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Classification of the tight oil reservoir storage space in the Raoyang Sag of the Jizhong Depression in the Bohai Bay Basin, China
Energy Science & Engineering ( IF 3.8 ) Pub Date : 2019-10-20 , DOI: 10.1002/ese3.510
Fangwen Chen 1, 2 , Qiang Zheng 1, 2 , Shuangfang Lu 1, 2 , Xue Ding 1, 2 , Yiwen Ju 3 , Hongqin Zhao 1, 2
Affiliation  

To improve the precision of predicting sweet spots in tight oil reservoirs, the classification of tight oil reservoir storage space is necessary. The tight oil reservoir in the lower submember of the first member of Shahejie Formation (Es1L) of the Raoyang Sag of the Jizhong Depression in the Bohai Bay Basin was selected as a case study for testing a new method of classifying tight oil reservoir storage space based on the results of porosity, permeability, and mercury intrusion porosimetry measurements. The pore‐throat size ranges were classified according to pore‐throat fractal characteristics and were divided into three groups: <100 nm, 100‐1000 nm, and >1000 nm. The oil‐bearing property of tight oil reservoir samples is closely related to the median and maximum pore‐throat radii. The inflection and intersection points in the trend lines of the pore volume percentages connected by different pore‐throat widths (<100 nm, 100‐1000 nm, and >1000 nm) vs the porosity and permeability values (which represent the relationship between the pore volume connectivity characteristics and porosity/permeability) were used as the basis for classifying the tight oil reservoir storage space. The tight oil reservoir storage space in the Es1L formation of the Raoyang Sag was divided into three categories, namely classes of III, II, and I. The porosity ranges of the three tight reservoir storage space classes are <5%, 5%‐8%, and 8%‐11%, respectively, and their permeability ranges are <0.04 mD, 0.04‐0.15 mD, and 0.15‐0.8 mD, respectively.

中文翻译:

渤海湾盆地冀中De陷饶阳凹陷致密油储集空间分类

为了提高致密油储层预测甜点的精度,必须对致密油储藏空间进行分类。沙河街组一期下子段致密油藏(E s 1L以渤海湾盆地冀中De陷饶阳凹陷为例,研究了根据孔隙度,渗透率和压汞法测量孔隙度的结果,对致密油储层进行分类的新方法。根据孔喉分形特征对孔喉尺寸范围进行分类,并分为三组:<100 nm,100-1000 nm和> 1000 nm。致密油藏样品的含油性与中值和最大孔喉半径密切相关。孔体积百分比趋势线中的拐点和交点由不同的孔喉宽度(<100 nm,100-1000 nm和> 孔隙率和渗透率值(代表孔隙体积连通性特征与孔隙度/渗透率之间的关系)与孔隙率和渗透率值(1000 nm)之间的关系用作对致密油储藏空间进行分类的基础。E区致密的储油空间小号1L的饶阳凹陷的形成被分成三类,即类III,II,以及I.三个紧水库蓄水空间类的孔隙率范围为<5%,5%-8%,和8%-11分别为%和它们的渗透率范围分别为<0.04 mD,0.04-0.15 mD和0.15-0.8 mD。
更新日期:2019-10-20
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