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

Abstract

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

CLC Number:

TE122

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.

Figures/Tables 17

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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

Exploration potential of Cambrian Qiongzhusi Formation in southern Sichuan Basin

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分类	厚度（m）	埋深（m）	热演化（%）	TOC（%）	顶底板条件
Ⅰ	>20	<3 500	2.0~3.0	>1.0	优良
Ⅱ	>20	3 500~4 000	>2.0	>1.0	适中
Ⅲ	>20	4 000~4 500	>2.0	>1.0	较差

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