塔东顺南1井区火山活动与断裂及热液作用关系

Relationship between volcanic activity and fault,hydrothermalism in Shunnan-1 3D well zone in Tadong area,Tarim basin

塔里木盆地虽广泛分布一到两期二叠系火山岩,但它们何时尖灭、如何尖灭、与奥陶系碳酸盐岩热液储层及断裂活动有无关系等均不十分清楚.在塔里木盆地东部顺南1井三维地震区内发育火山岩,且在奥陶系发现可能的热液储层气藏.本文根据钻井和三维地震仔细解释了火山岩的岩性、期次、展布、火山口位置和沉积尖灭线等,认为工区内二叠系只发育了一期库普库兹曼组玄武岩及凝灰岩,开派雷兹克组为陆源碎屑岩,周边顺南2井、古隆1井火山岩的缺失属于沉积缺失,非剥蚀缺失.火山口虽然分布在过顺南4井的北北东断裂两侧,但其位置也受早期NEE和NW向断裂带与晚期NNE向断裂交汇点的控制.此外,顺南1井工区奥陶系地层发育大量由热液溶蚀造成的片状强振幅异常以及管状强振幅异常,其中片状强振幅的分布与火山口位置有一定相似性,即受到多组断裂交汇以及断裂密集程度的控制.

The Tarim basin are widely distributed 1 to 2 stages Permian volcanic rock, but when and how do they pinching, the relationship between Ordovician carbonate thermal reservoir and fault activity is not very clear. The Shunnan-1 3D well zone in the east of Tarim basin develops volcanic rocks, and there is thermal reservoir in Ordovician layer. This paper explains the lithology, stage, distribution, crater position and deposition pinch-out line of volcanic rocks by the drilling data and 3D seismic data. The Permian in well zone developed one stage Kupkuciman Formation basaltic and tuff only, the Kaipeteicike Formation developed terrigenous clastic rock, the volcanic rocks of Shunnan 2 well, Gulong 2 well adjacently are deposition absence not erosion absen. Although the craters distributed on both sides of NNW faults that across the Shunnan 4 well, their positions were also controlled by the intersection of earlier NEE, NW faults and later NNE faults. Furthermore, Shunnanl well zone Ordovician layer developed abundant tubular strong amplitude anomaly and tabular strong amplitude anomaly that caused by thermal corrosion, and the distribution of tabular strong amplitude abnormity has similarity with the position of craters, controlled by the intersection of multi-group faults and the denseness of faults.