基于地层水指标的页岩气保存条件评价——以渝东南地区五峰组—龙马溪组页岩气藏为例

doi:10.13809/j.cnki.cn32-1825/te.2021.01.007

油气藏评价与开发 ›› 2021, Vol. 11 ›› Issue (1): 47-55.doi: 10.13809/j.cnki.cn32-1825/te.2021.01.007

基于地层水指标的页岩气保存条件评价——以渝东南地区五峰组—龙马溪组页岩气藏为例

张光荣^1,²(),聂海宽^3,⁴(),唐玄^1,²,张培先⁵,彭勇民^3,⁴

1.中国地质大学（北京）, 北京 100083
2.自然资源部页岩气资源战略评价重点实验室,北京 100083
3.页岩油气富集机理与有效开发国家重点实验室,北京 100083
4.中国石化石油勘探开发研究院, 北京 100083
5.中国石化华东油气分公司勘探开发研究院, 江苏南京 210011

收稿日期:2020-06-28 发布日期:2021-02-04 出版日期:2021-02-26
通讯作者: 聂海宽 E-mail:2106180043@cugb.edu.cn;niehk.syky@sinopec.com
作者简介:张光荣（1996—）, 男, 在读硕士研究生, 主要从事非常规油气地质研究。地址：北京市海淀区学院路29号，邮政编码：100083。E-mail：2106180043@cugb.edu.cn
基金资助:
国家自然科学基金“四川盆地五峰组—龙马溪组页岩气储层演化机理及评价方法”(41872124);国家自然科学基金“四川盆地及周缘龙潭组海陆过渡相页岩复杂有机质孔隙发育机制”(41972132);国家自然科学基金“中国南方寒武系页岩有机质、流体和孔隙演化耦合机制研究”(41730421)

Evaluation of shale gas preservation conditions based on formation water index: A case study of Wufeng-Longmaxi Formation in Southeastern Chongqing

Zhang Guangrong^1,²(),Nie Haikuan^3,⁴(),Tang Xuan^1,²,Zhang Peixian⁵,Peng Yongmin^3,⁴

1. China University of Geosciences（Beijing）, Beijing 100083, China
2. Key Laboratory of Strategy Evaluation for Shale Gas, Ministry of Natural Resources of the People's Republic of China, Beijing 100083, China
3. Shale Oil and Gas Enrichment Mechanism and Effective Development of State Key Laboratory, Beijing 100083, China
4. Sinopec Petroleum Exploration and Production Research Institute, Beijing 100083, China
5. Research Institute of Exploration & Development, Sinopec East China Oil and Gas Company, Nanjing, Jiangsu 210011, China

Received:2020-06-28 Online:2021-02-04 Published:2021-02-26
Contact: Nie Haikuan E-mail:2106180043@cugb.edu.cn;niehk.syky@sinopec.com

摘要/Abstract

摘要：

四川盆地及其周缘五峰组—龙马溪组页岩气勘探开发已取得较好成果,但不同井位之间页岩含气量差异大。通过对渝东南地区PY1HF、JY1HF、NY1HF、LY1等井位地层水的矿化度、地化指标、水型等分析后认为：CaCl₂水型反映较好的页岩气保存条件,NaHCO₃和Na₂SO₄水型反映地层水与大气水有不同程度的贯通,保存条件相对较差。基于渝东南地区发育的大型断裂和残留向斜构造及五峰组—龙马溪组地层水特征,将其地下水渗流方式对应划分为大型断裂发育区地层水下渗型和残留向斜区地层水向心流型两种类型,分别对应不同的页岩气保存条件。大型断裂发育的地区,地表水沿断裂下渗深度较大,对页岩气藏破坏较大,多表现为微含气或不含气状态;残留向斜区地层水向心流型,向斜深部保存条件相对较好。在向斜边缘地表水与地层水形成自由交替带,页岩气藏的保存条件较差,因而含气性较差,而越靠近核部地区受大气水下渗影响越弱,保存条件越好。

