塔西南山前石炭系斜坡相重力流沉积特征及油气地质意义

The Gravity Flow Depositional Characteristics of Carboniferous Slope Facies in the Piedmont in Southwestern Tarim Basin and Their Petroleum Geological Significance

塔西南地区山前构造带位于塔里木盆地西南部,介于叶尔羌河东南和杜瓦河西北之间。通过对塔西南山前构造带的实地考察、单井厚度标定、区域成图以及钻探岩心薄片的研究,辨识出沿斜坡发育的大量石炭系碳酸盐深水重力流沉积。这些沉积划分为四种主要类型:滑塌沉积、岩屑流沉积、浊流沉积和静水沉积。且实验分析和测井资料的解读,证实了重力流沉积能够形成较为优质的储油层。此项研究确认了塔里木盆地西南部石炭系斜坡带重力流沉积的特性及其油气地质意义,为未来的勘探开发活动提供了一些参考。The tectonic belt in the piedmont area of the southwestern Tarim Basin is located between the southeast of the Yarkant River and the northwest of the Duwa River. Through field investigations, single well thickness calibration, regional mapping, and the study of drilling core thin sections in the southwestern piedmont tectonic belt, a large number of Carboniferous carbonate deep-water gravity flow deposits along the slope have been identified. These deposits are classified into four main types: slump deposits, debris flow deposits, turbidity current deposits, and still-water deposits. Experimental analysis and interpretation of logging data confirm that gravity flow deposits can form relatively high-quality oil reservoirs. This study identifies the characteristics of Carboniferous slope gravity flow deposits in the southwestern Tarim Basin and their geological significance for oil and gas, providing some reference for future exploration and development activities.