贵州六盘水煤田构造煤储层特征与煤层气勘探开发方向

doi:10.13809/j.cnki.cn32-1825/te.2024.06.018

Abstract

Abstract:

Guizhou Province is rich in coalbed methane（CBM） resources; however, the development of tectonic coal constrains the increase of reserves and production. By studying the reservoir characteristics of tectonic coal in Guizhou, adaptable exploration and development technologies are proposed, providing a theoretical basis for the safe and efficient development of tectonic coal reservoirs in the province. Under the control of the heterogeneous mechanical properties of coal seams and the uneven distribution of tectonic stress fields, the phenomenon of stratification in tectonic coal is more prevalent. Taking the No. 11 coal seam in the Dahebian syncline of the Liupanshui Coalfield as an example, isothermal adsorption, mercury intrusion, low-temperature liquid nitrogen adsorption, and low-temperature CO₂ adsorption experiments were conducted to study the physical properties of each stratified reservoir. The formation mechanism of tectonic coal stratification in thick coal seams and the CBM enrichment pattern were discussed. The adaptability and applicability of exploration and development technologies for CBM in thick coal seams with complex coal structures were compared. The results showed that:1） The average thickness of the No. 11 coal seam in the Dahebian syncline was 4.48 m, and the formation of thick coal seams was the result of a balance between basin subsidence rates and sedimentary supply. Under subsequent compressional and thrust tectonic activities, the No. 11 coal seam underwent compression, fracturing, and even interlayer sliding, leading to the development of stratification in tectonic coal. Stress was concentrated in the middle stratification, where the mechanical properties of the coal were weaker. 2） The No. 11 coal seam exhibited a “sandwich” structure in the vertical direction, consisting of primary structural coal on top, mylonitic coal in the middle, and fragmented coal at the bottom. 3） The middle coal reservoir had the highest proportion of micropores and the strongest adsorption capacity. The Langmuir volume of maximum adsorption followed the trend: middle stratification（16.55 cm³/g） > lower stratification（14.69 cm³/g） > upper stratification（13.96 cm³/g）. 4） The No. 11 coal seam in the study area formed a lithology-fault-hydraulic seal gas reservoir. Based on the stratified characteristics of the coal structure, three different development technology routes were compared, and the most applicable direction for CBM development was identified as constructing cavities in the soft stratification of tectonic coal using horizontal wells to achieve pressure relief and CBM extraction.

Key words: tectonic coal stratification, coalbed methane, thick coal seam, reservoir characteristics, exploration and development direction

CLC Number:

TE37

QIU Wenci,SANG Shuxun,GUO Zhijun, et al. Characteristics of stratified coal reservoirs in Liupanshui coalfield of Guizhou Province and exploration and development direction of coalbed methane[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(6): 959-966.

Figures/Tables 12

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References 28

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煤层编号	工业组分				显微组分				最大镜质组反射率
煤层编号	水分	灰分	挥发分	固定碳	镜质组	壳质组	惰质组	有机总量	最大镜质组反射率
上层	0.57	18.16	21.82	60.02	42.4	1.2	27.4	71.0	1.01
中层	1.19	12.14	18.47	71.63	53.1	0.6	24.5	78.2	1.04
下层	1.04	16.49	26.78	61.15	40.8	0.6	25.3	66.7	1.01

煤层层位	高压压汞			低温液氮吸附		低温CO₂吸附
煤层层位	孔体积/（cm³/g）	孔比表面积/（m²/g）	中孔隙度/%	BJH孔体积/ （cm³/g）	BJH孔比表面积/（m²/g）	DFT孔体积（cm³/g）
上分层	0.034	0.08	4.461 8	0.001 36	0.717 29	0.035
中分层	0.080	0.25	9.286 9	0.002 98	1.348 50	0.047
下分层	0.040	0.16	4.598 8	0.002 35	1.495 30	0.043

煤体层位	拟合精度	兰氏体积/（cm³/g）	兰氏压力/MPa
上分层煤	0.997 0	13.96	2.02
中分层煤	0.999 9	16.55	3.66
下分层煤	0.997 4	14.69	2.60

Characteristics of stratified coal reservoirs in Liupanshui coalfield of Guizhou Province and exploration and development direction of coalbed methane

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