四川盆地蜀南地区长兴组油气成藏时空匹配

李延钧; 夏吉文; 李明隆; 蒲洪果; 耿超; 王浩

doi:10.11781/sysydz202006877

四川盆地蜀南地区长兴组油气成藏时空匹配

doi: 10.11781/sysydz202006877

李延钧^{1, 2,},
夏吉文³,
李明隆¹,
蒲洪果^4, ,,
耿超³,
王浩³

1.
油气藏地质及开发工程国家重点实验室, 西南石油大学, 成都 610500
2.
成都创源油气技术开发有限公司, 成都 610500
3.
中国石油西南油气田分公司蜀南气矿, 四川泸州 646000
4.
中国石化河南油田分公司勘探开发研究院, 河南南阳 473132

基金项目:

国家杰出青年科学基金 51125019

国家科技重大专项 2016ZX05004002-001

详细信息

作者简介:
李延钧(1966—)，男，博士，教授，从事油气成藏地球化学、非常规油气地质等研究。E-mail：llyyjj99@126.com

通讯作者:
蒲洪果(1977-), 男, 高级工程师, 从事石油地质综合研究。E-mail: 9809291292@sina.com

中图分类号: TE122.3
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- 被引次数: 0
出版历程
- 收稿日期: 2020-03-25
- 修回日期: 2020-09-28
- 刊出日期: 2020-11-28

Spatial-temporal modelling of oil and gas accumulation in Changxing Formation in the Shunan area, Sichuan Basin

LI Yanjun^{1, 2
,},
XIA Jiwen³,
LI Minglong¹,
PU Hongguo^{4
, ,},
GENG Chao³,
WANG Hao³

1.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
2.
Chengdu Chuangyuan Oil and Gas Technology Development Company, Chengdu, Sichuan 610500, China
3.
Shunan Gas Field, PetroChina Southwest Oil&Gas Field Company, Luzhou, Sichuan 646000, China
4.
Exploration&Development Research Institute of Henan Oilfield Company, SINOPEC, Nanyang, Henan 473132, China

摘要

摘要: 四川盆地蜀南地区上二叠统长兴组下伏3套烃源岩，分别为下志留统龙马溪组泥页岩、中二叠统泥质岩、上二叠统龙潭组煤系，长兴组已发现多个大中型气田，但对天然气的烃源一直认识不清。通过天然气组成和碳同位素分析表明，该区长兴组天然气以原油裂解气为主、甲烷含量高、干燥系数大，属于典型的干气；结合储层显微特征和包裹体均一温度分析测试，并综合分析油气成藏时空匹配关系，首次发现并证实蜀南地区长兴组天然气主要来源于深层志留系烃源岩，并混入少量的龙潭组煤系成因气；长兴组储层未捕获各期烃源岩生油高峰期生成的液态烃，以充气聚气为主；燕山运动早中期为主要充气期，而燕山末期—喜马拉雅早期为局部天然气充气期，与川东地区长兴组以龙潭组煤系来源的天然气不同。油气成藏时空匹配是圈闭有效捕获油气的关键，决定着油气来源和成藏富集程度，历史地、动态地揭示油气运聚过程是现代油气成藏研究的核心。
- 成藏模式 /
- 时空匹配 /
- 志留系烃源 /
- 长兴组 /
- 蜀南地区 /
- 四川盆地
Abstract: There are three sets of source rocks below the Changxing Formation in the southern Sichuan Basin, including the mud shale in Lower Silurian Longmaxi Formation, the argillaceous rock in Middle Permian, and the coal series in Upper Permian Longtan Formation. Many large and medium-sized gas fields have been discovered in the Changxing Formation, but the understanding of the source of natural gas is still unclear. The natural gas composition and carbon isotope analyses show that the natural gas of Changxing Formation in this area is mainly secondary gas (from crude oil cracking) and is characterized by high methane content and high dryness coefficient, which belongs to typical dry gas. Combined with the reservoir microscopic characteristics and the inclusion homogenization temperatures, a spatial-temporal model of hydrocarbon accumulation was constructed. The natural gas of Changxing Formation in the southern Sichuan Basin is mainly from a deep Silurian hydrocarbon source mixed with a small amount of coal series gas in the Longtan Formation. The reservoir in Changxing Formation did not capture the liquid hydrocarbon generated by the source rock at the peak of oil generation stages, so it mainly accumulates gas. The early and middle period of Yanshan Movement is the main period of gas accumulation, with partial accumulation in the Yanshanian-early Himalayan. The natural gas of Changxing Formation in the southern Sichuan Basin is different from that in the eastern Sichuan which is mainly from the coal series. The spatial-temporal timing is the key to effectively capture oil and gas in traps and determines the source and accumulation enrichment of oil and gas. It is the core of modern petroleum accumulation research to reveal the migration and accumulation process of oil and gas through history.
- hydrocarbon accumulation models /
- spatial-temporal matching /
- Silurian source rock /
- Changxing Formation /
- Shunan area /
- Sichuan Basin

HTML全文

图 1 四川盆地蜀南地区地理位置及部分层位岩性特征

Figure 1. Geographical location and lithologic characteristics of some horizons in Shunan area, Sichuan Basin

