河南省石炭-二叠系海陆过渡相页岩气成藏地质条件

邵龙义; 张亮; 张敬凯; 王德伟; 石彪; 付亚飞; 徐连利; 宋建军

河南省石炭-二叠系海陆过渡相页岩气成藏地质条件

1.
中国矿业大学(北京)地球科学与测绘工程学院,北京100083;2.河南省煤田地质局资源环境调查中心,河南郑州450053;3.河南省煤田地质局,河南郑州450016

基金项目: 河南省国土资源厅2014年“两权价款”地质科研项目(2015258-15);国家科技重大专项(2016ZX05041-004)

详细信息

作者简介:
邵龙义(1964—),男,河南灵宝人,教授,博士生导师,从事煤田地质学研究。

中图分类号: P618.1
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出版历程
- 收稿日期: 2016-07-15
- 刊出日期: 2016-12-28

Accumulation conditions of shale gas in transitional marine-continental coal measures of the Carboniferous-Permian in Henan Province

1.
College of Geoscience and Surveying Engineering,China University of Mining and Technology,Beijing 100083,China;2.Resources and Environment Survey Center,Provincial Administration of Coalfield Geology of Henan,Zhengzhou,Henan 450053,China;3.Provincial Administration of Coalfield Geology of Henan,Zhengzhou,Henan 450016,China

摘要

摘要: 河南省石炭-二叠系是一套海陆过渡相的含煤岩系,其中的泥页岩是潜在的页岩气层位,具有有效泥页岩单层厚度变化大、累计厚度大等特点.本文利用区内石炭-二叠系露头及钻孔岩芯资料,通过泥页岩的总有机碳含量(ω_TOC)测定、干酪根镜检、镜质组反射率测定、X射线衍射分析、低温氮气吸附实验等,对页岩气的成藏地质条件和储层特征进行了研究.结果表明,河南石炭-二叠系泥页岩有机质丰度高,太原组、山西组、下石盒子组有机碳含量分别为0.95%～8.04%、0.78%～9.41%、0.20%～2.13%;干酪根类型主体为Ⅲ型,部分为Ⅱ₂型;热演化程度为成熟—过成熟,利于干气的形成,区域上呈带状分布,以焦作—周口一带成熟度最高,向南、向北逐渐降低.XRD分析表明,泥页岩的黏土矿物含量为62%,脆性矿物含量为34.1%,决定了泥页岩的吸附能力较强而可压裂性较差.黏土矿物组成以伊利石/蒙脱石间层矿物(57.1%)和高岭石矿物(23.5%)为主,利于孔隙空间的形成.泥页岩孔隙率为1.0%～4.5%,渗透率为0.003～0.032mD.低温氮气吸附实验显示,泥页岩孔隙形态类型以平行板狭缝状孔和倾斜板狭缝状孔为主,介孔提供绝大部分孔隙比表面积和总孔体积.泥页岩含气性较好,含气量为1～3m³/t,具备页岩气成藏的含气性条件.综合分析认为,太原组中部硅质碎屑岩段(H₁)与山西组底部(H₂)泥页岩具有较好的生烃潜力,保存条件好或受区域热事件影响较低的地区是重点勘探区。
- 页岩气 /
- 海陆过渡相 /
- 成藏条件 /
- 石炭-二叠系 /
- 储层特征 /
- 河南省
Abstract: The Carboniferous-Permian strata in Henan Province are a set of coal-bearing series of transitional marine-continental facies,of which the mudstones have potentials for shale gas exploration.The mudstones are characterized by a variable thickness of the individual effective mudstone layer and a huge accumulative thickness.In this paper,we utilized the outcrop and borehole core data and investigated the accumulation conditions and the reservoir characteristics of the shale gas in the Carboniferous and Permian coal-bearing strata of Henan Province.The total organic carbon (TOC),organic matter types,thermal evolution degree,contents of brittle minerals and clay minerals,and pore morphological types of the mudstones were determined by the TOC analyzer,microscopic identification of kerogen,reflectance measurement of vitrinite,X-ray diffraction (XRD),low temperature nitrogen gas adsorption,respectively.The results showed that the abundance of organic matters of the mudstones was relatively high,with the TOC contents in the mudstones of the Taiyuan,Shanxi and Xiashihezi Formations being 0.95%～8.04%,0.78%～9.41% and 0.2%～2.13%,respectively.The types of organic matter were dominated by type Ⅲ,followed by type Ⅱ₂.The thermal evolution degree ranged from mature to over-mature stage which was favorable for the formation of dry gas.The maturity of the mudstones had a zoned distribution,with the highest maturity being distributed along the Jiaozuo-Zhoukou belt and the lower maturity being distributed towards the south and north from this belt.The XRD analysis showed that the clay minerals of the mudstones could account for 62.0% while the brittle minerals only accounted for 34.1%,indicating that the mudstones had a higher gas adsorption capacity but were difficult for hydraulic fracturing.The clay minerals were mainly composed of 57.1% of illite/smectite mixed layer and 23.5% of kaolinite,which were beneficial to the formation of pore space.The porosity of the mudstones ranged from 1.0% to 4.5%,and the permeability varied between 0.003 and 0.032 mD.The experiment of low temperature nitrogen gas adsorption revealed that the morphological types of the pores included the parallel plate-slit pores and the inclined plate-slit pores.The meso-pores provided the vast majority of specific surface area and total pore volume.The gas contents could reach 1.0～3.0 m³/t which is suitable for the condition of shale gas reservoir.It was concluded that the siliciclastic member in the middle Taiyuan Formation (H₁) and the basal part of the Shanxi Formation (H₂) have a higher hydrocarbon potential.The major favorable exploration areas are those having a good preservation condition or a less serious influence from the regional thermal events.
- shale gas /
- transitional marine-continental facies /
- accumulation condition /
- Carboniferous-Permian /
- reservoir characteristics /
- Henan Province

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参考文献(68)

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河南省石炭-二叠系海陆过渡相页岩气成藏地质条件

作者简介:
邵龙义(1964—),男,河南灵宝人,教授,博士生导师,从事煤田地质学研究。

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Accumulation conditions of shale gas in transitional marine-continental coal measures of the Carboniferous-Permian in Henan Province

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河南省石炭-二叠系海陆过渡相页岩气成藏地质条件

作者简介: 邵龙义(1964—),男,河南灵宝人,教授,博士生导师,从事煤田地质学研究。

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Accumulation conditions of shale gas in transitional marine-continental coal measures of the Carboniferous-Permian in Henan Province

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出版历程

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作者简介:
邵龙义(1964—),男,河南灵宝人,教授,博士生导师,从事煤田地质学研究。