Article

Petroleum Geology & Experiment

, 37:7

First online:

Open Access This content is freely available online to anyone, anywhere at any time.

Gas hydrate sources in Wuli-Kaixinling permafrost, southern Qinghai province

  • Shiqi TangAffiliated withSchool of Earth Sciences and Resources, China University of Geosciences (Beijing)Oil and Gas Survey, China Geological Survey
  • , Zhenquan LuAffiliated withOil and Gas Survey, China Geological Survey
  • , Xiaolin LuoAffiliated withDevelopment and Study Center, China Geological Survey
  • , Ting WangAffiliated withOil and Gas Survey, China Geological Survey
  • , Panpan TanAffiliated withSchool of Earth Sciences and Resources, China University of Geosciences (Beijing)Oil and Gas Survey, China Geological Survey

Abstract

Based on the past two years’ data on gas source survey in compliance with the National Thematic Project of Gas Hydrate Resources’ Exploration and Test-Production Engineering in the Wuli-Kaixinling permafrost of the southern Qinghai province, organic geochemical indicators were analyzed on the hydrocarbon (gas) source rocks of the Nayixiong Formation in the Upper Permian Wuli Group and the Bagong Formation in the Upper Triassic Jiezha Group. Results showed that organic matter contents were at moderate levels in the hydrocarbon (gas) source rocks of the two formations. The main organic matter was type III with high maturity. For most samples, organic matter was mature or over-mature, at the wet to dry gas phase. The source rocks produced a large amount of hydrocarbon gases to meet the needs of gas hydrate formation. Mudstones in the Nayixiong Formation in the Upper Permian Wuli Group and limestones in the Bagong Formation in the Upper Triassic Jiezha Group worked as major gas source rocks for gas hydrate formation.

Key words:

gas hydrate permafrost hydrocarbon (gas) source rock Wuli-Kaixinling southern Qinghai province

青海南部乌丽—开心岭冻土区 天然气水合物气源条件研究