鲁卜哈利盆地B区块近地表快速建模研究与应用
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摘要
沙特阿拉伯鲁卜哈利盆地B区块地表多为沙丘、戈壁,近地表地质条件复杂,横向速度变化大,静校正问题严重。B区块勘探程度低,微测井数量少,原有的近地表模型不能很好地解决资料处理中的静校正问题,给最终的处理结果带来影响。针对这一问题,在充分考虑油气勘探对数据处理的精度要求和时效性基础上,探讨了B区块近地表建模的难点,提出了一种快速近地表模型建立方法。首先将B区块划分为沙丘、戈壁和沙丘-戈壁过渡带等不同类型的近地表区域;然后根据划分结果分别采用不同的建模方法,对沙丘底面进行准确定义,对微测井空白区带的速度误差进行校正,将沙丘压实曲线应用到模型的建立中,最终获得了能准确描述B区块近地表介质特征的模型,解决了原模型在近地表速度变化区(带)、微测井空白区(带)描述中存在的问题。利用新建立的近地表模型对二维、三维地震资料进行了处理,得到了品质较好的叠加剖面。
Sand dunes and gobies are easily seen and the near surface geo- logical condition is very complex in Rubal-Khali basin,Saudi Ara- bia.Because of this,the horizontal velocity is quite unstable,mak- ing the static correction a hard problem.The original near surface model can not obtain a satisfactory solution for the statics problem due to the limited uphole survey and poor exploration status.Rele- vant studies were carried out and a fast near surface model building method was developed considering the requirements of exploration data accuracy and timeliness.Three kinds of near surface areas were divided,including sand dune area,gobi area,and transitional area.Different models were defined for the three areas based on the nature of the geological characteristics.With the accurate deft- nition of sand dune bottom,the velocity error in the uphole data blank area was corrected,the sand compaction curve was applied to the model establishment,and a near surface model for the entire block was built for more accurately describing the near surface characteristics.Problems existing in the description of velocity transitional area and data blank area were eventually solved.The newly established near surface model was applied in 2-D and 3-D seismic data process,obtaining good quality stacking pro{lies.
Sand dunes and gobies are easily seen and the near surface geo- logical condition is very complex in Rubal-Khali basin,Saudi Ara- bia.Because of this,the horizontal velocity is quite unstable,mak- ing the static correction a hard problem.The original near surface model can not obtain a satisfactory solution for the statics problem due to the limited uphole survey and poor exploration status.Rele- vant studies were carried out and a fast near surface model building method was developed considering the requirements of exploration data accuracy and timeliness.Three kinds of near surface areas were divided,including sand dune area,gobi area,and transitional area.Different models were defined for the three areas based on the nature of the geological characteristics.With the accurate deft- nition of sand dune bottom,the velocity error in the uphole data blank area was corrected,the sand compaction curve was applied to the model establishment,and a near surface model for the entire block was built for more accurately describing the near surface characteristics.Problems existing in the description of velocity transitional area and data blank area were eventually solved.The newly established near surface model was applied in 2-D and 3-D seismic data process,obtaining good quality stacking pro{lies.
引文
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7 Robert L,Ralph B.Development of near surface mod- els in Saudi Arabia for low relief structures and com- plex near surface geology[J].Expanded Abstracts of 73~(rd) Annual Internat SEG Mtg,2003,1992～1995
8 Dave Marsden.Static corrections—a review,partⅠ[J].The Leading Edge,1993,12(1):43～49
9 Dave Marsden.Static corrections—a review,partⅡ[J].The Leading Edge,1993,12(2):115～120
10 Dave Marsden.Static corrections—a review,partⅢ[J].The Leading Edge,1993,12(3):210～216
11林伯香，孙晶梅，徐颖，等．几种常用静校正方法的讨论[J]．石油物探，2006，45(4)：367～372
12陈广思．相对折射静校正方法[J]．石油地球物理勘探，1990，25(4)：407～428
13潘宏勋，方伍宝，武永山，等．改进的相对折射静校正方法[J]．石油物探，2003，42(2)：208～211
2刘治凡．基于浮动基准面的两步法静校正[J]．石油物探，1998，37(1)：136～142
3刘治凡，毛海波，邵雨，等．复杂地表区基准面和静校正方法的选择[J]．石油物探，2003，42(2)：240～246
4 Chandola S K,Anand P.Near-surface characteristics of Ariyalur-Pondicherry sub-basin and their relevance to seismic data acquisition and processing[J].Expand- ed Abstracts of 70~(th) Annual Internat SEG Mtg,2000, 1283～1286
5李满树，方伍宝，周腾，等．初至波走时信息在复杂地区近地表速度反演中的应用[J]．石油物探，2004，43 (1)：72～75
6李卫忠．复杂地表近地表建模与静校正[J]．油气地质与采收率，2007，16(3)：73～76
7 Robert L,Ralph B.Development of near surface mod- els in Saudi Arabia for low relief structures and com- plex near surface geology[J].Expanded Abstracts of 73~(rd) Annual Internat SEG Mtg,2003,1992～1995
8 Dave Marsden.Static corrections—a review,partⅠ[J].The Leading Edge,1993,12(1):43～49
9 Dave Marsden.Static corrections—a review,partⅡ[J].The Leading Edge,1993,12(2):115～120
10 Dave Marsden.Static corrections—a review,partⅢ[J].The Leading Edge,1993,12(3):210～216
11林伯香，孙晶梅，徐颖，等．几种常用静校正方法的讨论[J]．石油物探，2006，45(4)：367～372
12陈广思．相对折射静校正方法[J]．石油地球物理勘探，1990，25(4)：407～428
13潘宏勋，方伍宝，武永山，等．改进的相对折射静校正方法[J]．石油物探，2003，42(2)：208～211
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