川中古隆起北斜坡构造演化及其对震旦系—寒武系油气成藏的控制

李强; 柳广弟; 宋泽章; 孙明亮; 朱联强; 田兴旺; 马奎; 杨岱林; 王云龙; 曹玉顺; 游富粮

doi:10.11781/sysydz202206997

川中古隆起北斜坡构造演化及其对震旦系—寒武系油气成藏的控制

doi: 10.11781/sysydz202206997

李强^{1, 2,},
柳广弟^{1, 2, ,},
宋泽章^{1, 2},
孙明亮^{1, 2},
朱联强^{1, 2},
田兴旺³,
马奎³,
杨岱林³,
王云龙³,
曹玉顺^{1, 2},
游富粮^{1, 2}

1.
中国石油大学(北京) 地球科学学院，北京 102249
2.
油气资源与探测国家重点实验室，北京 102249
3.
中国石油西南油气田分公司勘探开发研究院，成都 610041

基金项目:

国家重点研发计划 2017YFC0603106

中国石油西南油气田分公司横向项目 JS2021-096

详细信息

作者简介:
李强(1997—)，男，博士研究生，从事石油地质及油气成藏机理研究。E-mail: liq8013@163.com

通讯作者:
柳广弟(1961—)，男，博士，教授，从事油气藏形成与分布等方面的教学与科研工作。E-mail: lgd@cup.edu.cn

中图分类号: TE122.3
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- 被引次数: 0
出版历程
- 收稿日期: 2021-11-18
- 修回日期: 2022-10-08
- 刊出日期: 2022-11-28

Influence of tectonic evolution of the northern slope in the central Sichuan paleo-uplift on the Sinian-Cambrian hydrocarbon accumulations

LI Qiang^{1, 2
,},
LIU Guangdi^{1, 2
, ,},
SONG Zezhang^{1, 2},
SUN Mingliang^{1, 2},
ZHU Lianqiang^{1, 2},
TIAN Xingwang³,
MA Kui³,
YANG Dailin³,
WANG Yunlong³,
CAO Yushun^{1, 2},
YOU Fuliang^{1, 2}

1.
College of Geosciences, China University of Petroleum Beijing (Beijing), Beijing 102249, China
2.
State Key Laboratory of Petroleum Resource and Prospecting, Beijing 102249, China
3.
Research Institute of Exploration and Development, Southwest Oil & Gas Field Company, PetroChina, Chengdu, Sichuan 610041, China

摘要

摘要: 川中古隆起北斜坡震旦系—寒武系致密碳酸盐岩是当前四川盆地深层油气勘探的热点，古隆起北斜坡的构造演化决定了成藏演化过程和当前的油气分布。基于单井、地震、分析化验数据，优选盆地模拟软件中的古构造恢复功能，重点恢复了北斜坡和高石梯—磨溪地区(高—磨地区)寒武系底界的构造演化过程，重建了油气成藏关键时期的构造格局。北斜坡在桐湾期末为局部隆起高部位，与更高部位的高—磨地区之间存在古地貌洼地；加里东晚期北斜坡与高—磨地区为似“鞍—穹状”构造格局；印支期磨溪以北地区逐渐北倾形成单斜；燕山早期斜坡区的地层倾角进一步加大，至燕山中期倾角趋于稳定，基本与现今构造格局一致。北斜坡桐湾期的古构造形态为大面积的震旦系灯影组台缘—台内滩储层发育提供了良好的物质条件。此外，在大规模海侵控制下，北斜坡和德阳—安岳裂陷槽部位由于沉积水体更深、局限—缺氧和古生产力程度更高，更有利于寒武系筇竹寺组黑色页岩的发育。北斜坡震旦系—寒武系古油藏相对高—磨地区更早发生热裂解，加之源岩特征的差异共同导致北斜坡天然气δ¹³C₁比高—磨地区气藏的更轻。局部构造高点与岩性圈闭的耦合控制了北斜坡地区独立的古油藏—气藏的形成和保存。
- 构造演化 /
- 震旦系—寒武系 /
- 成藏演化 /
- 川中北斜坡 /
- 四川盆地
Abstract: The Sinian-Cambrian tight carbonate strata locating on the northern slope (NS) of the paleo-uplift of central Sichuan Basin is the frontier for ultra-deep natural gas exploration. The tectonic evolution of the NS determined the accumulation process and current distribution of oil and gas. In this study, based on integrating drilling, seismic and test data, a 3D basin simulation software was used to carry out the structural restoration. This paper focused on the restoration of the tectonic evolution at the bottom of Cambrian in the NS and Gaoshiti-Moxi (GM) areas, and the tectonic pattern of hydrocarbon accumulation during critical periods was re-constructed. At the end of the Tongwan Movement, the NS area was locally uplifted to the high regions, while paleo-geomorphic depressions formed between the NS and GM areas. In the Late Caledonian, the NS and GM areas displayed a structural pattern similar to 'saddle-domal'. In the Indosinian period, the area to the north of Moxi gradually inclined northwards to form a monocline. In the early stage of Yanshanian Movement, the dip angle of Cambrian in the NS area further increased until it became stable and was consistent with the current tectonic pattern found after Mid-Yanshanian Movement. The paleo-tectonic morphology in the NS area during the Tongwan period laid a solid foundation for the development of large-scale platform margin and inner beach reservoirs in the Sinian Dengying Formation. Controlled by large-scale transgression, the NS area and the Deyang-Anyue rift trough were more conducive to the development of black shale in the Qiongzhusi Formation due to deeper sedimentary water body and higher degree of confinement-hypoxia. The oil-cracking in the Sinian-Cambrian paleo-oil reservoirs of the NS area occurred earlier than that in the GM area. The difference between thermal evolution and source rock characteristics of the Qiongzhusi Formation in the NS and GM areas led to a lighter δ¹³C₁ of natural gas in the NS area. The coupling of local tectonic highs and lithologic traps controlled the formation and preservation of independent paleo-oil and natural gas reservoirs in the NS area.
- tectonic evolution /
- Sinian-Cambrian /
- evolution process /
- northern slope of central Sichuan /
- Sichuan Basin

