苏里格气田苏5区块储层地震反演预测技术
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摘要
苏里格气田二叠系气藏属非均质性极强、低孔、低渗的河流—三角洲砂岩岩性气藏,有效储层厚度小、横向变化大,这对气田的勘探开发提出了极大的挑战。由于砂岩储层岩性圈闭本身的复杂性,常规反演与解释技术难以满足对苏里格地区二叠系砂岩储层预测的需求。为准确预测盒8段砂体及有效砂体的纵横向分布、精确提供井位和高效开发盒8段气藏,基于苏5区块2004年三维地震资料开展了地震反演研究工作,以期能寻找到适应本区域的反演方法。经过多种方法的比较,发现基于统计学的随机地震反演技术能有效预测苏里格气田二叠系砂岩储层的分布,通过对该区块地震资料的处理,得到了盒8段的有效砂体分布范围,所部署的开发井都取得了高产油气流,取得了明显的经济效益。
The Permian gas reservoir in Sulige gas field belongs to fluvial-delta sandstone lithologic gas reservoir with strong heterogeneity, low porosity and low permeability, moreover, the effective reservoir is thin with strong lateral thickness variations, which will bring great challenges for the gas field exploration and development. Due to the complexity of the lithologic trap in the sandstone reservoir, the conventional inversion and interpretation technique can't meet the requirements for Permian sandstone reservoir prediction in Sulige area. In order to accurately predict the sandstone bodies in He 8 reservoir section, as well as the vertical and horizontal distribution of the effective sandstone bodies, and provide accurate drilling well locations and effectively exploit the gas reservoir in He 8 section, the paper developed seismic inversion research for seeking the suitable inversion method with 3D seismic data acquired in the block Su-5 in 2004. Through comparisons among many inversion methods, the paper put forward that the statistics-based stochastic seismic inversion technique can predict the sandstone reservoir distribution in Permian in Sulige gas field effectively. The effective sandstone distribution extents have been obtained by using the processed seismic data, besides, the commercial gas flow has been found in the proposed drilling wells, and remarkable economical effects have been gained.
The Permian gas reservoir in Sulige gas field belongs to fluvial-delta sandstone lithologic gas reservoir with strong heterogeneity, low porosity and low permeability, moreover, the effective reservoir is thin with strong lateral thickness variations, which will bring great challenges for the gas field exploration and development. Due to the complexity of the lithologic trap in the sandstone reservoir, the conventional inversion and interpretation technique can't meet the requirements for Permian sandstone reservoir prediction in Sulige area. In order to accurately predict the sandstone bodies in He 8 reservoir section, as well as the vertical and horizontal distribution of the effective sandstone bodies, and provide accurate drilling well locations and effectively exploit the gas reservoir in He 8 section, the paper developed seismic inversion research for seeking the suitable inversion method with 3D seismic data acquired in the block Su-5 in 2004. Through comparisons among many inversion methods, the paper put forward that the statistics-based stochastic seismic inversion technique can predict the sandstone reservoir distribution in Permian in Sulige gas field effectively. The effective sandstone distribution extents have been obtained by using the processed seismic data, besides, the commercial gas flow has been found in the proposed drilling wells, and remarkable economical effects have been gained.
引文
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[2]邹新宁.鄂尔多斯盆地苏里格气田河道砂体识别研究[D].西北大学,2006.
[3]徐明华,王绪本,李学华.自然伽马反演在双家坝构造飞仙关组鲕滩储层预测中的应用[J].石油物探,2003(3).
[4]邹新宁,孙卫,王大兴,等.苏里格气田盒8段低渗砂岩储层的预测[J].石油物探,2005(6).
[5]吴大奎,李亚林,伍志明,等.地震、测井资料联合反演的神经网络算法研究[J].天然气工业,2004,24(3):55-57.
[6]王赟,王妙月,彭苏萍.地球物理随机联合反演[J].地球物理学报,1999(S1).
[7]卢文东,李伟,路云峰.榆林—神木气田上古生界具不同产能的砂岩气层特征分析[J].天然气工业,2006,26(7):54-56.
[8]于忠平,贾亚妮,姬红,等.鄂尔多斯盆地东部上古生界碎屑岩储层特征[J].天然气工业,2002,22(6):27-30.
[9]王建国,何顺利,刘婷婷,等.榆林气田山2段低渗砂岩储层测井综合评价[J].西南石油大学学报,2007,29(1):54-56.
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