川南寒武系筇竹寺组勘探潜力研究

doi:10.13809/j.cnki.cn32-1825/te.2021.01.003

摘要/Abstract

摘要：

川南下寒武统筇竹寺组勘探实践表明,页岩厚度薄且多套叠置,页岩层段测试及试采效果不佳。为进一步落实该区有利勘探目标,实现寒武系筇竹寺组效益开发,开展了系统取心、岩心观察及实验分析。结果表明：①川南下寒武统筇竹寺组发育泥页岩、（泥质）粉砂岩、粉砂质页岩等多种岩性,页岩厚度相对较薄,纵向不连续沉积;②页岩热演化程度过高,储集空间类型以无机孔为主,含粉砂质储层段无机孔也占主导地位;③不同岩性的储层品质相当,均具备储集能力;④钻井揭示位于筇竹寺组中部的含粉砂泥页岩段厚度大、储层物性好、含气性好,是有利目标层段。研究认识对该区拓宽勘探思路具有重要的指导意义。

关键词: 拉张槽, 筇竹寺组, 富有机质页岩, 粉砂质泥页岩, 无机孔

Abstract:

The exploration of the lower Cambrian Qiongzhusi Formation in southern Sichuan Basin shows that the shale is thin with multiple strata series, which restricts the effects of testing and pilot production. In order to further implement the favorable exploration targets and realize the benefit development of the Cambrian Qiongzhusi Formation, systematic coring, core observation and experimental analysis have been carried out. The results show that: ①Shale,siltstone（or argillaceous siltstone）, silty shale and other lithology develop in the lower Cambrian Qiongzhusi Formation in southern Sichuan Basin. Shale is relatively thin with longitudinal discontinuous deposition. ②The thermal evolution degree of shale is too high. The reservoir spaces are mainly inorganic pores, meanwhile, inorganic pores are also dominant in silty reservoir section. ③The reservoir quality of various types of lithologic combination section are similar, and they all have storage capacity. ④Drilling reveals that the siltstone-bearing shale in the middle of Qiongzhusi formation is thick with good physical and gas-bearing property, which is the favorable target interval. The research and understanding is of great significance to broaden the exploration ideas in this area.

Key words: intracratonic sag, Qiongzhusi Formation, organic-rich shale, siltstone-bearing shale, inorganic pore

中图分类号:

TE122

熊亮,葛忠伟,王同,温真桃,钟文俊,周桦,何显莉. 川南寒武系筇竹寺组勘探潜力研究[J]. 油气藏评价与开发, 2021, 11(1): 14-21.

Xiong Liang,Ge Zhongwei,Wang Tong,Wen Zhentao,Zhong Wenjun,Zhou Hua,He Xianli. Exploration potential of Cambrian Qiongzhusi Formation in southern Sichuan Basin[J]. Reservoir Evaluation and Development, 2021, 11(1): 14-21.

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层	岩性	脆性矿物（%）	黏土矿物（%）
Ⅴ	黑色页岩	58	29
Ⅳ	粉砂质页岩与泥质粉砂岩互层	55.1~62.7	36.1~43.8
Ⅲ	黑色页岩	64	33
Ⅲ	泥质粉砂岩、粉砂质页岩	68.4~71.1	27.4~30.4
Ⅱ	黑色页岩	46	47
Ⅰ	粉砂质页岩与泥质粉砂岩互层	44.0~66.5	26.4~50.0

层	岩性	厚度（m）	TOC（%）
Ⅴ	黑色页岩	5.0~15.5	2.18
Ⅳ	粉砂质页岩与泥质粉砂岩互层	150~180	0.4~0.8
Ⅲ	黑色页岩	0~5.5	1.05
Ⅲ	泥质粉砂岩、粉砂质页岩	80~90	1.0~1.7
Ⅱ	黑色页岩	4~15	1.61
Ⅰ	粉砂质页岩与泥质粉砂岩互层	70~105	0.7~0.9

层	岩性	厚度（m）	渗透率（10^-3μm²）	孔隙度（%）
Ⅴ	黑色页岩	5.0~15.5		1.8
Ⅳ	粉砂质页岩与泥质粉砂岩互层	150~180	0.005 3	2.0~2.4
Ⅲ	黑色页岩	0~5.5		2.3
Ⅲ	泥质粉砂岩、粉砂质页岩	80~90	0.004 3	2.5~3.4
Ⅱ	黑色页岩	4~15		3.1
Ⅰ	粉砂质页岩与泥质粉砂岩互层	70~105	0.142 5	1.4~2.2

层	岩性	厚度（m）	含气量（m³/t）
Ⅴ	黑色页岩	5.0~15.5	1.5
Ⅳ	粉砂质页岩与泥质粉砂岩互层	150~180	1.8~2.4
Ⅲ	黑色页岩	0~5.5	2.2
Ⅲ	泥质粉砂岩、粉砂质页岩	80~90	2.7~3.8
Ⅱ	黑色页岩	4~15	1.6
Ⅰ	粉砂质页岩与泥质粉砂岩互层	70~105	1.5~2.4

井号	层位	产量（10⁴ m³/d）	重要构造事件	构造样式	保存条件
井号	层位	产量（10⁴ m³/d）	重要构造事件	构造样式	底板条件	输导体系	压力系数	评价
B201	∈₁q	1.08	桐湾运动（约520 Ma）	盆内背斜	平行不整合		1.01	中
B201-H1	∈₁q	1.00			优质白云岩	不整合面	1.00	中
B201-H3	∈₁q	1.60~2.80			平行不整合	断裂不发育		良
B5	∈₁q	2.46			平行不整合	贯通裂缝发育		差
A1	∈₁q	5.95			平行不整合	断裂不发育	1.51	良