下载: 全尺寸图片幻灯片

图 2 四川盆地蜀南地区长兴组天然气成因类型

Figure 2. Genetic types of natural gas in Changxing Formation in Shunan area, Sichuan Basin

下载: 全尺寸图片幻灯片

图 3 川东地区和蜀南地区甲乙烷碳同位素区分天然气成因

Figure 3. Differentiation of natural gas genesis by carbon isotopes of methane and ethane in eastern Sichuan and Shunan area

下载: 全尺寸图片幻灯片

图 4 四川盆地蜀南地区长兴组储层显微特征

Figure 4. Microscopic characteristics of Changxing Formation reservoir in Shunan area, Sichuan Basin

下载: 全尺寸图片幻灯片

图 5 四川盆地蜀南地区长兴组成藏期次分析

Figure 5. Hydrocarbon accumulation period of Changxing Formation in Shunan area, Sichuan Basin

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图 6 四川盆地蜀南地区长兴组油气成藏时空匹配与模式

Figure 6. Spatial-temporal matching and model of hydrocarbon accumulation in Changxing Formation in Shunan area, Sichuan Basin

下载: 全尺寸图片幻灯片

表 1 四川盆地蜀南地区长兴组天然气组分统计

Table 1. Statistics of natural gas components of Changxing Formation in Shunan area, Sichuan Basin

构造	甲烷含量/%	乙烷含量/%	C₂₊含量/%	lg(C₁/C₂₊)	CO₂含量/(g·m^-3)	N₂含量/%	样品数
丹凤场	98.19	0.47	0.51	2.29	8.46	0.33	6
李子坝	98.66	0.51	0.55	2.22	11.12	0.19	10
东山	96.97	0.69	0.75	2.12	8.18	0.80	6
来苏	97.98	0.64	0.70	2.15	10.37	0.76	3
临峰场	97.49	0.58	0.61	2.20	24.75	0.54	6
塘河	98.23	0.33	0.35	2.45	17.00	0.33	8
永安场	98.32	0.53	0.59	2.22	15.20	0.30	4
自流井	97.64	0.35	0.39	2.39	0.64	1.64	5
德胜	98.33	0.58	0.63	2.19	0.74	0.27	3
古佛山	97.83	0.84	0.96	2.01	16.96	0.31	3
九奎山	97.94	0.65	0.71	2.14	0.98	0.33	10
龙洞坪	98.14	0.69	0.75	2.12	13.43	0.36	8
阳高寺	98.81	0.48	0.52	2.28	0.87	0.58	11
鹿角场	98.36	0.46	0.50	2.29	11.78	0.12	12
河包场	98.12	0.52	0.54	2.26	12.93	0.67	15
黄家场	96.86	0.89	0.91	2.03	49.47	0.66	5
界石场	98.59	0.53	0.55	2.25	0.73	0.79	9
白节滩	98.37	0.49	0.56	2.25	10.56	0.43	5

下载: 导出CSV

表 2 川东地区与蜀南地区天然气组成及碳同位素分析

Table 2. Composition and carbon isotope analysis of natural gas in eastern Sichuan and Shunan area

地区	构造	井号	产层	δ¹³C₁/‰	δ¹³C₂/‰	CH₄/%	C₂₊/%	lg(C₁/C₂₊)
蜀南	丹风场	丹7	P₃ch	-34.1	-32.8	98.92	0.44	2.35
蜀南	丹风场	丹7	P₃ch	-32.0	-33.6	98.92	0.44	2.35
蜀南	丹风场	丹10	P₃ch	-32.5	-33.9	98.66	0.54	2.26
蜀南	朱沱	朱3	P₃ch	-32.9	-33.1	98.27	0.55	2.26
蜀南	阳高寺	寺41	P₃ch	-34.2	-33.3	94.42	0.57	2.22
蜀南	龙洞坪	洞21-1	P₃ch	-34.1	-30.6	98.14	0.75	2.12
蜀南	荷包场	包004-X1	P₃ch	-33.0	-34.6	98.12	0.54	2.26
蜀南	荷包场	包38C1	P₃ch	-32.8	-34.5	91.71	0.66	2.14
蜀南	界石场	界14	P₃ch	-33.9	-35.6	98.50	0.79	2.09
川东	卧龙河	卧3	T₁j₁⁵	-32.7	-28.9	92.91	1.33	1.84
川东	卧龙河	卧6	T₁j₁⁵	-32.6	-28.2	92.92	1.45	1.81
川东	卧龙河	卧25	T₁j₁⁵	-33.0	-29.0	93.00	1.20	1.89
川东	卧龙河	卧19	T₁j₃⁴	-32.6	-28.9	92.89	1.43	1.81
川东	卧龙河	卧17	T₁j₁⁴	-32.4	-28.9	94.94	1.11	1.93
川东	卧龙河	卧5	T₁j₁³	-33.1	-29.4	94.36	1.41	1.83
川东	板东	板东4	P₃ch	-32.4	-30.9	91.70	1.76	1.72

下载: 导出CSV

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