四川盆地东部中上寒武统洗象池群油气成藏条件与主控因素

孙自明; 孙炜; 林娟华; 马强

doi:10.11781/sysydz202106933

四川盆地东部中上寒武统洗象池群油气成藏条件与主控因素

doi: 10.11781/sysydz202106933

中国石化石油勘探开发研究院, 北京 102206

基金项目:

中国石化科技部项目 P19022-3

中国石化科技部项目 P21042-2

详细信息

作者简介:
孙自明(1964-), 男, 博士, 高级工程师, 从事油气勘探研究。E-mail: sunzm.syky@sinopec.com

中图分类号: TE122.3
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出版历程
- 收稿日期: 2021-01-27
- 修回日期: 2021-09-14
- 刊出日期: 2021-11-28

Hydrocarbon accumulation conditions and main controlling factors of the Middle-Upper Cambrian Xixiangchi Group in the eastern Sichuan Basin

SINOPEC Petroleum Exploration and Production Research Institute, Beijing 102206, China

摘要

摘要: 以露头和钻井资料为基础，在对四川盆地东部中上寒武统洗象池群油气成藏条件分析的基础上，结合钻井勘探成果，探讨油气成藏主控因素，明确了洗象池群的有利勘探方向。洗象池群储层以泥晶和粉晶白云岩为主，储集空间主要为白云石晶间孔、晶间溶孔和溶洞等，储层品质一般较差；纵向上，洗象池群具有下寒武统筇竹寺组和上奥陶统五峰组—下志留统龙马溪组2套烃源岩；志留系泥页岩和下奥陶统泥质岩类可分别作为洗象池群的区域盖层和局部盖层；优质储层是洗象池群油气成藏的必要前提，源—储配置样式及其有效性是油气成藏的关键；尽管研究区洗象池群具有上、下2套烃源岩供烃的可能，但受中寒武统膏盐岩层的阻隔，下伏下寒武统筇竹寺组烃源岩生成的油气难以向上运移到洗象池群聚集成藏，而盐上层系发育的一系列断背斜空间上易于构造出五峰组—龙马溪组烃源岩与洗象池群储层有效的源—储配置形式，有利于洗象池群形成“新生古储”油气藏。
- 主控因素 /
- 源—储配置 /
- 油气成藏条件 /
- 洗象池群 /
- 寒武系 /
- 四川盆地东部
Abstract: The petroleum geological elements and main controlling factors of the Middle-Upper Cambrian Xixiangchi Group in the eastern Sichuan Basin were systematically analyzed on the basis of geological outcrops and drilling data. Results showed that the reservoir lithology of the Xixiangchi Group was mainly micritic and silt-crystal dolomites, and the reservoir space was dominated by dolomite inter-crystalline pores, inter-crystalline dissolved pores and karst caves, etc., at the meantime, the reservoir quality is generally poor. The Xixiangchi Group was vertically composed by two sets of source rocks strata: the underlying Lower Cambrian Qiongzhusi Formation and the overlying Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation. The Silurian shale and the Lower Ordovician argillaceous rocks acted as regional and local cap rocks of the Xixiangchi Group. High-quality reservoirs are the necessary prerequisite for hydrocarbon accumulation in the Xixiangchi Group, and the source-reservoir spatial configuration and its effectiveness are the key factors to hydrocarbon accumulation. Though the Xixiangchi Group could have been charged by natural gas generated from the underlying and the overlying source rocks, it is difficult for the natural gas generated from the underlying source rocks to migrate up to the Xixiangchi Group due to the barrier of the Cambrian gypsum layers. However, the faulted anticlines developed over the Cambrian gypsum layer were favorable for hydrocarbon accumulation because they could change and construct a series of effective source-reservoir spatial configuration between the Wufeng-Longmaxi source rocks and the Xixiangchi reservoirs, and finally formed reservoirs with "young source in old reservoir" in the Xixiangchi Group.
- main controlling factor /
- source-reservoir spatial configuration /
- hydrocarbon migration and accumulation element /
- Xixiangchi Group /
- Cambrian /
- eastern Sichuan Basin

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图 1 四川盆地构造区划

据参考文献[21]修改。

Figure 1. Structural divisions of Sichuan Basin

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图 2 四川盆地东部下古生界地层综合柱状图

Figure 2. Comprehensive stratigraphic histogram of the Lower Palaeozoic strata in eastern Sichuan Basin

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图 3 四川盆地东部及邻区上奥陶统五峰组—下志留统龙马溪组烃源岩等厚图

Figure 3. Isogram of source rocks of Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation in the eastern Sichuan Basin and its periphery

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图 4 四川盆地建深1井寒武系洗象池群孔隙度(a)和渗透率(b)频率分布

Figure 4. Frequency distribution of porosity (a) and permeability (b) of Xixiangchi Group in well Jianshen 1, Sichuan Basin

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图 5 四川盆地东部及邻区寒武系洗象池群岩相古地理

据参考文献[5, 8, 13, 16-18]修改。

Figure 5. Lithofacies paleogeographic map of Xixiangchi Group in the eastern Sichuan Basin and its periphery

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图 6 四川盆地东部寒武系洗象池群沉积构造、溶蚀现象与裂缝

a.粉晶白云岩，半充填和全充填溶蚀孔洞，焦石1井，2 934.39~2 934.89 m；b.薄层砾屑白云岩，底部发育2~3个冲刷面，仁怀坛长镇；c.灰色与浅灰色厚层粉晶白云岩，冲刷面，习水永安镇；d.中厚层白云岩，溶蚀溶孔发育，仁怀坛长镇；e.灰色细粉晶白云岩，发育岩溶角砾岩，平桥1井，3 122.85~3 140.81 m；f.粉晶白云岩和微裂缝，裂缝为白云石充填，平桥1井，3 135.21 m

Figure 6. Sedimentary structures, karstification and fractures of the Xixiangchi Group in the eastern Sichuan Basin

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图 7 四川盆地东部平桥构造气藏成藏模式

.高台组；.洗象池群；O₁t-O₃l.下奥陶统桐梓组—上奥陶统临湘组；O₃w—S.上奥陶统五峰组—志留系
1.含膏盐岩；2.上奥陶统五峰组—下志留统龙马溪组烃源岩；3.洗象池群气藏；4.逆断层；5.油气运移方向

Figure 7. Hydrocarbon migration and accumulation pattern of Pingqiao gas-bearing structure in the eastern Sichuan Basin

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