摘要
本文根据贵州晚二叠世56个定性的和62个定量的瓦斯资料作了贵州晚二叠世瓦斯分布图,并将瓦斯分布图与贵州晚二叠世岩相古地理图作对比,结果发现沉积环境严格控制着瓦斯的分布,即陆相冲积环境为低沼;三角洲环境为高沼——突出;三角洲间湾为低沼;潮坪环境为低沼—高沼;陆表海碳酸盐台地为低沼。据瓦斯分布情况,认为三角洲环境是最有利的甲烷气生成场所,结合生、储、盖等条件,指出六枝、二塘—汪家寨,金沙、织金等区是最有利的甲烷气勘探区。
A map of methane distribution has been charted according to 56 qualitative methane location samples and 62 quantitative methane location samples in Late Permian in Guizhou. Comparing the map of methane distribution'with the palaeogeographical map in Late Permian,it has been shown that the methane distribution is strickly controlled by sedimentary environment continental sedimentary environment belongs to low methane (lacking in methane ) .delta sedimentary environment belongs to high methane or higher methane(with abundant methane) ,interdeltaic bay sedimentary environment belongs to low methane, tidal environment belongs to high methane-low methane
(with abundant methane)and carbonate platform environment belongs to low methane (10m 3/t low).
As a result,we think that the delta environment is the most favourite sedimentary environment for forming high methahe. In addition,we discuss other factors affecting methane accumulation,such as coal -bed thickness,metamorphic degrees of coal -beds,depths of buried coal-beds and the ventilation of top and bottom walls of coal - beds. The associated favourite genetic, storage and cover
conditions show that Luzhi,Ertang-Wangjiazhai, Jinsha,Zhijin,etc. are the total resource of
these areas is estimated to reach 1670 billion m3.
出处
《贵州地质》
1990年第3期255-260,共6页
Guizhou Geology
