Geological modeling method for deepwater gravity flow reservoirs under sparse well conditions
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摘要:
深水油气田普遍具有钻井少、井距大、地震资料分辨率有限的特征,深水重力流储层发育多级次构型单元,砂体空间展布与叠置关系复杂,常规建模方法难以兼顾地质模式合理性与储层非均质性精细表征,给少井条件下储层地质建模带来了挑战。以珠江口盆地白云凹陷A气田为例,提出了一套适用于少井条件的深水重力流储层地质建模方法。该方法在井震联合约束下采用“层次约束、逐级嵌套”的核心思路。在第1层次建模中,将解译的复合水道剖面通过空间映射机制转化至三维网格,采用确定性和随机性结合的方法构建复合水道模型。在第2层次建模中,针对复合水道模型,通过构建反映单一水道形态与叠置关系的三维训练图像,利用多点地质统计学算法精细刻画单一水道和泥岩;针对朵叶复合体,采用基于目标的建模方法建立泥岩模型。最后,按照层次优先级对各级沉积单元进行嵌套融合,建立三维沉积相模型,并以此为基础构建储层物性模型。结果表明,相较于确定性建模方法,本方法更精准地表征了深水重力流储层的非均质性与砂体空间展布,模型精度显著提升。研究成果为深水重力流储层的勘探开发和决策提供了可靠的理论基础和技术支撑。
Abstract:ObjectiveDeepwater oil and gas fields are typically characterized by sparse wells, large well spacing, and limited seismic data resolution. Deepwater gravity flow reservoirs develop multilevel architectural units, with complex spatial distribution and stacking relationships of sand bodies. Conventional modeling methods struggle to simultaneously ensure the rationality of geological patterns and the fine characterization of reservoir heterogeneity, posing challenges for geological reservoir modeling under sparse well conditions.
MethodsTaking the gas field A in the Baiyun Sag, Pearl River Mouth Basin as a case study, this study proposed a geological modeling method for deepwater gravity flow reservoirs suitable for sparse well conditions. Under joint well-seismic constraints, this method adopted the core concept of "hierarchical constraint and level-by-level nesting". In the first-level modeling, the interpreted channel complex profiles were transformed into a 3D grid through a spatial mapping mechanism, and a combined deterministic and stochastic approach was employed to construct the channel complex model. In the second-level modeling, for the channel complex model, 3D training images reflecting the morphology and stacking relationships of single channels were constructed. Additionally, a multiple-point geostatistics algorithm was utilized to finely characterize single channels and mudstones. For the lobe complex, an object-based modeling method was adopted to establish the mudstone model. Finally, sedimentary units at all levels were nested and integrated according to hierarchical priority to establish a 3D sedimentary facies model, based on which a reservoir petrophysical model was constructed.
ResultsThe results demonstrated that, compared with deterministic modeling methods, the proposed method more accurately characterized the heterogeneity and spatial distribution of sand bodies in deepwater gravity flow reservoirs, significantly improving model accuracy.
ConclusionThe research findings provide a reliable theoretical basis and technical support for the exploration, development, and decision-making of deepwater gravity flow reservoirs.
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表 1 复合水道剖面数据集(部分)
Table 1. Dataset of channel complex profiles
水道
编号中线节点
编号中线节点
X坐标中线节点
Y坐标中线节点
Z坐标水道宽度
$ W(n) $/m剖面水道深度
$ T(n) $/m6 1 0 0 0 496 22 2 491 − 2648 70 537 21 3 −106 − 5033 108 413 27 4 112 − 7283 175 500 25 5 −59 − 8032 186 372 21 6 −265 − 8970 185 280 22 注:n为复合水道中线节点的编号 -
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