【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。更多还原

【Abstract】 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.更多还原