关键词: 渝东南, 地层水, 页岩气, 保存条件, 矿化度, 化学指标

Abstract:

Significant progress has been made in the exploration and development of shale gas in the Wufeng-Longmaxi Formation of Sichuan Basin, but shale gas content varies greatly among different well locations. Through the analysis of formation water salinity, geochemical index and formation water type in Well-PY1HF, Well-JY1HF, Well-NY1HF, Well-LY1 and other wells in Southeastern Chongqing, it is found that CaCl₂ water type reflects good shale gas preservation conditions, while the water types of NaHCO₃ and Na₂SO₄ reflect formation water and atmospheric water are interconnected to different extent, leading to a relatively poor preservation condition. Based on the characteristics of large-scale faults and residual syncline structures developing in Southeastern Chongqing and the formation water characteristics of Wufeng-Longmaxi Formation, the groundwater seepage mode can be divided into two types: the infiltration type in the large-scale fault development area and the centripetal flow type in the residual syncline area, corresponding to different shale gas preservation conditions. In the area with large-scale faults, the surface water infiltrates deeply along the faults, causing great damage to shale gas reservoir, most of them contain few gases. The formation water in the residual syncline is centripetal flow, and the deep part of the syncline is relatively well preserved. The surface water and the formation water form a free alternating zone at the syncline edge, and the preservation condition of shale gas reservoir is poor, thus the gas bearing property is poor. In the core part of the syncline, the closer to the core part, the weaker the influence of atmospheric water infiltration is, and the better the preservation condition will be.

Key words: Southeastern Chongqing, formation water, shale gas, preservation condition, salinity, chemical index

中图分类号:

TE37

张光荣,聂海宽,唐玄等. 基于地层水指标的页岩气保存条件评价——以渝东南地区五峰组—龙马溪组页岩气藏为例[J]. 油气藏评价与开发, 2021, 11(1): 47-55.

Guangrong Zhang,Haikuan Nie,Xuan Tang, et al. Evaluation of shale gas preservation conditions based on formation water index: A case study of Wufeng-Longmaxi Formation in Southeastern Chongqing[J]. Reservoir Evaluation and Development, 2021, 11(1): 47-55.

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井位	深度（m）	采样时间（d）
PY1HF	2 136~2 159	47~1 245
PY2HF	2 233~2 260	4~157
PY3HF	2 753~2 780	192~1 005
PY4HF	1 899~1 915	10~269
LY1	2 818~2 824	124~133
NY1HF	4 399~4 406	165~497
JY1HF	2 408~2 419	96~218
JY1-3HF	2 409~2 417	0~45

PY2HF井压裂液	K⁺+Na⁺	Ca²⁺	Mg²⁺	Cl^-	SO₄^2-	HCO₃^-	总矿化度
滑溜水+线性胶混合液	0.482	0.107		0.171	0.290	0.403	1.40
线性胶	0.571	0.070		0.231	0.216	1.394	2.40
滑溜水	1.511	0.097		2.246	0.260	0.279	4.30
PY2HF井	8.546	0.392	0.048	15.095	0.040	0.549	24.64

