Application of the multi-information seismic-constrained reservoir modeling in extra-low permeability reservoir development
Received date: 2024-03-18
Online published: 2025-03-13
Copyright
The Chang6 reservoir of Ansai Oilfield in the eastern Ordos Basin is a representative example of a low-porosity and extra-low permeability reservoir, characterized by unfavorable physical properties and significant heterogeneity.Traditional reservoir modeling methods are difficult to effectively describe the heterogeneity changes between reservoirs in low-porosity and extra-low permeability reservoirs, which cannot meet the needs of precise oilfield development plan adjustment.Therefore, in order to meet the technical requirements of increasing oil production, the seismic reservoir modeling technology for low-porosity and extra-low permeability reservoirs is explored based on the development seismic of the first block in Ordos Basin.The multi-information seismic-constrained reservoir modeling is proposed.On the basis of combined well-seismic structural modeling and fracture modeling, combined with seismic attributes, the sedimentary microfacies model was constructed by deterministic modeling method based on the results of single-sand level sedimentary microfacies.Under the constraints of sedimentary microfacies model and spatial classification of seismic lithology probability body, a high-precision lithofacies model is established by using sequential Gaussian simulation method.Based on the lithofacies model, the seismic porosity inversion body is usedto further constrain the spatial classification and establish the porosity model.The permeability model is calculated by the empirical formula of pore-permeability relationship, and the oil saturation model is established by Kriging interpolation method. The results show that the seismic constrained reservoir model exhibits evident features of evolving reservoir physical properties, well-defined reservoir boundaries, and clear interlayer configuration relationships.The reliability of the reservoir model established through this technology is further substantiated by analyzing production dynamic data, enabling precise characterization of multi-stage thin sand-body reservoir groups.The technology takes advantage of abundant information of lateral changes of development seismic, solves the problem of inter-well uncertainty of traditional stochastic simulation modeling method, and realizes fine characterization of physical property distribution law of significant heterogeneous reservoirs.The seismic constrained reservoir model has been applied to perfect the corresponding relationship between injection and production and reservoir edge expansion.It provides effective technical support for the stable production of Ansai oilfield and promotes the application of development seismic in Ordos Basin.
FuKun GAO , LiPing ZHOU , DongYang LI , YingLi ZHAO , JunRu LIU , JinChuan DUAN , GuiFang ZHANG . Application of the multi-information seismic-constrained reservoir modeling in extra-low permeability reservoir development[J]. Progress in Geophysics, 2025 , 40(1) : 121 -130 . DOI: 10.6038/pg2025HH0400
图2 井震结合刻画单砂体沉积微相(a)王窑南地区桥AA单井沉积相图；(b)王窑南地区长6层地震平均振动能量属性平面图; (c)王窑南地区长61121层沉积微相平面图; (d)王窑南地区长6段沉积微相模型图. Fig 2 Combining well seismic analysis to characterize sedimentary microfacies of single sand bodies (a)The phase diagram of Qiao AA in south Wangyao block; (b) The average vibration energy seismic attribution of chang6 reservoir in south Wangyao block; (c) The sedimentary facies plan of chang61121 reservoir in south Wangyao block; (d) The sedimentary facies model of chang6 reservoir in south Wangyao block. |
图3 王窑南地区地震岩性概率体约束岩相模型及随机模拟岩相模型建模结果(a)地震约束岩相模型立体图；(b)离散随机模拟岩相模型立体图；(c)地震岩性概率体剖面图；(d)地震约束岩相模型剖面图；(e)离散随机模拟岩相模型剖面图. Fig 3 Seismic-constrained rock phase model and discrete stochastic simulated rock phase model in south Wangyao block (a)Seismic-constrained rock phase model; (b) Discrete stochastic simulated rock phase model; (c) Seismic lithologic probability profile map; (d) Seismic-constrained rock phase model profile map; (e) Discrete stochastic simulated rock phase model profile map. |
图4 王窑南地区地震孔隙度反演体约束孔隙度模型及离散随机模拟孔隙度模型剖面结果(a)地震孔隙度反演体剖面；(b)地震约束孔隙度模型剖面；(c)离散随机模拟孔隙度模型剖面. Fig 4 The profile map for seismic-constrained porosity model and discrete stochastic simulated porosity model in south Wangyao block (a) Seismic porosity inversion volume profile map; (b) Seismic-constrained porosity model profile map; (c) Discrete stochastic simulated porosity model profile map. |
图5 王窑南地区地震约束含油饱和度模型剖面及离散随机模拟含油饱和度模型(a)地震约束饱和度模型剖面；(b)离散随机模拟饱和度模型. Fig 5 The profile map for seismic constraint oil saturation model profile and discrete stochastic simulated oil saturation model in south Wangyao block (a) Seismic-constrained oil-saturation model profile map; (b) Discrete stochastic simulated oil-saturation model profile map. |
感谢审稿专家提出的修改意见和编辑部的大力支持！
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