提高识别断裂带圈闭可靠性的地震方法——以克拉玛依油田克百断裂带为例
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摘要
复杂构造识别的可靠性,取决于地震资料的偏移归位成像精度,而可靠的归位成像取决于偏移速度场建立是否符合地质构造解释模型。求取高精度偏移速度,是约束地质构造模型做好叠前时间偏移的基础。为此,针对研究区复杂构造的地质特征,建立了合理的地震地质构造解释模型及相应的偏移速度场;依据斯奈尔定律,对三维地震资料进行了叠前时间偏移处理,得到了较可靠的归位成像;共解释5个断层地层圈闭(其中1个地层圈闭),刻画了3个二叠系夏子街组扇体,取得了较好的地震地质效果。
Reliable trap identification of complex structures depends on migration imaging precision of the seismic data,and the reliable migration imaging depends on the migration velocity field developed whether to be consistent with the geological interpretation model or not.Prestack time migrated is based on high-precision migration velocity which can constrain geological structure model.Taking the sedimentary evolution of complex structures in the study area into account,this paper presents a reasonable geological structure model and the corresponding migration velocity field.According to Snell's law,the prestack time migration processing to the 3-D seismic data is conducted,obtaining a more reliable migration imaging,finding out five fault stractigraphic traps among which one is a stratigraphic trap,describing 3 fan bodies of Xiazijie formation of the Permian.Good effects of seismology and geology are gained.
Reliable trap identification of complex structures depends on migration imaging precision of the seismic data,and the reliable migration imaging depends on the migration velocity field developed whether to be consistent with the geological interpretation model or not.Prestack time migrated is based on high-precision migration velocity which can constrain geological structure model.Taking the sedimentary evolution of complex structures in the study area into account,this paper presents a reasonable geological structure model and the corresponding migration velocity field.According to Snell's law,the prestack time migration processing to the 3-D seismic data is conducted,obtaining a more reliable migration imaging,finding out five fault stractigraphic traps among which one is a stratigraphic trap,describing 3 fan bodies of Xiazijie formation of the Permian.Good effects of seismology and geology are gained.
引文
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[6]吴雨韩,吴采西,瞿建华,等.克拉玛依中拐地区三工河组和八道湾组沉积相新认识[J].新疆石油地质,2010,31(6):590-592.
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[2]张传绩.准噶尔盆地西北缘大逆掩断裂带的地震地质依据及地震资料解释中的几个问题[J].新疆石油地质,1983,4(3):1-12.
[3]阎世信,刘怀山,姚雪根.山地地球物理勘探技术[M].北京:石油工业出版社,2000:148-151.
[4]高君,肖又军,彭更新,等.射线层析与波动方程联合成像[J].新疆石油地质,2010,31(6):654-656.
[5]韩文功,印兴耀,王兴谋,等.地震技术新进展[M].山东东营:石油大学出版社,2006:182-186.
[6]吴雨韩,吴采西,瞿建华,等.克拉玛依中拐地区三工河组和八道湾组沉积相新认识[J].新疆石油地质,2010,31(6):590-592.
[7]任兵,廖荣峰,陈勇,等.准噶尔盆地滴南凸起八道湾组煤系沉积环境及层序[J].新疆石油地质,2010,31(3):245-247.
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