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

Abstract

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

CLC Number:

TE37

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.

Figures/Tables 9

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References 31

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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

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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