塔里木中部二叠纪玄武岩分布的重新厘定：基于测井数据的新认识

Redefined Distribution of the Permian Basalt in the Central Tarim Area:A New Approach Based on Down Hole Logging Data Explanation

塔里木盆地二叠纪普遍发育火成岩,分布面积广且喷发规模巨大,但由于早期露头、钻井和航磁资料的有限性,盆地内部的大片区域都缺少露头和钻井资料,特别是塔中地区具有厚层沉积物覆盖,导致前人所做的研究成果具有一定的局限性,其圈定的玄武岩分布范围不是十分准确。但近年来,随着塔里木油田在盆地内油气勘探工作的不断深入,有关火成岩的测井和地震等地球物理资料日益丰富,可以更好地反映玄武岩在地下的分布情况。本文综合利用钻井、测井、地震等资料,特别是基于测井数据的新认识对塔里木盆地中部地区二叠纪玄武岩分布进行重新厘定,结果显示玄武岩在塔里木盆地中部分布的范围比前人圈定的范围更广泛,有利于进一步研究玄武岩在整个塔里木盆地的空间分布情况。

Permian igneous rocks are widely distributed in the Tarim Basin. Some researchers have done a lot of works on the Permian volcanic rocks, but the results are not very perfect because of the limitations of outcrops, drilling and aeromagnetic data. However, with the progress of oil exploration in the Tarim oil field in recent years, availability of much more logging and seismic data give much understanding of the distribution of basalt in the Tarim Basin. This study redefined the distribution of Permian basalt in the central Tarim area through the comprehensive reseach of outcrops, drilling, logging, 2D seismic interpretation, especially the new approach based on down hole logging data interpretation. The results show that the Permian basalt is distributed much more widely than previous study suggested, and this will be of great significance for the much understanding of the distribution situation of the basalt in the Tarim Basin.