四川盆地南川地区及邻区页岩气保存差异的流体响应特征

doi:10.13809/j.cnki.cn32-1825/te.2023.04.006

摘要/Abstract

摘要：

四川盆地南川地区及邻区上奥陶统五峰组—下志留统龙马溪组页岩气勘探开发已取得丰硕成果，但如何利用流体特征综合分析各区块页岩气保存差异值得关注。研究表明：①随着开采时间延长，产出水矿化度逐渐升高，且明显不同于压裂液，表明页岩层内存在可动地层水，其矿化度超过50 g/L，CaCl₂水型；②富集高产井低产水，矿化度低，NaHCO₃水型，具有凝析水特征；③不同保存条件下，产出水氘、氧同位素特征随时间而有不同变化，盆内高压稳定区块，逐步偏离大气降水线，盆外常（低）压复杂区块，一直靠近大气降水线；④从盆内到盆外，由深至浅，页岩裂缝充填方解石脉流体包裹体的均一温度逐渐降低（从240 ℃至90 ℃），包裹体盐水的变质系数也逐渐变大，反映了页岩气保存条件的差异破坏程度。

关键词: 页岩气, 保存条件, 水化学特征, 同位素, 南川

Abstract:

The exploration and development of shale gas in Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation in Nanchuan and its adjacent blocks have yielded fruitful results. However, it is crucial to pay closer attention to the comprehensive use of fluid characteristics for analyzing the differences in shale gas preservation conditions in each block. Research findings reveal the following key points: ① With the prolongation of recovery time, the mineralization degree of the produced water gradually increases, exhibiting notable differences from fracturing fluid. This suggests the presence of the presence of movable CaCl₂-rich formation water in shale layer, characterized by a mineralization degree exceeding 50 g/L; ② Enriched and high-yield wells exhibit low water production, low mineralization and rich in NaHCO₃, which are indicative of condensate water; ③ Under different preservation conditions, the deuterium oxygen isotopes of the produced water vary with time. The high pressure stable block in the basin gradually deviates from the atmospheric precipitation line, while the normal（low） pressure complex block outside the basin remains close to the atmospheric precipitation line; ④ From the inside to the outside of the basin and from deep to shallow, the homogenization temperature of fluid inclusions in shale fracture filled calcite veins gradually decreases（from 240 ℃ to 90 ℃）. Simultaneously, the metamorphism coefficient of the inclusions also gradually increases, reflecting the degree of differential damage of shale gas preservation conditions.

Key words: shale gas, preservation condition, hydrochemical characteristics, isotope, Nanchuan

中图分类号:

TE37

楼章华, 张欣柯, 吴宇辰, 高玉巧, 张培先, 金爱民, 朱蓉. 四川盆地南川地区及邻区页岩气保存差异的流体响应特征[J]. 油气藏评价与开发, 2023, 13(4): 451-458.

LOU Zhanghua, ZHANG Xinke, WU Yuchen, GAO Yuqiao, ZHANG Peixian, JIN Aimin, ZHU Rong. Fluid response characteristics of shale gas preservation differences in Nanchuan and its adjacent blocks in Sichuan Basin[J]. Petroleum Reservoir Evaluation and Development, 2023, 13(4): 451-458.

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构造	井号	日产气量/m³	日产液量/m³	返排率/ %	生产天数/ d	矿化度/ （mg/L）	压力系数	测试产气量/ （10⁴m³/d）
平桥背斜南主体	焦页195-3HF	91 634.60	4.67	21.27	1 364	21 904.22	1.32	31.70
	焦页200-1HF	68 302.99	2.83	12.77	1 438	20 360.20	1.31	89.50
	焦页195-1HF	59 651.44	2.17	13.71	1 492	17 257.76	1.32	22.70
	焦页194-3HF	58 414.23	1.57	9.87	1 428	18 726.96	1.32	34.30
平桥西断裂带	焦页205-1HF	19 998.40	14.77	49.21	1 069	31 851.41	1.35	10.70
平桥南斜坡	焦页10-10HF	37 466.71	10.24	33.29	872	17 842.94	1.12	9.01
平桥南斜坡	焦页10HF	35 007.39	15.44	37.98	903	25 112.94	1.18	19.60
东胜背斜	胜页9-1HF	65 430.77	11.94	34.40	512	15 651.15	1.14	10.03
东胜背斜	胜页2HF	64 987.63	14.61	28.10	874	20 231.05	1.20	32.80
武隆向斜	隆页1HF	17 335.89	4.93	31.18	2 160	40 002.21	1.08	4.60
	隆页2HF	17 059.74	6.11	38.11	1 149	35 397.58	1.06	9.20
	隆页3HF	12 223.55	107.98	19.93	88	38 865.91	1.08	7.20
桑柘坪向斜	彭页3HF	3 008.36	5.83	31.77	2 488	31 407.42	1.05	3.80

井名	送样编号	深度/ m	层位	Na⁺/ （μg/g）	K⁺/ （μg/g）	Mg²⁺/ （μg/g）	Ca²⁺/ （μg/g）	F^-/ （μg/g）	Cl^-/ （μg/g）	NO₃^-/ （μg/g）	SO₄^2-/ （μg/g）	变质系数	地层压力系数	测试产气量/（10⁴ m³/d）
焦页10-10	JY10-10-3	2 633.80	S₁l	124.0	70.40	2.000	22.1	0.332	19.60	2.240	374	9.63	1.12	9.01
	JY10-10-4	2 674.80	S₁l	134.0	143.00	11.300	153.0	1.090	15.40	2.920	841	13.24
	JY10-10-6	2 702.70	S₁l	163.0	117.00	9.160	51.3	1.280	14.70	2.490	597	16.87
胜页3	SY3-6	2 872.03	S₁l	228.0	39.50	1.590	19.2	0.550	14.90	2.720	490	23.29	1.15	7.10
	SY3-8	2 966.00	S₁l	39.4	27.20	16.200	160.0	0.489	25.90	1.690	535	2.31
	SY3-9	2 969.50	S₁l	82.6	41.50	21.700	327.0	0.774	31.00	12.800	1 077	4.05
焦页10	JY10-1	3 296.00	S₁l	87.8	82.90	4.510	84.3	0.512	20.10	3.620	436	6.65	1.18	19.60
	JY10-3	3 373.90	S₁l	98.9	79.10	18.900	85.7	0.677	24.80	3.390	499	6.07
	JY10-6	3 399.40	S₁l	6.71	4.78	0.955	13.4	0.144	5.11	0.761	861	2.00
焦页194-3	JY194-3-6	2 664.70	S₁l	20.8	20.70	1.710	33.5	0.765	24.00	0.904	84	1.32	1.32	34.30
	JY194-3-10	2 695.63	S₁l	187.0	154.00	15.500	727.0	0.722	40.10	19.100	2 389	7.10
	JY194-3-11	2 701.30	O₂b	36.0	65.60	22.000	443.0	1.280	10.80	8.650	1 317	5.07
焦页205-2	JY205-2HF-5	1 181.30	P₁m	27.7	3.86	17.600	52.0	5.240	46.50	2.540	135	0.91	1.35	10.88
	JY205-2HF-12	1 238.04	P₁m	15.9	2.54	20.200	56.1	5.350	13.30	2.280	215	1.82
	JY205-2HF-13	1 243.30	P₁m	10.7	8.73	3.280	12.0	7.090	18.40	6.020	1 033	0.88