四川盆地外围常压页岩气勘探开发进展与攻关方向

郭彤楼; 蒋恕; 张培先; 曾萍

doi:10.11781/sysydz202005837

四川盆地外围常压页岩气勘探开发进展与攻关方向

doi: 10.11781/sysydz202005837

1.
中国石化西南油气分公司, 成都 610041
2.
中国地质大学(武汉) 构造与油气资源教育部重点实验室, 资源学院, 武汉 430074
3.
中国石化华东油气分公司, 南京 210019
4.
中国石化勘探分公司, 成都 610041

基金项目:

国家科技重大专项“彭水地区常压页岩气勘探开发示范工程” 2016ZX05061

中国石化科技项目“南川复杂构造带页岩气勘探开发关键技术研究” P19017-3

详细信息

作者简介:
郭彤楼(1965-), 男, 博士, 教授级高级工程师, 从事油气地质勘探与构造地质研究。E-mail: tlguo@163.com

中图分类号: TE132.2
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出版历程
- 收稿日期: 2020-07-20
- 修回日期: 2020-08-23
- 刊出日期: 2020-09-28

Progress and direction of exploration and development of normally-pressured shale gas from the periphery of Sichuan Basin

1.
SINOPEC Southwest Company, Chengdu, Sichuan 610041, China
2.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, School of Earth Resources, China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China
3.
SINOPEC East China Company, Nanjing, Jiangsu 210019, China
4.
SINOPEC Exploration Company, Chengdu, Sichuan 610041, China

摘要

摘要: 首先简要介绍了美国常压页岩气的基本地质情况和生产特征，以及造成页岩气常压或低压的原因，再以四川盆地外围武隆、彭水、道真等残留向斜上奥陶统五峰组—下志留统龙马溪组页岩气藏的勘探开发为例，通过对比，指出美国常压、低压页岩气藏与四川盆地外围常压页岩气的最大差别有3点：一是美国页岩气藏的厚层富有机质页岩连续分布面积大；二是绝大多数有机质热演化程度不高、吸附气含量高，多采用直井生产；三是页岩沉积后期经历的构造运动期次少、强度低。采用超轻支撑剂的氮气泡沫水平井压裂在美国Big Sandy地区Ohio低压页岩气开发中取得了成功。通过对3个残留向斜勘探开发进展的分析，提出改造期次、强度、埋深、分布面积等是盆外残留向斜保存条件差异的主要因素，也是导致地层压力系数和产量差异的主要原因；基于此，提出了下步盆地外围常压页岩气勘探开发与技术攻关建议。
- 常压页岩气 /
- 勘探开发 /
- 压裂 /
- 热演化程度 /
- 五峰组—龙马溪组 /
- 四川盆地外围
Abstract: This study firstly introduces the geology and production characteristics of the typical normally-pressured shale gas plays in the U.S. and analyzes the origins of normal pressure and under-pressure. The normally-pressured shale gas reservoirs from the periphery of Sichuan Basin are then characterized using the E & P cases of the Upper Ordovician Wufeng to Lower Silurian Longmaxi formations in the Wulong, Pengshui and Daozhen areas. The comparison between normally- and under-pressured shale gas reservoirs in the U.S. and China reveals that: (a) U.S. shales with large thickness are widely distributed; (b) U.S. shales have relatively lower maturity compared to Chinese marine shales; and (c) U.S. shales experienced fewer tectonic events after deposition. Nitrogen foam and ultra-light proppant have been successfully used for the hydraulic fracturing of the under-pressured Ohio shale in the Big Sandy area. Based on the analysis of the exploration and development progress of three residual synclines, it is apparent that the tectonic period and strength, burial depth and distribution area are the main factors for the difference of preservation conditions of residual synclines outside the basin, and are also the main reasons for the difference of formation pressure coefficient and production. Based on this, the paper puts forward some suggestions for further theoretical and technical research on normally-pressured shale gas from the periphery of the basin.
- normally-pressured shale gas /
- exploration and production /
- hydraulic fracturing /
- thermal evolution degree /
- Wufeng-Longmaxi formations /
- periphery of Sichuan Basin

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图 1 四川盆地东南缘武陵褶皱带区域地质概况

Figure 1. Geological setting of Wuling fold belt, southeastern margin of Sichuan Basin

下载: 全尺寸图片幻灯片

图 2 美国Appalachian盆地Big Sandy页岩气产区成熟度(R_o)与有机质含量(TOC)分布

数据来自文献[10, 17]。

Figure 2. Distribution of maturity (R_o) and organic matter content (TOC) in Big Sandy shale gas-producing area of Appalachian Basin, USA

下载: 全尺寸图片幻灯片

图 3 美国Appalachian盆地Big Sandy页岩气产区北东—南西向地层剖面

据参考文献[9]，井位见图 2。

Figure 3. NE-SW stratigraphic correlation in Big Sandy shale gas-producing area of Appalachian Basin, USA

下载: 全尺寸图片幻灯片

图 4 美国Appalachian盆地Big Sandy页岩气田及周边构造简图

据参考文献[20]。

Figure 4. Tectonic units in and around Big Sandy shale gas-producing area of Appalachian Basin, USA

下载: 全尺寸图片幻灯片

图 5 美国典型页岩月产量递减曲线

据参考文献[26]。

Figure 5. Decline curves of monthly production for typical shale gas plays in USA

