Influence of Fault and Magmatism on Oil and Gas Preservation Condition, to the West of Kangdian Ancient Continent: Taking Yanyuan Basin as an Example
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摘要: 盐源盆地复杂的断裂体系及频繁的构造与岩浆活动对盆地内页岩气及常规油气保存的影响有待探讨.通过对断裂、岩浆活动与两套主要烃源岩生排烃史的匹配性分析，认为：（1）盐源盆地的边界断裂及其伴生的次级断裂在喜马拉雅期均有活动，且其活动作用主要是破坏早期的油气藏，并对油气的空间配置进行再次调整，对自生自储的原位页岩气保存主要起破坏作用；（2）盐源盆地内部北东向与北西向两组褶皱中仍然可能残留保存相对较完好的构造圈闭，并且可能富含气和轻质油；（3）盐源盆地及邻区所发育的海西期、印支期、燕山期及喜山期4期岩浆活动对盐源盆地中油气生成与运移的有利作用在于催熟烃源岩，加速其生油气，并提供潜在的运移通道；不利作用在于会破坏有利圈闭或先期油气藏，且烃源岩中的岩浆底辟会对自生自储的原位页岩气保存起破坏作用.Abstract: In order to understand the influences of the complex faults, frequent tectonics and magmatic activitieson on hydrocarbon preservation condition in the Yanyuan Basin, the relationship between faults, magmatism and the thermal history of two primary source rock are analyzed in the adjacent areas to the west of Kangdian ancient continent in this study. The results indicate that:(1) the boundary faults and their associated secondary faults all have been active in the Himalayan period and their activities which mainly involves destroying the early oil and gas reservoirs and readjusting the spatial configuration of oil and gas, which mainly has been destructive in the self-generated in situ shale gas reservoirs. (2) The north-east and north-west folds within Yanyuan Basin may still retain relatively well-preserved structural traps and may be rich in gas and light oil. (3) In Yanyuan Basin and its adjacent areas, the Hercynian, Indosinian, Yanshanian and Himalayan magmatic activities have the following beneficial effects on hydrocarbon generation and migration:ripening source rocks, accelerating their hydrocarbon generation and providing potential migration channels; the negative effects include destroying the favorable traps or previous reservoirs, and destroying the self-generated and self-storage in situ shale gas by magmatic diapirism.
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Key words:
- shale gas /
- Yanyuan Basin /
- Kangdian ancient continent /
- preservation condition /
- magmatism /
- petroleum geology
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图 1 盐源盆地综合柱状图
榕树组据何原相和钱咏臻(2000)，稗子田地区早泥盆系发育情况据王成源等(2009)，其余地层参考四川省地质矿产研究所(1987)
Fig. 1. The comprehensive stratigraphic column of Yanyuan Basin
图 2 盐源盆地主要烃源岩生烃演化及岩浆活动期次
Fig. 2. The hydrocarbon-generation evolution of the major source rocks and the magmatism phases in Yanyuan Basin
图 3 盐源盆地及邻区构造、地层、岩浆及油气苗分布
Fig. 3. The structure, strata, magma and oil & gas show distribution in Yanyuan Basin and its adjacent areas
图 4 奥陶系印支期顺层侵入岩(补底拉打剖面)
Fig. 4. The Indosinian interbed intrusive rocks along Ordovician, Budilada Section
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