海陆过渡相页岩储层合层开采数值模拟研究

doi:10.13809/j.cnki.cn32-1825/te.2024.03.008

Abstract

Abstract:

Distinct sedimentary environments lead to notable disparities between marine-continental transitional shale and purely marine shale. This study develops a numerical model to evaluate the productivity of horizontal wells in vertically multi-lithologic superimposed reservoirs, focusing on the marine-continental transitional shale reservoirs at the eastern margin of the Ordos Basin. The model analyses the dynamic characteristics of single-stage gas well production under various lithologic combination modes. It particularly investigates key parameters such as coal seam permeability, the superposition relationships of reservoirs, and the impact of the production system on output characteristics. The findings indicate that: ① In the early stages of combined extraction from coal-rich shale reservoirs, both gas and water are produced simultaneously. The gas primarily originates from the free gas in the sandstone and shale reservoirs, while the water is predominantly sourced from fracturing fluid and coal seam water. Notably, higher coal seam permeability correlates with increased cumulative gas and water production. ② The optimal spatial stacking sequence for combined layer mining in coal-bearing superimposed reservoirs is identified as page-sand-coal. This sequence minimizes the interference of coal seam water production on the overall mining process. ③ The production from coal seams exhibits significant stress sensitivity, impacting overall gas output.

Key words: marine-continental transitional facies, shale, multi-layer co-production, numerical simulation, superimposition relation

CLC Number:

TE121.1

CHEN Xuezhong, ZHAO Huiyan, CHEN Man, XU Huaqing, YANG Jianying, YANG Xiaomin, TANG Huiying. Numerical simulation of multi-layer co-production in marine-continental transitional shale reservoirs[J].Petroleum Reservoir Evaluation and Development, 2024, 14(3): 382-390.

Figures/Tables 15

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数值模型参数	煤层	页岩层	致密砂岩层
网格尺寸/m	5×1×1	5×1×1	5×1×1
模型尺寸/m	600×180×3	600×180×9	600×180×3
储层厚度/m	3	9	3
基质孔隙度/%	6	3	4
天然裂缝孔隙度/%	1	1
基质渗透率/10^-3μm²	0.1	0.001	0.01
天然裂缝渗透率/10^-3μm²	1	0.01
兰氏体积/（m³/t）	13.98	2.35
兰氏压力/MPa	2.3	3.6
基质初始含水饱和度/%	0	0	40
天然裂缝初始含水饱和度/%	100	30
水力裂缝开度/m	0.01	0.01	0.01
水力裂缝渗透率/μm²	1	1	1
等效水力裂缝开度/m	1	1	1
等效水力裂缝渗透率/μm²	0.01	0.01	0.01
等效水力裂缝孔隙度	0.01	0.01	0.01

阶段	累计产气量/10⁴m³	占总累计产气量比例/%	累计产水量/m³	占总累计产水量比例/%
第一阶段	50.28	38.28	146.31	50.41
第二阶段	81.08	61.72	143.91	49.59

日产气量/ m³	无应力敏感下储层累计产气量/10⁴m³	应力敏感下储层累计产气量/10⁴m³	累计产气量下降值/ 10⁴m³	累计产气量下降率/ %
3 000	119.14	107.31	11.84	9.94
4 000	123.40	109.93	13.47	10.92
5 000	125.19	111.07	14.12	11.28
6 000	126.15	111.68	14.47	11.47
7 000	126.66	112.04	14.62	11.54
8 000	126.97	112.26	14.71	11.59
9 000	127.24	112.44	14.80	11.63

日产气量/ m³	无应力敏感下储层累计产气量/ 10⁴m³	应力敏感下储层累计产气量/ 10⁴m³	累计产气量下降值/ 10⁴m³	累计产气量下降率/ %
3 000	8.14	5.58	2.55	31.37
4 000	9.12	6.04	3.08	33.75
5 000	9.55	6.25	3.30	34.57
6 000	9.78	6.36	3.42	34.97
7 000	9.91	6.43	3.48	35.12
8 000	9.99	6.47	3.51	35.19
9 000	10.05	6.50	3.55	35.28

日产气量/ m³	无应力敏感下储层累计产气量/10⁴m³	应力敏感下储层累计产气量/10⁴m³	累计产气量下降值/ 10⁴m³	累计产气量下降率/ %
3 000	14.98	14.65	0.32	2.16
4 000	15.22	14.80	0.43	2.82
5 000	15.35	14.87	0.48	3.15
6 000	15.42	14.91	0.51	3.33
7 000	15.46	14.93	0.53	3.44
8 000	15.49	14.95	0.54	3.51
9 000	15.51	14.96	0.55	3.56

Numerical simulation of multi-layer co-production in marine-continental transitional shale reservoirs

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References 27

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日产气量/ m³	无应力敏感下储层累计产气量/10⁴m³	应力敏感下储层累计产气量/10⁴m³	累计产气量下降值/ 10⁴m³	累计产气量下降率/ %
3 000	95.64	86.68	8.96	9.37
4 000	98.67	88.71	9.97	10.10
5 000	99.91	89.57	10.34	10.35
6 000	100.56	90.02	10.54	10.48
7 000	100.90	90.29	10.61	10.51
8 000	101.11	90.46	10.65	10.54
9 000	101.30	90.59	10.71	10.57

日产气量/ m³	无应力敏感下储层累计产水量/m³	应力敏感下储层累计产水量/ m³	累计产水量下降值/ m³	累计产水量下降率/ %
3 000	277.65	209.67	67.97	24.48
4 000	283.30	207.28	76.03	26.84
5 000	285.71	205.06	80.66	28.23
6 000	286.99	203.32	83.67	29.15
7 000	287.63	201.83	85.80	29.83
8 000	287.97	200.62	87.34	30.33
9 000	288.33	199.60	88.73	30.77

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