Types of lithofacies in the Lower Cambrian marine shale of the Northern Guizhou Region and their suitability for shale gas exploration

IF 4.2 3区 工程技术 Q2 ENERGY & FUELS
Lingyun Zhao , Peng Xia , Yong Fu , Ke Wang , Yuliang Mou
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Abstract

The lithofacies and thermal maturity of the over-mature Lower Cambrian marine shale in the Northern Guizhou Region, and their impacts on reservoir properties in this shale were analyzed by combining geochemistry, mineralogy, and gas adsorption methods. Ten lithofacies were identified, and the dominant lithofacies in the studied shale are lean-total organic carbon (TOC) argillaceous-rich siliceous shale (LTAS), medium-TOC siliceous shale (MTSS), and rich-TOC siliceous shale (RTSS). Since the gas generation potential of organic matter was weak, meso- and macro-pores were compressed or filled during the thermal evolution stage with a vitrinite reflectance (RO) range of 3.0%–4.0%. The controlling factors for methane adsorption capacity in the shale samples are significantly influenced by TOC content rather than thermal maturity. Among the RTSS, MTSS, and LTAS samples, RTSS exhibits the highest favorability for preserving hydrocarbon gas, followed by MTSS. The shale types in this study play a significant role in determining the properties of shale reservoirs, serving as an effective parameter for evaluating shale gas development potential. The RTSS and MTSS with a RO range of 2.0%–3.0% stand out as the most favorable target shale types for shale gas exploration and development.
贵州北部地区下寒武统海相页岩的岩相类型及其对页岩气勘探的适宜性
结合地球化学、矿物学和气体吸附等方法,分析了贵州北部地区下寒武统过熟海相页岩的岩性、热成熟度及其对储层性质的影响。研究发现了 10 个岩相,其中最主要的岩相是贫有机碳(TOC)霰粒状富硅质页岩(LTAS)、中有机碳(TOC)硅质页岩(MTSS)和富有机碳(TOC)硅质页岩(RTSS)。由于有机质的产气潜力较弱,中孔和大孔在热演化阶段被压缩或填充,玻璃光泽反射率(RO)范围为 3.0%-4.0%。页岩样品甲烷吸附能力的控制因素主要受 TOC 含量的影响,而不是热成熟度。在 RTSS、MTSS 和 LTAS 样品中,RTSS 对碳氢化合物气体的保存能力最强,其次是 MTSS。本研究中的页岩类型在决定页岩储层性质方面起着重要作用,是评估页岩气开发潜力的有效参数。RO范围为2.0%-3.0%的RTSS和MTSS是页岩气勘探和开发最有利的目标页岩类型。
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来源期刊
Natural Gas Industry B
Natural Gas Industry B Earth and Planetary Sciences-Geology
CiteScore
5.80
自引率
6.10%
发文量
46
审稿时长
79 days
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