Abstract This research investigates the use of mercury injection capillary pressure (MICP) analysis for pore structure characterization and wettability droplet analysis for mm-scale assessment of wetting properties, on rotary side-wall core samples in the bottom section of Lower Spraberry (Leonard shale) and Wolfcamp A units from Element Petroleum's Rogers #3804 E well in the Midland Basin, Howard county, Texas. Porosity, permeability, total organic carbon (TOC), pyrolysis and X-ray diffraction data were also acquired for both the Rogers #3804 E and Wright 44 #1 E wells. The roles of organic matter quantity, quality and maturity, along with mineralogy, and grain size, are considered in the development of multiple pore systems at nm-μm sizes and their implications for petroleum production. The Lower Spraberry unit is found to contain greater porosity and permeability (and associated lower tortuosity) than the Wolfcamp A unit. More importantly, the two formations show disparate pore-throat size distributions, with the Lower Spraberry unit samples containing more inter- and intra-particle pores (43.1 ± 27.1 nm in pore-throat diameters) conducive to petroleum movement and production, while the Wolfcamp A unit samples possesses smaller pores (10.5 ± 5.45 nm) that are probably organic matter-hosted. The amount of S1 (an indicator of oil content) is closely related to the proportion of pore volume controlled by 2.8–50 nm in pore-throat sizes that are likely organic matter-related. Differences in the behavior of petroleum production from the Rogers #3804 E (with slow decline) and Wright 44 #1 E (with steep decline) wells are manifested in the oil saturation index (S1 vs. TOC), which is tantalizingly linked to the differences in the predominant pore-throat size distributions observed above.

中文翻译：

---

美国德克萨斯州霍华德县 Wolfberry Play 的纳米岩石物理和有机地球化学耦合研究

摘要 本研究调查了使用压汞毛细管压力 (MICP) 分析进行孔隙结构表征和使用润湿性液滴分析进行毫米级润湿性能评估，对下斯普拉贝里（Leonard 页岩）底部的旋转侧壁岩心样品进行了研究。和 Wolfcamp A 单位来自 Element Petroleum 位于德克萨斯州霍华德县米德兰盆地的 Rogers #3804 E 井。还获得了 Rogers #3804 E 和 Wright 44 #1 E 井的孔隙度、渗透率、总有机碳 (TOC)、热解和 X 射线衍射数据。有机质数量、质量和成熟度以及矿物学和粒度的作用在 nm-μm 大小的多个孔隙系统的开发中被考虑到，以及它们对石油生产的影响。发现下 Spraberry 单元比 Wolfcamp A 单元具有更大的孔隙率和渗透率（以及相关的更低的弯曲度）。更重要的是，这两个地层显示出不同的孔喉尺寸分布，Lower Spraberry 单元样品含有更多的颗粒间和颗粒内孔（孔喉直径为 43.1 ± 27.1 nm），有利于石油运动和生产，而 Wolfcamp一个单位样品具有较小的孔隙 (10.5 ± 5.45 nm)，可能是有机物质。S1（含油量指标）的量与孔喉尺寸中受 2.8-50 nm 控制的孔体积比例密切相关，可能与有机质有关。