| 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 |
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| 引用本文： | 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.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[J].石油实验地质,2022,44(6):997-1007. |
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| 作者姓名： | 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 |
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| 作者单位： | 1. 中国石油大学(北京) 地球科学学院, 北京 102249; |
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| 基金项目： | 国家重点研发计划(2017YFC0603106)和中国石油西南油气田分公司横向项目(JS2021-096)联合资助。 |
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| 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。
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| 关 键 词： | 构造演化 震旦系—寒武系 成藏演化 川中北斜坡 四川盆地 |
| 收稿时间： | 2021-11-18 |
Influence of tectonic evolution of the northern slope in the central Sichuan paleo-uplift on the Sinian-Cambrian hydrocarbon accumulations |
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| Affiliation: | 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 |
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| 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. |
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