松辽盆地长岭断陷变质核杂岩带的发现及其控油气作用研究

Discovery of metamorphic core complex in Changling Faulted Depression and its controls on hydrocarbons

陆建林 左宗鑫 李瑞磊 王苗 王保华 朱建峰

LU Jianlin ZUO Zongxin LI Ruilei WANG Miao WANG Baohua ZHU Jianfeng

1. 中国石化 石油勘探开发研究院 无锡石油地质研究所, 江苏 无锡 214126; 2. 中国石化 东北油气分公司, 长春 130062

1. Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China; 2. SINOPEC Northeast Branch Company, Changchun, Jilin 130062, China

变质核杂岩带是一类重要的地质现象。通过对松辽盆地长岭断陷的解剖，发现了松辽盆地下白垩统变质核杂岩带的存在。该变质核杂岩由深变质的核部、韧性流变的中间层与不变质的盖层组成，具有典型的三层结构。研究认为该变质核杂岩的隆升主要发生在早白垩世营城期，是营城期同构造岩浆的强烈侵位与区域伸展作用的共同产物；其形成机制可能是晚侏罗世造山运动结束后，由于早白垩世开始的造山带伸展垮塌及山根拆沉作用引发的地壳减薄与岩浆活动及区域性的大规模伸展拆离作用，形成了松辽盆地早白垩世断陷群与变质核杂岩带。根据其对所在地质构造带油气成藏的影响分析，认为它对龙凤山油气田的形成具有重要的控制作用，是一类重要的勘探领域。

Metamorphic core complex was discovered in the Changling Faulted Depression of Songliao Basin. This metamorphic core complex has a typical three-layer configuration, including the metamorphic core, the unmetamorphosed cover and the ductile shear belt. It uplifted during the Yingcheng period in the Early Cretaceous, caused by magmatic emplacement and large-scale extensional detachment. After the orogeny in the Late Jurassic, the orogen extension and collapse and mountain root delamination since the Early Cretaceous resulted in strong crustal thinning and large-scale extensional detachment. At the same time the faulted depression group and metamorphic core complex were formed in the Songliao Basin. The impact of the metamorphic core complex on oil and gas were discussed, suggesting that the metamorphic core complex has an important influence on hydrocarbon accumulation of the Longfengshan Oil-and-Gas Field, which shows good potential for oil and gas exploration.

中国石化科技专项“松南断陷油气聚集规律与精细评价关键技术”（ZDP17014）资助。

https://doi.org/10.11781/sysydz201806771