HTML全文

图 1 四川盆地二叠纪前古地质(a)与北斜坡和高—磨地区寒武系底构造(b)

据文献[3, 19]修改。

Figure 1. Pre-Permian paleogeological map of Sichuan Basin (a) and structural map of Cambrian bottom in the northern slope and Gaoshiti-Moxi areas (b)

下载: 全尺寸图片幻灯片

图 2 川中古隆起北斜坡和高—磨地区寒武系底界随构造演化

a.桐湾Ⅱ幕结束; b.加里东早期; c.海西早期; d.海西晚期; e.印支期; f.燕山早期; g.燕山中期; h.现今

Figure 2. Cambrian bottom evolving with tectonic movements in the northern slope and Gaoshiti-Moxi areas, central Sichuan paleo-uplift

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图 3 川中古隆起北斜坡和高—磨地区寒武系底界古构造图切剖面法示意

a.高—磨地区至北斜坡地震剖面; b.古构造地质模型; c.图切剖面获取的寒武系底构造形态，剖面位置见图 1b中的a-a′

Figure 3. Tectonic evolution section of Cambrian bottom in the northern slope and Gaoshiti-Moxi areas, central Sichuan paleo-uplift

下载: 全尺寸图片幻灯片

图 4 川中古隆起北斜坡和高—磨地区寒武系筇竹寺组源岩发育特征

a.烃源岩厚度与灯影组丘滩体叠合, 据文献[3]修改; b-c.筇竹寺组顶拉平的连井剖面，剖面位置见a图中b-b′和b-c′

Figure 4. Development characteristics of source rocks in Cambrian Qiongzhusi Formation in the northern slope and Gaoshiti-Moxi areas, central Sichuan paleo-uplift

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图 5 川中古隆起北斜坡和高—磨地区寒武系筇竹寺组烃源岩TOC和Mo含量关系

图中界限基于文献[39]，数据基于文献[38, 44]; 虚线代表斜率(10^-4)，其中黑海为4.5±1;挪威Framvaren海湾为9.0±2

Figure 5. Relationship between TOC and Mo contents of CambrianQiongzhusi Formation in the northern slope and Gaoshiti-Moxi areas, central Sichuan paleo-uplift

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图 6 川中古隆起北斜坡震旦系灯影组储层岩心及薄片特征

a.PT1井, 灯二段, 5 741.06~5 741.2 m, 残余溶蚀孔洞发育, 沥青充填溶蚀孔洞; b.ZJ2井, 灯二段, 6 546.27 m, 储层固体沥青充填; c.PT1井, 灯二段, 5 729.94 m(铸体薄片), 沥青充填在孔洞中, 仍残余较大的孔洞; d.ZJ2井, 灯二段, 6 554.3 m (铸体薄片), 沥青少量充填在孔洞边缘中, 残余较大的孔洞

Figure 6. Characteristics of reservoir cores and thin slices of Sinian Dengying Formation in the northern slope and Gaoshiti-Moxi areas, central Sichuan paleo-uplift

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图 7 川中古隆起北斜坡和高—磨地区震旦系—寒武系油气演化过程差异

a.灯四段中部储层温度；b.灯四段原油转化率，动力学参数来自文献[50]；c.天然气碳同位素，数据来自文献[8, 45]。

Figure 7. Difference of hydrocarbon evolution process of Sinian and Cambrian between the northern slope and Gaoshiti-Moxi areas, central Sichuan paleo-uplift

下载: 全尺寸图片幻灯片

图 8 川中古隆起北斜坡和高—磨地区关键时期震旦系—寒武系油气成藏演化示意

Figure 8. Evolution of hydrocarbon accumulation in Sinian and Cambrian at critical period in the northern slope and Gaoshiti-Moxi areas, central Sichuan paleo-uplift

下载: 全尺寸图片幻灯片

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