深层火成岩侵入体和相关构造发育特征及其石油地质意义——以塔里木盆地顺北地区为例

为加深对塔里木盆地顺北地区岩浆侵入作用的研究,运用研究区丰富的三维地震资料,在详细刻画火成岩侵入体及相关构造发育特征和展布规律的基础上,建立了岩浆的垂向侵入模式,确立了岩浆的侧向流动方向,探讨了其石油地质意义.结果 表明,顺北地区的碟形火成岩侵入体一般沿中、下奥陶统顶界面及以上界面层状叠置分布,碟形岩床之上发育逆断层和...

Characterization and petroleum geological significance of deep igneous intrusions and related structures in the Shunbei area,Tarim Basin

The magma intrusion in the Shunbei area， Tarim Basin， is investigated based on newly acquired 3D seismic data. The igneous intrusions and related structures in the area are characterized and mapped in detail to establish a vertical intrusion model， determine lateral flow direction of magma， and reveal their petroleum significance. The igneous intrusions are saucer-shaped and distribute along the top boundary of the Lower-Middle Ordovician and the boundaries of strata above it in layered superimposition. Reverse faults and steep fractures occur above the saucer-shaped sills， leading to a vertical magma intrusion model of “magma pathway-superimposed sills-steep structure”. The actual distribution of the sills and related structures reveal that the magma in this area fisrt intruded from the deep to the top of the Middle-Lower Ordovician and then flew laterally from north to south in a radial pattern. All these suggest that igneous intrusions play a role in improving reservoir quality and the related reverse faults are the pathways for hydrocarbon to migrate. A deeper understanding of the sills and related structures can be a better guidance for oil and gas exploration in the Shunbei area or even the whole Tarim Basin.