AGER, 2018, 2(1): 72-85 河东煤田海陆过渡相太原组页岩特征研究

宁坤

河东煤田海陆过渡相太原组页岩特征研究

AGER, 2018, 2(1): 72-85

原文网址：http://www.astp-agr.com/index.php/Index/Index/detail?id=51

河东煤田位于鄂尔多斯盆地东缘，南北长400公里，东西宽60公里，面积超过17000平方公里，是山西省的六大煤田之一，是目前中国实现商业化开发的重要煤层气基地。河东煤田不仅具有丰富的煤层气资源，也具有较好的页岩气和致密砂岩气资源潜力。

图1. 样本电镜扫描图像

煤系页岩在该区域内发育稳定，展布范围广，根据2012年中国国土资源部油气战略研究中心全国页岩气资源调查与评价结果显示河东煤田页岩气资源量为1.43万亿方，其中，大宁-吉县-乡宁区块被划定为页岩气资源勘查开发有利区。石炭二叠系太原组是河东煤田的主要含煤地层，含有多层与煤、砂岩和灰岩交互沉积的煤系页岩。目前，对河东煤田煤系页岩缺乏全面的研究，为了从多个角度系统认识河东煤田太原组页岩物性特征，本文通过一系列实验，对太原组页岩的有机质含量、类型、成熟度、含气量、矿物组成、孔径分布等特征进行了综合分析，旨在提高对煤系页岩的总体认识水平并对后期的页岩气，煤层气和砂岩气综合开发的提供借鉴。

Characterization of marine-terrigenous transitional Taiyuan formation shale reservoirs in Hedong coal field, China

Kunjie Li, Gang Chen, Wei Li, Xinlong Wu, Jinchong Tan, Jiangwen Qu

(Published: 2018-02-25)

Corresponding Author and Email:  

Kunjie Li, marden2008@163.com

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Citation: Li, K., Chen, G., Li, W., Wu, X., Tan, J., Qu, J. Characterization of marine-terrigenous transitional Taiyuan formation shale reservoirs in Hedong coal field, China. Advances in Geo-Energy Research, 2018, 2(1): 72-85, doi: 10.26804/ager.2018.01.07.

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Article Type: Original article

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Abstract:

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.

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Keywords: Marine-terrigenous transitional shale, Ordos basin, Hedong coal field, formation.