口井6个分界界面。建立了区域高分辨率层序地层格架,形成了可容纳空间控制下的高级次层序格架建立的技术方法。
The upper U formation in N oil field develops delta front-shallow transition phase with siltstone and calcareous shale.The changeable sedimentary facies increased the difficulty of layer correlation.According to these features,combined with sequence stratigraphy and seismic stratigraphy,integration of well and seismic was used to divide layers,under the control of seismic data and key bed,the formation isochronous framework was built.Then with the seismic reflection isochronism and the sedimentation cycle layers were divided in formation,6 boundary interfaces of 80 wells was determined in research area.In the end,regional high-resolution sequence stratigraphic framework was established,and senior stratigraphic framework technology in the accommodation space was formed.
The upper U formation in N oil field develops delta front-shallow transition phase with siltstone and calcareous shale.The changeable sedimentary facies increased the difficulty of layer correlation.According to these features,combined with sequence stratigraphy and seismic stratigraphy,integration of well and seismic was used to divide layers,under the control of seismic data and key bed,the formation isochronous framework was built.Then with the seismic reflection isochronism and the sedimentation cycle layers were divided in formation,6 boundary interfaces of 80 wells was determined in research area.In the end,regional high-resolution sequence stratigraphic framework was established,and senior stratigraphic framework technology in the accommodation space was formed.
引文
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[2]Curray J R,Emmel F G,Moore D G.The Bengal Fan:Morphology,geometry,stratigraphy,history and processes[J].Marine and Petro-leum Geology,2003(19):1191-1223.
[3]Shannon P M,Stoker M S,Praeg D,et a1.Sequence stratigraphic a-nalysis in deep-water,underfilled NW European passive margin ba-sins[J].Marine and Petroleum Geology,2005(22):1185-1200.
[4]毛治国,樊太亮,刘亚明,等.南苏门答腊盆地北部新生代层序地层格架及有利储层分布[J].中南大学学报(自然科学版),2007,38(6):1225-1230.
[5]毛治国,樊太亮,王宏语,等.层序地层格架下岩性-地层油气藏成藏与分布——以南苏门答腊盆地北部为例[J].石油勘探与开发,2009,36(1):120-126.
[6]罗群,郑德山,孙宏智.地质-地震综合地层划分对比法及其应用[J].江汉石油学报,2001,23(1):26-29.
[7]丁次乾.矿场地球物理[M].山东东营:中国石油大学出版社,2008:341-343.
[8]杨伟利,陈义宝.八面河地区孔店组河流—冲积相层序地层学研究[J].西安石油大学学报(自然科学版),2008,23(4):26-30.
[9]吴嘉鹏,王英明,马贵明,等.孟加拉扇某区块地层层序划分及电性地震相识别[J].岩性油气藏,2010,22(2):70-73.
[10]张永华,陈萍,赵雨晴,等.基于合成记录的综合层位标定技术[J].石油地球物理勘探,2004,39(1):92-96.
[11]杨海长,周玉.合成记录在层位标定应用中的几个关键问题[J].西南石油大学学报(自然科学版),2009,31(4):52-57.
[12]张若祥,李建平,刘志刚,等.渤海中部馆陶组层序地层特征及底部界限研究[J].海洋石油,2010,30(3):19-25.
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