Controlling factors and predictions of well-connected pore-throat volumes in tight oil sandstones
Controlling factors and predictions of well-connected pore-throat volumes in tight oil sandstones
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致密油砂岩连通孔喉体积控制因素及预测
DOI：
10.1016/j.petrol.2022.111034
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发表时间：
2022-09
影响因子：
--
通讯作者：
Longkan Shao
中科院分区：
文献类型：
--
作者：
Hongping Liu;Yang Luo;Yanchao Zhao;Changmin Zhang;Sibin Zhou;Longkan Shao
利用水力压裂和水平井钻井技术开发致密砂岩油藏取得了成功。然而，这些储层中大约90%的石油仍然存在，储层评价方法对于有效提高石油采收率至关重要。致密储层中连通良好的孔喉是裂缝与微孔隙的连接部位，在提高采收率技术中，孔喉的存在可提高采收率。在这项研究中，地质因素，如储层质量，岩相，充油程度进行了调查，并讨论了它们与良好的孔喉体积（S顶点）的关系。多元线性回归和支持向量机（SVM）方法被用于S顶点预测。结果表明，S峰值随孔隙度/渗透率的增大而增大，然后又减小。对于流动区指示器（FZI），S顶点随着FZI增加而首先减小，然后略微增加。除了一些小规模的层理构造外，几乎所有岩相中都存在高S顶值。油饱和度的增加可能会增加S顶点，但一些岩石没有石油显示仍然有高S顶点值。高S峰值主要表现在两种情况：（1）靠近烃源岩的岩石，酸性溶解程度高，导致次生孔隙和自生粘土含量高; (2)远离烃源岩的岩石无油迹，胶结物含量高，主要指示碱性成岩环境。利用多元线性回归和SVM方法对S峰进行了预测，结果表明，由于两种高S峰岩石类型，SVM回归是一种较好的方法。不同S峰值的威尔斯井的生产数据表明，S峰对流体流动特性有很大影响。·丰富的毛细管压力曲线用于获得良好连接的孔喉体积（S apex）。· S顶点与孔隙度、渗透率和FZI之间没有很好的线性关系。·除小规模的顺层构造外，大部分岩相都存在高S顶。·具有良好或不良油显示的岩石可能具有高S顶点值。·使用SVM回归可以从常规测井曲线很好地估计S顶点。
Oil production from tight oil sandstone reservoirs has achieved success with the aid of hydraulic fracturing and horizontal well drilling technologies. However, approximately 90% of the oil in these reservoirs remains in place, and reservoir evaluation methods are essential for effective enhanced oil recovery. Well-connected pore throats constitute the connections between fractures and micropores in tight oil reservoirs and lead to high oil recovery levels when using enhanced oil recovery (EOR) methods. In this study, geological factors, such as reservoir quality, lithofacies, and oil charging extent, have been investigated, and their relationships with the well-connected pore-throat volume (S apex ) is discussed. Multiple linear regression and support vector machine (SVM) methods were used for S apex predictions. The results show that the S apex values increase as the porosity/permeability increase and then show a decrease. For the flow zone indicator (FZI), S apex first decreases as the FZI increases and then a slight increase. High S apex values can be present in nearly all lithofacies, except within some small-scale bedding structures. Increased oil saturations may increase the S apex, but some rocks with no oil shows still have high S apex values. High S apex values are mainly present in two cases: (1) Rocks located close to source rocks with high acidic dissolution levels resulting in secondary porosity and authigenic clay contents. (2) Rocks located far from source rocks that have no oil shows and high contents of chlorite cement, which mainly indicate alkaline diagenetic environments. Predictions of S apex using multiple linear regression and SVM methods indicate that SVM regression is a good method because of the two high S apex rock types. The production data from wells with different S apex values show that the S apex has a large effect on fluid flow properties. • Abundant capillary pressure curves were used to obtain the well-connected pore-throat volumes (S apex ). • S apex does not show good linear relationship with porosity, permeability and FZI. • High S apex exist in most all the lithofacies except for small-scale bedding structures. • Rocks with either good or bad oil show may have high S apex values. • S apex can be well estimated from the conventional well logs using SVM regression.
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DOI：
10.2118/154329-ms
发表时间：
2012
期刊：
--
影响因子：
--
作者：
B. Todd Hoffman
通讯作者：
B. Todd Hoffman
DOI：
10.2118/116105-ms
发表时间：
2008
期刊：
--
影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
E. Pittman
DOI：
--
发表时间：
2014
期刊：
Acta Geological Sinica
影响因子：
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作者：
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通讯作者：
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影响因子：
4.2
作者：
Panke Sun;Huaimin Xu;Hanqing Zhu;Langbo Jia;Xiaoni Hu;Huijing Fang;Hanqiao Jiang;Zhaohui Xu;Tongwen Jiang;Xu Jiang;Linfeng Tian
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