地球学报2025，Vol.46Issue(3)：615-622,8.DOI:10.3975/cagsb.2024.111512
羌塘盆地普若岗日地区索瓦组烃源岩特征
Source Rock Characteristics of Suowa Formation in Puruogangri Area,Qiangtang Basin
摘要
Abstract
The degree of oil and gas exploration in the Qiangtang Basin is low.To identify the potential of Jurassic Suowa Formation source rocks,the current study conducted total organic carbon extraction,chromatography-mass spectrometry,Ro determination,and isotopic analysis of the Puruogangri profile outcrop.This study aimed to define the source rock characteristics and formation environment of the Suowa Formation in Puruogangri area.The results showed that the total organic carbon content of the Suowa Formation source rocks in the study area ranges from 0.22%to 2.16%,with an average of 0.65%.The depositional environment is a reductive marine facies,with the parent material contributed by higher plants and algae.The kerogen isotopes indicated type III organic matter.Influenced by Paleogene volcanic activity,the source rocks were at a high-maturity stage,with Ro values ranging from 1.85%to 3.51%.A comprehensive analysis indicated that the Suowa Formation source rocks,centered around intrusive rocks(former heat sources)and within the radiation range of the Puruogangri profile,are gas-dominated.In areas distant from the intrusive rocks,the Suowa Formation source rocks could produce small amounts of crude oil.关键词
羌塘盆地/海相/烃源岩/成熟度/火山活动Key words
Qiangtang Basin/marine/source rock/maturity/volcanic activity分类
地质学引用本文复制引用
于珺,胡春桥,张洪美,黄峰,李娜,秦子建,李鑫龙..羌塘盆地普若岗日地区索瓦组烃源岩特征[J].地球学报,2025,46(3):615-622,8.基金项目
本文由陕西延长石油(集团)有限责任公司"羌塘盆地油气资源评价"项目(编号:YJKTS23SFW0003)资助. This study was supported by Shaanxi Yanchang Petroleum(Group)Company Limited(No.YJKTS23SFW0003). （集团）
