上扬子地区断裂活动对页岩气保存的破坏作用

余光春; 魏祥峰; 李飞; 刘珠江

doi:10.11781/sysydz202003355

上扬子地区断裂活动对页岩气保存的破坏作用

doi: 10.11781/sysydz202003355

中国石油化工股份有限公司勘探分公司, 成都 610041

基金项目:

国家科技重大专项“重点地区页岩气富集规律与勘探评价方法” 2017ZX05036-001

详细信息

作者简介:
余光春(1983—)，男，硕士，副研究员，从事非常规油气地质研究。E-mail: yugc.ktnf@sinopec.com

中图分类号: TE132.2
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- 被引次数: 0
出版历程
- 收稿日期: 2019-12-30
- 修回日期: 2020-04-02
- 刊出日期: 2020-05-28

Disruptive effects of faulting on shale gas preservation in Upper Yangtze region

SINOPEC Exploration Company, Chengdu, Sichuan 610041, China

摘要

摘要: 以四川盆地及周缘下古生界海相页岩层系断裂活动为研究对象，通过地震综合解释及对页岩层系裂缝方解石脉中流体包裹体的分析测试，结合不同含气性典型页岩气钻井解剖，开展了断裂活动对页岩气后期保存破坏作用的研究。断裂的级别及空间叠置方式、断裂活动的期次及其持续性对页岩气的保存条件具有重要的影响：①断裂级别越高其影响范围越大，距离一级断裂约10 km以内，保存条件破坏较大；距离二级断裂5 km以内，页岩含气性受影响明显；距离三级断裂2~3 km以内受一定影响；四级断裂影响不明显；②在井区断裂密度相似的前提下，不同级别的断裂从平行到小角度相交再到大角度相交，对页岩气保存的破坏作用逐渐增强；③断裂活动期次越多、持续时间越长对页岩气后期保存的破坏作用越强。根据断裂期次及活动持续性，可划分为4种类型：①晚燕山期短期活动，保存条件影响较小；②燕山期-早喜马拉雅期断续活动，保存条件受一定影响；③晚燕山期以来持续活动，保存条件破坏严重；④喜马拉雅期以来持续活动，保存条件影响较大。
- 流体包裹体 /
- 断裂活动 /
- 断裂级别 /
- 保存条件 /
- 页岩气 /
- 四川盆地
Abstract: The fracturing of the Paleozoic marine shale in the Sichuan Basin and its periphery was studied. The disruptive effects of faulting on shale gas preservation were analyzed based on the comprehensive interpretation of seismic structure, the analysis of fluid inclusions in calcite veins in fractures in shale layers, and the consideration of typical shale gas wells with different gas-bearing properties. Fault level, spatial stacking pattern, stage and duration have an important influence on the preservation conditions of shale gas. (1) The higher the fault level is, the larger the impact. The preservation conditions for shale gas are destroyed in the areas close to the first-level faults (within about 10 km), the second-level faults (within about 5 km), and the third-level faults (within about 2-3 km), but not influenced in the area close to the fourth-level faults. (2) Under the premise of similar fracture density in the well area, when different levels of faults intersect from parallel or small angles to large angles, the damage to shale gas preservation gradually increases. (3) The more fault activity periods and the longer their duration, the greater is the damage to shale gas preservation in the later period. Fault period and activity duration can be divided into 4 types: (1) short-term activity in the late Yanshan period, whose impact on preservation conditions was small; (2) intermittent activity in the Yanshan and early Himalayan periods where preservation conditions were affected to some extent; (3) continuous activity since the late Yanshan period, which caused serious damage to preservation conditions; and (4) continuous activity since the Himalayan period, which had a greater impact on preservation conditions.
- fluid inclusions /
- fault activity /
- fault grade /
- preservation conditions /
- shale gas /
- Sichuan Basin

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图 1 川东南焦石坝地区断裂分布

Figure 1. Fault distribution in the Jiaoshiba area, southeastern Sichuan Basin

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图 2 川西南地区志留系断裂分布

Figure 2. Fault distribution in Silurian, southwestern Sichuan Basin

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图 3 川东南丁山地区DY2井龙马溪组埋藏史(a)及流体包裹体均一温度分布(b)

