Total sulfur distribution of source rock of the Upper Permian Longtan Formation and its response to sedimentary environment in Sichuan Basin

Fu Xiaodong; Qiu Nansheng; Qin Jianzhong; Tenger; Liu Wenhui; Wang Xiaofang

doi:10.11743/ogg20140307

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Total sulfur distribution of source rock of the Upper Permian Longtan Formation and its response to sedimentary environment in Sichuan Basin
Vol. 35, Issue 3, Pages: 342-349(2014)
Online First：08 June 2014，

Published：2014
DOI： 10.11743/ogg20140307
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DOI：

Fu Xiaodong, Qiu Nansheng, Qin Jianzhong, et al. Total sulfur distribution of source rock of the Upper Permian Longtan Formation and its response to sedimentary environment in Sichuan Basin[J]. 2014, 35(3): 342-349. DOI： 10.11743/ogg20140307.

摘要

通过对四川盆地龙潭组烃源岩全硫含量系统分析，研究了龙潭组烃源岩硫含量分布特征和控制因素，以及全硫含量对沉积环境的响应和指示意义。龙潭组不同岩性烃源岩全硫含量差异明显，泥页岩全硫含量高，灰岩硫含量则很低。烃源岩全硫含量（TS）与其总有机碳含量（TOC）、黄铁矿含量、干酪根碳同位素之间具有较好的正相关性。龙潭组烃源岩全硫含量和TOC/TS值对其沉积环境具有明显的响应和指示意义。川中、川东南等地区海陆交互相环境下形成的龙潭组烃源岩硫含量极高，TOC/TS值低；川东北地区台内凹陷、深水陆棚等环境下形成的烃源岩硫含量相对较高，TOC/TS值较高；盆地边缘城口、南江、石柱等地区碳酸盐台地、浅水陆棚等环境下形成的低有机质丰度灰岩烃源岩全硫含量低，而TOC/TS值高。

Abstract

Based on the systematic analysis of Total Sulfur content(TS)of source rock from the Upper Permian Longtan Formation(LTF)in Sichuan Basin

this paper studied the distribution feature of TS

its controlling factors as well as its responses to and significance as a indicator for sedimentary environment.Shale source rock of LTF is rich in sulfur

but limestone is poor in sulfur.TS has positive correlations with TOC

pyrites content and δ

C value of kerogen respectively.The TS and TOC/TS value of source rock have distinct responses to and significance as indicators for the sedimentary environment. Source rocks of LTF in paralic facies in middle and southern Sichuan Basin has high TS and low TOC/TS value.Source rocks in intra-platform sag or deep-water shelf facies in northeastern Sichuan Basin has relatively higher TS and TOC/TS value.And limestone in carbonate platform or shallow-water carbonate shelf facies in Chengkou

Nanjiang

Shizhu areas located at the edge of Sichuan Basin has low TS and high TOC/TS value.