从 Orzesze-1 号深探井的研究看上西里西亚煤盆地沉积中心煤层气的出现

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS
Sławomir Kędzior
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引用次数: 0

摘要

Orzesze-1 号勘探井于 2019-2020 年在上西里西亚煤盆地(USCB)的沉积中心钻探,深度为 3708 米(TVD)。煤层中的甲烷含量测试深度为 2840 米,煤的吸附能力测试深度为 2576 米。钻孔中甲烷含量的垂直分布显示出两个值得关注的深度区域,第一个在 883 米至 1300 米处(最大甲烷含量约为 12 立方米/吨 coaldaf),另一个在 1500-2840 米范围内,即最大测量深度处,因此该区域的实际下界深度尚不清楚。这两个区域之间有一个甲烷含量较低的区间,深度约为 1400 米,甲烷含量约为 5 立方米/吨 coaldaf,气体成分以甲烷为主(90%~90%),二氧化碳含量在深度为 2300 米时增加到约 15%。900-1300米处的甲烷含气区与高挥发性和中挥发性烟煤(第二煤化跃迁)含气区相对应,而在2800米深处的无烟煤中甲烷含量最高。煤层的甲烷吸附能力在 16 至 40 立方米/吨煤灰之间波动,无烟煤的甲烷吸附能力在 2800 米深处达到最大,此时岩石的温度接近 100 °C,沉积压力超过 28 兆帕。无烟煤的最高吸附能力源于其内部结构,其特点是以有序的芳香族薄片为主,并以玻璃岩大颗粒(占 70%)为主,其中含有积聚吸附甲烷的煤微孔。通过比较测试煤炭的吸附能力和测得的甲烷含量,发现煤炭的饱和度不足 11%-59%,但由于深层区域(深度达 1500 米)的瓦斯含量较高,该钻探区域可被视为煤层气(CBM)进一步勘探和开发的前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The occurrence of coalbed methane in the depocentre of the Upper Silesian Coal Basin in the light of the research from the Orzesze-1 deep exploratory well

The Orzesze-1 exploratory well with a depth of 3708 m (TVD) was drilled in 2019–2020 in the depocentre of the Upper Silesian Coal Basin (USCB). The methane content in the coal seams has been tested to a depth of 2840 m and the sorption capacity of the coal to a depth of 2576 m. These are the deepest measurements in the USCB so far. The vertical distribution of methane content in the borehole shows two depth zones of interest, the first at a depth 883 m to about 1300 m (maximum methane content about 12 m3/t coaldaf) and another in the range of 1500–2840 m, that is, to the maximum measurement depth, so the actual lower boundary depth of this zone is unknown. The maximum methane content here exceeds 18 m3/t coaldaf at a depth of >2800 m. Both zones are separated by an interval of reduced methane content of about 5 m3/t coaldaf at a depth of approximately 1400 m. The gas composition is dominated by methane (∼90%), and the content of carbon dioxide increases to approximately 15% at a depth of >2300 m. The methane-bearing zone at ∼900–1300 m corresponds to the zone of high- and medium-volatile bituminous coal (second coalification jump), while the highest methane content at a depth of >2800 m was determined in anthracite. The methane sorption capacity of the coal seams oscillates between 16 and 40 m3/t coaldaf with a maximum in anthracite at a depth of >2800 m, where the temperature of the rock approaches 100 °C and the deposit pressure exceeds 28 MPa. The highest sorption capacity in anthracite results from its inner structure characterised by the predominance of ordered aromatic lamellas and the dominance of vitrinite macerals (>70%), which contain coal micropores accumulating adsorbed methane. The comparison of the sorption capacity of the tested coal and the measured methane content displays undersaturation of 11–59%, however, due to significant gas content in the deep zone (depth > 1500 m), the drilling area can be considered as a prospect for further exploration and development of coalbed methane (CBM).

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来源期刊
International Journal of Coal Geology
International Journal of Coal Geology 工程技术-地球科学综合
CiteScore
11.00
自引率
14.30%
发文量
145
审稿时长
38 days
期刊介绍: The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.
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