塔里木盆地西南坳陷生油岩综合评价

SYNTHETIC EVALUATION OF SOURCE ROCKS IN SOUTHWEST DEPRESSION OF THE TARIM BASIN

丁勇 宫继萍 王辉

DING Yong GONG Ji-ping WANG Hui

中国新星石油公司西北石油局规划设计研究院, 新疆乌鲁木齐830011

Northwest Bureau of Petroleum Geology, CNSPC, Urumqi 830011, China

塔里木盆地西南坳陷主要沉积上第三系、上白垩统-下第三系、中下侏罗统、石炭-二叠系和寒武-奥陶系5套生油岩。寒武-奥陶系沉积中心在阿瓦提凹陷和塘古巴斯凹陷,有机质丰度高、类型好、成熟度高,是该区主要油气源岩。石炭系-下二叠统烃源岩分布广、丰度及类型多样、成熟度中到高,是该区次要油气源岩。侏罗系及下第三系生油岩是喀什凹陷、西南缘区主要生油岩。上第三系烃源岩主要分布于叶城凹陷山前区。

There mainly are 5 series of source rocks, including horizons in Upper Tertiary, Upper Cretaceous-Lower Tertiary, Middle-Lower Jurassic, Permo-Carboniferous and Cambrian-Ordovician, in Southwest Depression of the Tarim Basin. The depocenter of Cambrian-Ordovician lay in Awati sag and Tanggubasi sag, in which source rocks with high abundance of organic matter, good types and high maturity were developed. They formed the main source rocks in the depression. Source rocks in Permo-Carboniferous are characterized by wide distribution, varying in abundance and type of organic matter, middle to high maturity. The Jurassic and Lower Tertiary source rocks were mainly distributed in Kasi sag and the southwest margin of the depression, and the Upper Tertiary ones in the mountain front of Yecheng sag.

https://doi.org/10.11781/sysydz199904336