井位		离子含量（g/L）						总矿化度（g/L）	埋深（m）
井位		K⁺+Na⁺	Ca²⁺	Mg²⁺	Cl^-	SO₄^2-	HCO₃^-	总矿化度（g/L）	埋深（m）
PY1HF	范围值	10.884~22.510	0.585~1.053	0.046~0.157	17.219~36.470	0.041~0.566	0.186~0.623	29.8~54.6	2 136~2 159
PY1HF	平均值	14.851	0.776	0.076	27.705	0.234	0.376	43.98
PY2HF	范围值	4.674~12.992	0.310~0.613	0.032~0.054	9.359~25.294	0.005~0.070	0.310~0.650	15.0~39.2	2 233~2 260
PY2HF	平均值	8.546	0.392	0.048	15.095	0.040	0.549	24.64
PY3HF	范围值	13.120~21.380	0.078~0.991	0.012~0.117	24.066~39.298	0.032~0.165	0.310~0.652	38.0~59.3	2 753~2 780
PY3HF	平均值	16.085	0.830	0.072	31.102	0.104	0.376	48.58
PY4HF	范围值	4.989~13.273	0.299~0.761	0.005~0.095	8.895~27.881	0.036~0.114	0.124~0.898	15.1~42.1	1 899~1 915
PY4HF	平均值	11.354	0.600	0.071	23.928	0.068	0.289	36.28
LY1	范围值	11.516~11.770	0.245~0.269	0.038~0.105	11.174~11.528	8.991~9.117	0.888~0.941	32.9~33.5	2 818~2 824
LY1	平均值	11.618	0.257	0.065	11.344	9.052	0.900	33.25
NY1HF	范围值	7.759~10.819	0.147~1.634	0.004~0.029	13.423~25.295	0.004~0.138	0.279~1.582	23.5~38.3	4 399~4 406
NY1HF	平均值	9.160	0.327	0.017	17.050	0.051	0.647	27.26
JY1HF	范围值	1.384~14.200	0.049~0.373	0.022~0.081	1.926~21.509	0.021~0.360	1.448~1.550	4.1~37.9	2 408~2 419
JY1HF	平均值	6.515	0.174	0.043	9.542	0.229	1.316	17.75
JY1-3HF	范围值	1.372~5.877	0.162~0.249	0.095~0.113	1.385~8.666	0.123~0.823	1.491~1.538	5.4~16.4	2 409~2 417
JY1-3HF	平均值	3.625	0.205	0.104	5.026	0.473	1.514	10.90

井号		变质系数	钠氯系数	钙镁系数	脱硫系数	碳酸盐平衡系数	水型	埋深（m）
PY1HF	范围值	54.04~411.72	0.41~0.72	6.24~17.19	0.11~3.29	0.19~1.07	CaCl₂	2 136~2 159
PY1HF	平均值	204.76	0.54	11.63	1.17	0.56
PY2HF	范围值	65.95~238.04	0.48~0.70	6.60~12.90	0.03~0.42	0.59~1.91	CaCl₂	2 233~2 260
PY2HF	平均值	141.42	0.56	8.33	0.26	1.52
PY3HF	范围值	84.43~961.09	0.45~0.68	6.60~32.50	0.13~0.45		CaCl₂	2 753~2 780
PY3HF	平均值	315.75	0.51	13.21	0.33
PY4HF	范围值	146.87~1 209.20	0.46~0.54	6.10~65.04	0.16~1.27		CaCl₂	1 899~1 915
PY4HF	平均值	279.33	0.47	14.26	0.32
LY1	范围值		1.02~1.03	2.38~6.85	77.99~81.36	3.30~3.69	Na₂SO₄	2 818~2 824
LY1	平均值		1.024	4.35	79.81	3.51
NY1HF	范围值	267.47~856.79	0.40~0.69	9.74~67.98	0.03~1.06	0.26~5.95	CaCl₂	4 399~4 406
NY1HF	平均值	493.20	0.51	19.83	0.39	2.60
JY1HF	范围值	6.04~712.45	0.02~0.90	1.98~12.37	1.07~14.40	1.21~29.39	CaCl₂	2 408~2 419
JY1HF	平均值	206.54	0.59	4.46	6.29	10.47
JY1-3HF	范围值	12.23~91.12		1.70~2.20	1.40~37.28	6.18~9.21	NaHCO₃	2 409~2 417
JY1-3HF	平均值	51.67		1.95	19.34	7.70

基于地层水指标的页岩气保存条件评价——以渝东南地区五峰组—龙马溪组页岩气藏为例

Evaluation of shale gas preservation conditions based on formation water index: A case study of Wufeng-Longmaxi Formation in Southeastern Chongqing

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