Figure 3. Burial history (a) and homogenization temperature of fluid inclusions (b) in Longmaxi Formation, well DY2, Dingshan area, southeastern Sichuan Basin

下载: 全尺寸图片幻灯片

图 4 川东南焦石坝地区JY2井龙马溪组埋藏史(a)及流体包裹体均一温度分布(b)

Figure 4. Burial history (a) and homogenization temperature of fluid inclusions (b) in Longmaxi Formation, well JY2, Jiaoshiba area, southeastern Sichuan Basin

下载: 全尺寸图片幻灯片

图 5 川东南焦石坝地区JY5井龙马溪组埋藏史(a)及流体包裹体均一温度分布(b)

Figure 5. Burial history (a) and homogenization temperature of fluid inclusions (b) in Longmaxi Formation, well JY5, Jiaoshiba area, southeastern Sichuan Basin

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图 6 川东南南天湖地区TY1井龙马溪组埋藏史(a)及流体包裹体均一温度分布(b)

Figure 6. Burial history (a) and homogenization temperature of fluid inclusions (b) in Longmaxi Formation, well TY1, Nantianhu area, southeastern Sichuan Basin

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图 7 川东南丁山地区DY1井龙马溪组埋藏史(a)及流体包裹体均一温度分布(b)

Figure 7. Burial history (a) and homogenization temperature of fluid inclusions (b) in Longmaxi Formation, well DY1, Dingshan area, southeastern Sichuan Basin

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图 8 川西南屏边地区MY1井龙马溪组埋藏史(a)及流体包裹体均一温度分布(b)

Figure 8. Burial history (a) and homogenization temperature of fluid inclusions (b) in Longmaxi Formation, well MY1, Pingbian area, southeastern Sichuan Basin

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表 1 四川盆地及周缘五峰组—龙马溪组重点页岩气钻井井区断裂统计

Table 1. Fault features of key shale gas wells in Wufeng-Longmaxi formations, Sichuan Basin and its periphery

构造位置	井号	埋深/m	距一级断裂/km	距二级断裂/km	距三级断裂/km	距四级断裂/km	不同级别断裂叠置方式	压力系数	产量/(10⁴m³·d^-1)
南天湖斜坡	TY1井	3 940	10.7	2~3	0~2.30		二、三级与一级断裂45°相交	<0.80	微气
丁山断背斜及斜坡	DY1井	2 050	5.6			0.90	四级与一级断裂平行不相交	0.98	3.40
	DY3井	2 270	8.4			0.70	四级与一级断裂小角度不相交	1.08	3.36
	DY4井	3 730	9.5		1.65	1.40	三级与二级断裂垂直不相交，三四级断裂垂直相交	1.45	20.56
	DY5井	3 810	15.5			1.15	四级与一级断裂大角度不相交	1.55	16.33
	DY2井	4 360	17.6			0.10	四级与一级断裂大角度不相交	1.82	10.50
焦石坝箱状背斜	JY1井	2 400		5.8	1.90		三级与二级断裂小角度不相交	1.55	20.30
焦石坝箱状背斜	JY3井	2 450		4.3	2.10	1.50	四级平行三级断裂，三级断裂与二级断裂小角度相交	1.25	11.55
鸭江断鼻	JY5井	3 080		1.2~5.5		1.70	四级与二级断裂小角度不相交，两组二级断裂相交	0.99	4.50
白马向斜	JY6井	3 270		4.8~7.4	0.70	0.70	四级与三级断裂平行，两组二级断裂小角度相交	1.19	6.68
白马向斜	JY7井	3 570	7.3	4.6~5.7	3.70	1.20	各级断裂平行不相交	1.39	3.68
平桥断背斜	JY8井	2 820			1.40~2.00	1.00~1.40	三四级断裂平行不相交	1.56	20.90
屏边断背斜	MY1井	3 100		13.8	0.80	2.40	三四级与二级断裂近垂直相交	<0.80	微气
永福断鼻	YF1井	2 840			1.80	3.90	三四级断裂大角度不相交		含气量2.14 m³/t
仁怀斜坡	RY1井	4 100	12.0		6.00	1.50~2.40	各级断裂平行不相交	<0.80	微气

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