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

油气藏评价与开发 ›› 2024, Vol. 14 ›› Issue (3): 382-390.doi: 10.13809/j.cnki.cn32-1825/te.2024.03.008

海陆过渡相页岩储层合层开采数值模拟研究

陈学忠¹(),赵慧言¹,陈满¹,徐华卿²,杨建英¹,杨晓敏¹,唐慧莹³()

1.四川长宁天然气开发有限责任公司，四川成都 610051
2.中国石油西南油气田分公司成都天然气化工总厂，四川成都 610213
3.西南石油大学油气藏地质及开发工程全国重点实验室，四川成都 610500

收稿日期:2023-08-29 发布日期:2024-07-10 出版日期:2024-06-26
通讯作者: 唐慧莹（1990—），女，博士，副教授，主要从事非常规储层压裂及一体化数值模拟研究。地址：四川省成都市新都区新都大道8号西南石油大学，邮政编码：610500。E-mail: tanghuiying@swpu.edu.cn
作者简介:陈学忠（1968—），男，硕士，高级工程师，主要从事油气田开发管理工作。地址：四川省成都市成华区猛追湾横街99号，邮政编码：610051。E-mail: cxzhong@petrochina.com.cn
基金资助:
国家自然科学基金面上项目“井-射孔-缝协同密切割压裂三维非平面缝网竞争扩展机制研究”(52374043)

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

CHEN Xuezhong¹(),ZHAO Huiyan¹,CHEN Man¹,XU Huaqing²,YANG Jianying¹,YANG Xiaomin¹,TANG Huiying³()

1. Sichuan Changning Natural Gas Development Co. Ltd., Chengdu, Sichuan 610051, China
2. Chengdu Natural Gas Chemical Plant of PetroChina Southwest Oil and Gas Field Company, Chengdu, Sichuan 610213, China
3. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China

Received:2023-08-29 Online:2024-07-10 Published:2024-06-26

摘要/Abstract

摘要：

由于沉积环境的不同，海陆过渡相页岩与海相页岩存在较大差异。基于鄂尔多斯盆地东缘海陆过渡相页岩储层的特点，建立了纵向多岩性叠置储层水平井产能数值模型，分析了不同岩性组合模式下的气井单段生产动态特征，研究了煤层渗透率、储层叠置关系等关键参数以及生产制度对生产特征的影响。研究结果表明：①富煤型页岩储层合层开采初期气水同产，采出气主要来自砂岩和页岩储层的游离气，采出水主要来自压裂液及煤层水。煤层的渗透率越高，合层开采的累计产气量越大，累计产水量也随之提升。②含煤叠置组合类型进行合层开采最理想的空间叠置顺序为页—砂—煤，在该叠置顺序下，煤层产水对合层开采干扰最小。③煤层产气量受应力敏感的影响最大。

关键词: 海陆过渡相, 页岩, 合层开采, 数值模拟, 叠置关系

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

中图分类号:

TE121.1

陈学忠,赵慧言,陈满等. 海陆过渡相页岩储层合层开采数值模拟研究[J]. 油气藏评价与开发, 2024, 14(3): 382-390.

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

图/表 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

海陆过渡相页岩储层合层开采数值模拟研究

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

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参考文献 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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