用Mo-TOC相关性估算海相泥质烃源岩原始有机碳的一种新方法——以藏南白垩系海相泥岩、页岩为例

A new method to estimate original organic carbon in the marine argillaceous source rocks according to Mo-TOC correlation:An example from the Cretaceous marine mudstones and shales in southern Xizang

关键词:  有机碳  烃源岩  高成熟度-过成熟度  Mo-TOC相关性  藏南地区  白垩纪  海相泥岩、页岩

Key words:  organic carbon  source rock  high-maturity and overmaturity  Mo-TOC correlation  southern Xizang  Cretaceous  marine mudstone and shale

摘要:

本文引入一种原始有机碳恢复的新方法,即利用Mo-TOC相关性来估算海相泥质烃源岩原始有机碳。并以藏南地区白垩纪海相泥岩、页岩为例,估算其原始有机碳含量及有机碳损失率。该方法可能在我国高成熟度-过成熟烃源岩的评价和油气资源量预测中发挥重要的作用。

Abstract:

The organic carbon and hydrocarbon potential have long been considered as two most important organic geochemical signatures in the assessment of the source rocks in sedimentary basins.The routine techniques for the recovery of organic matter abundance in the assessment of high-maturity and supermature source rocks include pyrolysis simulation and thermal-pressure simulation,which are not precise enough to be used alone or too expensive to be suitable for the popularization.In this paper,a new method is introduced to estimate original organic carbon in the marine argillaceous source rocks according to Mo-TOC correlation exemplified by the Cretaceous marine mudstones and shales in southern Xizang.If this method is viable,it will contribute a lot to the assessment and prediction of oil and gas resources in the high-maturty and overmature source rocks in China.