柴达木盆地昆北地区的地震解释技术
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摘要
通过昆北连片二、三维地震资料联合解释,明确了柴达木盆地昆北地区的地质结构,应用地震叠前深度偏移处理、解释技术落实了构造形态和细节,应用陆相层序地层学分析技术获得切16等井区勘探突破,并取得以下认识:①昆北地区呈南北分带、东西分块的构造格局,以一级断层为界划分为北部跃进斜坡—切克凹陷—乌南斜坡带、南部山前凹陷带和中央昆北断阶带三个构造单元;②昆北断层上盘断层走向主要为南北向或北东向、北西向,靠近区域大断层地层较破碎,小断层发育;③发现了切16井路乐河组(E1+2)地层超覆圈闭,其中以湖进体系域的砂砾岩为主要储层段,以最大湖泛面附近厚为20～40m的较稳定泥岩为区域盖层,具有形成地层(岩性)圈闭的良好条件;④利用KL Inversion、Geocyber技术对E1+2的油气检测结果表明,含油主体位置均位于切163井附近,圈定的切16井区有利含油面积为33km2,并在切15井以东发现新目标,有利含油面积为12km2,含油检测结果与钻探结果吻合程度很高。
The geologic structure of Kunbei area of Qaidam Basin is discovered through interpretation of amount of 2D and 3D seismic data.The structural features and details are implemented using pre-stack depth migration and interpretation.Commercial pool are found from Q16 and other wells using sequence stratigraphy.The result indicates that the structural framework of Kunbei area shows north-south zonation and east-west segregation,and three tectonic units including Qiexi slope belt-Qiekelike sag-Wudong slope belt,southern piedmont sag belt and central Kunbei fault-step belt are divided by the first-order faults.The upfaulted block faults of the Kunbei fault with mainly SN or NE or NW strike are more broken nearby the major fault and a large number of small faults around.Stratigraphic overlap trap in Lulehe group(E1+2) of Q16 well zone is found.The glutenite of lake system tract is mainly reservoir section and a more stable mudstone with 20~40m thick nearby the maximum flooding surface is regional cap rock.All of these are conducive to form the strati-lithologic trap.Using hydrocarbon detection technology,it is found that the main oil Lulehe group(E1+2) is located near the Q163 well.Prospective oil-bearing area of Q16 well is 33km2.A 12km2 new oil-bearing area located in the east of Q15 well is found.In short,prospective oil-bearing area by hydrocarbon detection is consistent with drilling results.
The geologic structure of Kunbei area of Qaidam Basin is discovered through interpretation of amount of 2D and 3D seismic data.The structural features and details are implemented using pre-stack depth migration and interpretation.Commercial pool are found from Q16 and other wells using sequence stratigraphy.The result indicates that the structural framework of Kunbei area shows north-south zonation and east-west segregation,and three tectonic units including Qiexi slope belt-Qiekelike sag-Wudong slope belt,southern piedmont sag belt and central Kunbei fault-step belt are divided by the first-order faults.The upfaulted block faults of the Kunbei fault with mainly SN or NE or NW strike are more broken nearby the major fault and a large number of small faults around.Stratigraphic overlap trap in Lulehe group(E1+2) of Q16 well zone is found.The glutenite of lake system tract is mainly reservoir section and a more stable mudstone with 20~40m thick nearby the maximum flooding surface is regional cap rock.All of these are conducive to form the strati-lithologic trap.Using hydrocarbon detection technology,it is found that the main oil Lulehe group(E1+2) is located near the Q163 well.Prospective oil-bearing area of Q16 well is 33km2.A 12km2 new oil-bearing area located in the east of Q15 well is found.In short,prospective oil-bearing area by hydrocarbon detection is consistent with drilling results.
引文
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[2]王云波,陈元忠,沈亚,贾新友.柴北缘地区区带评价与目标优选.石油地球物理勘探,2006,41(增刊):66～69Wang Yun-bo,Chen Yuan-zhong,Shen Ya and JiaXin-you.Regional evaluation and targets optimizationin north Qaidam margin.OGP,2006,41(Supple-ment):66～69
[3]谢结来,曹强等.阿尔及利亚大深度低幅度构造地震解释技术应用及效果.石油地球物理勘探,2008,43(增刊1):108～114Xie Jie-lai,Cao Qiang et al.Application of seismic in-terpretation technique in Algeria deeper and low-am-plitude structure and effect.OGP,2008,43(Supple-ment 1):108～114
[4]赵文智.石油地质理论与方法进展.北京:石油工业出版社,2006
[5]陈海清,戴晓云等.时间剖面上的假构造及其解决方法.石油地球物理勘探,2009,44(5):590～596,602Chen Hai-qing,Dai Xiao-yun et al.False structures ontime domain seismic sections and corresponding reso-lutions.OGP,2009,44(5):590～596,602
[6]周海民,董月霞.陆相断陷盆地层序地层学工作方法.北京:石油工业出版社,2006
[7]刘震,赵阳等.隐蔽油气藏形成与富集.北京:地质出版社,2007
[8]周英杰.裂缝性潜山油藏表征与预测.北京:石油工业出版社,2006
[9]Dossary Saleh Al and Marfurt Kurt J.3Dvolumetricmultispectral estimates of reflector and roation.Geo-physics,2006,71(1):41～47
[10]Satinder Chopra and Kurt Marfurt.Curvature attrib-ute applications to 3Dsurface seismic data.The Lead-ing Edge,2007,26(4):404～414
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