大巴山前缘下寒武统黑色页岩气勘探前景分析
Shale gas accumulation conditions and exploitation prospect of Lower Cambrian black shale in Dabashan area
下寒武统水井坨组（也称牛蹄塘组）黑色页岩是下古生界海相黑色页岩最发育的层位之一，也是上扬子地区页岩气勘探的主要层位。本文以大巴山为研究地区，通过本次研究表明大巴山前缘：（1）水井坨组沉积环境为深水陆棚-大陆斜坡-深海盆地相；（2）水井坨组的厚度在200-300m之间，黑色页岩的厚度在30-195m之间，TOC>2%的厚度可达到60-90m，TOC>1%的厚度达到120-180m；（3）有机质类型较好, 主要为Ⅰ型一Ⅱ1型干酪根，有机碳含量较高， 为1.6%-3%，平均2%左右；R0为1%-4%，平均在3%左右；4）埋深主要在2500-3000m范围之内。因此， 各种参数对页岩气的富集和开发是非常有利的。但由于大巴山地区构造作用强烈，并且下寒武统为一个区域滑脱层，这可能对页岩气的富集起到破坏作用。
he black shale of Lower Cambrian Shuijingtuo Formation (also known as Niutitang Formation) is the most developed horizon among the Lower Paleozoic marine black shale in the Upper Yangtze region. This study of the Shuijingtuo Formation in the Dabashan area show: (1) the depositional environment was the deep water shelf - slope - the submarine basin; (2) sedimentary thickness was 200-300m, thickness of black shale was 30-195m, the thickness of the black shales with TOC> 2% was 60-90m and with TOC> 1% was 120-180m; (3) type of organic matter was type Ⅰ-Ⅱ type kerogen, the TOC was from 1.6% to 3% (averaging of 2%), R0 was from 1% to 4% (averaging of 3%); 4) the burial depth was 2500-3000m. These various parameters show the Shuijingtuo Formation is favorable for the enrichment and development of shale gas. However, strong tectonics and regional detachment effect is not favorable for shale gas enriching.
孙玮、冉波、叶玥豪、王世玉
石油天然气地质、石油天然气勘探
大巴山黑色页岩下寒武统非常规油气
abashan Black shale Lower Cambrian Unconventional oil and gas
孙玮,冉波,叶玥豪,王世玉.大巴山前缘下寒武统黑色页岩气勘探前景分析[EB/OL].(2014-02-28)[2025-08-16].http://www.paper.edu.cn/releasepaper/content/201402-649.点此复制
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