川南深层页岩气超临界吸附解吸附特征研究

doi:10.13809/j.cnki.cn32-1825/te.2021.02.006

摘要/Abstract

摘要：

页岩气吸附量主要受埋深、矿物成分、温度、压力等因素的影响,川南页岩气具有埋深大、高温、高压的特点,明确这类页岩储层超临界状态的吸附解吸附特征对于落实气藏储产量意义重大。综合采用室内物理模拟实验和分子动力学模拟相结合的方法,构建并优选了伊利石+干酪根复合表征模型,拓展建立了川南深层页岩气全域吸附量多元预测模型,明确了气藏的吸附解吸附特征。实验分析结果表明：随着地层压力的增加,吸附量逐渐增加,压力高于15 MPa后吸附量增幅逐步变缓;气藏原始条件下吸附气量占总气量体积的20 %~25 %;地层压力降至20 MPa时自由气采出程度约70 %~90 %,吸附气采出程度约25 %~40 %。

关键词: 川南深层页岩气, 高温, 高压, 吸附, 解吸附, 预测模型, 采出程度

Abstract:

The adsorption capacity of shale gas is mainly influenced by the factors such as burial depth, mineral composition, temperature and pressure. The shale gas in South Sichuan has the characteristics of large buried depth, high temperature and high pressure. It has great significance to determine the adsorption and desorption characteristics of this kind of shale reservoir in supercritical state for the implementation of gas reservoir production. By the combination of indoor physical simulation experiments and molecular dynamics simulation, the composite characterization model of Illite and Kerogen is constructed and optimized, the multiple prediction model of whole area adsorption capacity of the deep shale gas in South Sichuan is developed, and the adsorption and desorption characteristics of the gas reservoir are clarified. The experimental results show that: with the increase of formation pressure, the adsorption capacity increases gradually, and when the pressure is higher than 15 MPa, the increase of adsorption capacity gradually slows down. Under the original conditions of gas reservoir, the adsorbed gas volume accounts for 20 % ~ 25 % of the total gas volume. When the formation pressure drops to 20 MPa, the recovery degree of free gas is about 70 % ~ 90 %, and the recovery degree of adsorbed gas is about 25 % ~ 40 %.

Key words: deep shale gas in South Sichuan, high temperature, high pressure, adsorption, desorption, prediction model, recovery degree

中图分类号:

TE312

杨建,詹国卫,赵勇等. 川南深层页岩气超临界吸附解吸附特征研究[J]. 油气藏评价与开发, 2021, 11(2): 184-189.

Jian YANG,Guowei ZHAN,Yong ZHAO, et al. Characteristics of supercritical adsorption and desorption of deep shale gas in South Sichuan[J]. Reservoir Evaluation and Development, 2021, 11(2): 184-189.

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样品编号	层位	深度（m）	TOC（%）	干酪根类型	R_o （%）	黏土矿物（%）	石英（%）
W1	五峰组—龙马溪组一段	3 850.84	2.97	Ⅰ	2.07	37.5	33.65
W2		3 689.37	2.99	Ⅰ	2.30	32.3	42.10
Y1		3 988.15	2.55	Ⅰ、Ⅱ₁	2.35	41.0	46.70

样品编号	层位	压力（MPa）	校正孔隙度	校正含气饱和度	吸附气储存能力（m³/kg）	自由气储存能力（m³/kg）	吸附气体积比例（%）	含气量（m³/t）
W1	五峰组—龙马溪组一段	76.7	0.042 0	0.56	0.003 49	0.003 22	21.3	3.41
W2		75.0	0.056 0	0.56	0.002 93	0.002 80	19.5	3.16
Y1		63.3	0.039 9	0.60	0.002 23	0.001 79	24.7	2.85

地层压力（MPa）	采出程度（%）			占总气量的比例（%）
地层压力（MPa）	吸附气	自由气	总气量	自由气	吸附气
75	0.74	2.89	1.68	92.65	7.35
70	1.14	14.10	7.48	92.16	7.84
60	3.25	33.06	17.84	89.96	10.04
50	6.04	51.44	28.26	87.41	12.59
40	9.96	67.97	38.34	82.87	17.13
30	15.78	81.27	47.83	75.39	24.61
20	25.44	88.11	56.11	62.80	37.20

地层压力（MPa）	采出程度（%）			占总气量比例（%）
地层压力（MPa）	吸附气	自由气	总气量	自由气	吸附气
60	1.57	7.72	4.31	80.57	19.43
50	6.61	27.38	15.87	76.66	23.34
40	13.27	46.10	27.90	71.15	28.85
30	22.48	61.90	40.05	63.68	36.32
20	36.05	71.85	52.01	53.89	46.11