下载: 全尺寸图片幻灯片

图 6 四川盆地东南缘过PY1、ZY1井地震剖面

测线位置见图 1。

Figure 6. Seismic profile crossing wells PY1 and ZY1, southeastern margin of Sichuan Basin

下载: 全尺寸图片幻灯片

图 7 四川盆地及周缘残留向斜地层压力系数与埋深关系

Figure 7. Relationship between formation pressure coefficient and burial depth in residual syncline in Sichuan Basin and its periphery

下载: 全尺寸图片幻灯片

表 1 美国已经开发的典型常压页岩特征数据来自参考文献[27-28]。

Table 1. Characteristics of typical normally-pressured shales developed in USA

页岩气藏	地区	地层时代	构造沉积背景	岩性	有机碳含量/%	成熟度/%	孔隙度/%	压力系数	吸附气含量占比/%	单井日产/10⁴ m³	平均直井产量/10⁴ m³	平均水平井产量/10⁸ m³
Ohio	Appalachian盆地Big Sandy地区	上泥盆统	前陆浅海陆棚	富含有机质及石英页岩夹粉砂岩	2~6	0.6~1.5	2~6	0.5~0.7	50	850~14 160	283~1 416	水平井少
Lewis	San Juan盆地	上白垩统	前陆近海	富含有机质及石英页岩夹粉砂岩	0.6~3.2	0.8~1.5	3~5	0.50~0.52	60~85	2 830~5 660	283~1 416	水平井少
Marcellus	Appalachian盆地西南	中泥盆统	前陆陆棚—斜坡	硅质—黏土页岩	2~8	1.3~3	2~7	0.7~1.2(常压区)	40	14 160~10 1940	3 964	85~113
Antrim	Michigan盆地	上泥盆统	克拉通	硅质页岩	11	0.4~0.6	9	0.7~0.8	70	1 132~14 160	2 124	水平井少
Fayetteville	Arkoma盆地	密西西比系	前陆陆棚	硅质页岩	2~10	1.5~4	4~5	0.8~1	50	14 160	566~1 699	17~57
Niobrara	Denver盆地	上白垩统	前陆陆棚	细粒白垩页岩	1.5~4	1	7~12	0.6~0.98	生物气区大于70	850~1 416
Barnett	Fort Worth盆地	密西西比系	前陆盆地	硅质页岩	2~7	1~2	4~10	1~1.2(常压区)	35	16 990~87 780	3 964	71

下载: 导出CSV

表 2 四川盆地东南缘不同区块典型井龙一段页岩评价参数对比

Table 2. Evaluation parameters of shale from first member of Longmaxi Formation in typical wells in different blocks, southeastern margin of Sichuan Basin

地区	代表井	龙一段(①—⑨小层)
地区	代表井	厚度/m	w(TOC)/%	孔隙度/%	R_o/%	石英含量/%	黏土含量/%	泊松比	杨氏模量/GPa
武隆	LY1	97	2.67	3.90	2.56	46.81	35.67	0.21	42.78
桑柘坪	PY5	112	1.80	3.33	2.99	43.66	34.75	0.25	39.66
南川	JY194-3	111	2.01	3.45	2.72	47.16	34.71	0.21	39.41
焦石坝	JY1	89	2.35	4.28	2.50	38.21	41.62	0.18	35.00

下载: 导出CSV

表 3 四川盆地东南缘不同区块典型井优质页岩段评价参数对比

Table 3. Evaluation parameters of high-quality shale section in typical wells in different blocks, southeastern margin of Sichuan Basin

地区	代表井	优质页岩(龙一段①—⑤小层)
地区	代表井	厚度/m	w(TOC)/%	孔隙度/%	R_o/%	石英含量/%	黏土含量/%	泊松比	杨氏模量/GPa
道真	ZY1	31	3.5	4.77	2.45	52.57	26.56	0.22	22.50
武隆	LY1	32	4.4	4.21	2.58	62.56	25.59	0.20	41.04
桑柘坪	PY5	24	2.9	4.23	3.17	47.32	32.73	0.21	35.83
南川	JY194-3	35	3.2	3.77	2.72	54.87	28.64	0.18	40.54
焦石坝	JY1	38	3.6	5.86	2.65	48.56	31.53	0.15	33.00

下载: 导出CSV

表 4 重庆市东南部桑柘坪向斜页岩气井生产参数

Table 4. Production parameters of shale gas wells in Sangzheping syncline, southeastern Chongqing city

代表井	测试时间	测试日产气量/10⁴ m³	关井前日产气量/10⁴ m³	累计试采天数/d	开井天数/d	累产气量/10⁴ m³	平均日产气量/10⁴ m³	备注
PY1	2012.07	2.52	0.62	1 431	786	666.7	0.85
PY2	2015.02	1.11	0.48	386	279	147.0	0.53
PY3	2013.04	3.80	0.69	1 177	1 028	931.0	0.91
PY4	2014.05	2.68	0.83	667	542	515.3	0.95
PY5	2019.07	3.50		184	179	219.2	1.96	刚投产，每天15 h以销定产

下载: 导出CSV

表 5 四川盆地东南缘典型井地层压力系数与游离气含量

Table 5. Formation pressure coefficient and free gas content of typical wells, southeastern margin of Sichuan Basin

代表井	地层压力系数	游离气比例/%	测试日产气量/10⁴ m³	套压/MPa
JY194-3	1.32	64.9	34.3	20.7
LY1	1.08	56.0	4.6	10.1
PY1	0.96	43.7	2.52	2.68

下载: 导出CSV

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