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首页> 外文期刊>Energy Exploration & Exploitation >Experimental investigation of reservoir characteristics of the upper Ordovician Wufeng Formation shale in middle-upper Yangtze region, China
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Experimental investigation of reservoir characteristics of the upper Ordovician Wufeng Formation shale in middle-upper Yangtze region, China

机译：长江中上游地区奥陶系五峰组页岩储层特征的实验研究

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摘要

The main lithofacies of the upper Ordovician Wufeng Formation is black shale, which is one of the most important source rocks of shale gas reservoir in middle-upper Yangtze region, SW China. To make a convincing study on the reservoir characteristics of Wufeng Formation, four rock core samples were collected from an exploration shale gas well and their mineral composition, pore characteristics, specific surface area, organic geochemical characteristics, organic matter maturity, and methane adsorption capacity were analyzed. The results show that clay minerals and quartz are the major mineral composition of Wufeng Formation shale, and the Brittleness Index indicates a possible better efficiency during the prospective hydraulic fracture process. The pore types of Wufeng Formation shale are various, and the total pore porosity ranges between 2.19% and 2.97%, while the permeability ranges from 0.12 x 10(-3) mu m(2) to 0.18 x 10(-3) mu m(2), and the specific surface area varies between 11.52 cm(2)/g and 19.73 cm(2)/g. The total organic carbon content of Wufeng Formation shale varies between 3.22% and 4.87%, representing the great hydrocarbon generation ability, while the R-o stably ranges between 2.48% and 2.60% and presents an over-mature stage so that mass generation of hydrocarbons from shales occurred during the geological history. Compared with the existing information of some shales from different geological ages in middle-upper Yangtze region, Wufeng Formation shales possibly have a relatively preferable methane adsorption capacity. In general, despite it possesses a thinner thickness, as for as its reservoir characteristics, Wufeng Formation plays an unneglectable role in the reservoir combination system of Wufeng Formation and its overlying the Lower Silurian Longmaxi Formation.
机译：奥陶纪五峰组上部的主要岩相为黑色页岩，它是中国西南扬子地区页岩气藏最重要的烃源岩之一。为了对五峰组的储层特征进行令人信服的研究，从勘探页岩气井中采集了四个岩心样品，并对其矿物组成，孔隙特征，比表面积，有机地球化学特征，有机质成熟度和甲烷吸附能力进行了分析。分析。结果表明，粘土矿物和石英是五峰组页岩的主要矿物组成，脆性指数表明在预期的水力压裂过程中可能具有更好的效率。五峰组页岩的孔隙类型多种多样，总孔隙度在2.19％至2.97％之间，渗透率在0.12 x 10（-3）微米（2）至0.18 x 10（-3）微米之间。 （2），并且比表面积在11.52 cm（2）/ g和19.73 cm（2）/ g之间变化。五峰组页岩的总有机碳含量在3.22％至4.87％之间变化，表现出强大的生烃能力，而Ro稳定在2.48％和2.60％之间，呈现出过熟阶段，使得页岩大量生烃发生在地质史上。与已有的长江中上游地区不同地质年龄的页岩的现有信息相比，五峰组页岩可能具有相对较好的甲烷吸附能力。通常，尽管五峰组厚度较薄，但就其储层特征而言，在五峰组及其上下志留统龙马溪组的储层组合体系中起着不可忽视的作用。

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