摘要:
中、上扬子地区下寒武统牛蹄塘组烃源岩分布广泛,在川东-鄂西-黔北-黔中一带,高有机质丰度的泥质烃源岩具有相当大的厚度。通过采集烃源岩样品分析,并根据前人对海相烃源岩评价标准,对该区牛蹄塘组海相烃源岩进行了综合评价。研究表明,中上扬子地区烃源岩有机碳含量总体很高,大部分烃源岩达到了好、很好的标准,有机质类型主要为I型,烃源岩Ro大部分都大于2.0%,平均3.15%,烃源岩已达过成熟阶段。通过以上分析,此地区油气勘探应以找气为主。此地区黑色泥页岩发育较好,为页岩气的研究提供了条件。
Abstract:
In the Niutitang Formation of lower Cambrian in the middle and upper Yangtze region in east Sichuan, west Hubei, and north and middle Guizhou, there occurs a thick sequence of marine argillaceous source rocks with high organic matter. Based on the analysis data and in accordance with the existing criteria for assessment of marine source rock, a comprehensive study was carried out by the authors. The results indicate that the organic carbon is high in the deposits, above the standard of good or better quality of source rocks. Almost all the organic matter belongs to Type I. The Ro of the source rock is higher than 2.0% with an average of 3.15%, suggesting that the source rocks have reached an over-matured stage. In this regard, gas should be the first priority in hydrocarbon exploration in this region. The black argillaceous rocks widely distributed in the region should be selected as the exploration target for shale gas.
下载: