Characterization of marine-terrigenous transitional Taiyuan formation shale reservoirs in Hedong coal field, China
Characterization of marine-terrigenous transitional Taiyuan formation shale reservoirs in Hedong coal field, China
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DOI：
10.26804/ager.2018.01.07
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发表时间：
2018-03
期刊：
影响因子：
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通讯作者：
Li Kunjie;Chen Gang;Li Wei;Wu Xin-long;Tan Jinchong;Qu Jiangwen
中科院分区：
文献类型：
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作者：
Li Kunjie;Chen Gang;Li Wei;Wu Xin-long;Tan Jinchong;Qu Jiangwen
为了更好地了解河东煤田海陆过渡相太原组页岩储层的基本特征，对某页岩气探井（SL-1）的33个岩心样品进行了储层评价实验。结果表明，TYS有机质为Ⅲ型气敏干酪根，处于高成熟阶段，Ro值平均为1.87%（1.71 ~ 2.10%）。总有机碳含量为0.29%~ 11.87%，平均为2.91%，含气量为0.41 ~ 2.96 ml/g，表明尽管地史上曾大量生烃，但TYS仍具有一定的生烃潜力。XRD分析表明，TYS主要由石英矿物和粘土矿物组成，平均脆性指数为46.5%，对水力压裂较为有利。TYS的孔径范围从几纳米到几百纳米。渗透率与孔隙度无关，均小于0.1md。BET比表面积和BJH体积的平均值分别为8.57 m2/g和1.84 cm 3/100 g。与以往的研究类似，TOC含量是本研究中气体吸附能力的决定性控制因素。
To better understand the basic characteristics of Marine-terrigenous Transitional Taiyuan formation shale (TYS) reservoirs in Hedong coal field, a series of reservoir evaluation experiments were conducted on 33 core samples, which were collected from an exploration shale gas well (SL-1). The results show that organic matters in TYS are Type III gas prone kerogen and are in the high-maturity stage with an average Ro value of 1.87% (ranging from 1.71 to 2.10%). The total organic carbon (TOC) is ranging from 0.29% to 11.87% with an average value of 2.91% and gas content is from 0.41 to 2.96 ml/g, which indicates that TYS still has certain hydrocarbon generation potential despite a mass generation of hydrocarbons occurred during the geological history. XRD analysis shows that TYS is composed mainly of quartz minerals and clay minerals with an average brittleness index of 46.5%, which is relatively favorable for hydraulic fracture. Pore size of TYS ranges from a few nanometers to hundreds of nanometers. The permeability is irrelevant with porosity and its values are all lower than 0.1 md. The average value of BET surface area and BJH volumes are 8.57 m2/g and 1.84 cm3/100g, respectively. Similar to previous studies, TOC content is a decisive control on gas adsorption capacity in this study.