黔北地区下寒武统牛蹄塘组页岩气地质调查井位优选

对黔北地区下寒武统牛蹄塘组页岩露头和实测剖面进行系统的基础地质调查基础上,对采集的页岩样品进行有机地球化学、矿物组成、物性条件及含气特点等实验测试分析.研究结果表明,下寒武统牛蹄塘组页岩在岑巩、石阡、铜仁一带分布稳定、埋藏适中,厚度在40～60m之间,有机碳含量普遍大于2.5％,有机质热演化程度高,处于成熟-过成熟阶段.页岩吸附含气量平均为2.74m3/t,并且TOC值与黏土矿物含量对其影响作用明显,在剖面上呈现规律性变化.优选并实施了位于黔北地区岑巩县羊桥乡的岑页1井,该井完井深度为1 526m,钻遏揭示的下寒武统牛蹄塘组黑色页岩厚度为53m,岩性以炭质页岩为主,气测录井发现页岩气显示.

The Optimum Selecting of Shale Gas Well Location for Geological Investigation in Niutitang Formation in Lower Cambrian,Northern Guizhou Area

The paper systematically investigated the shale outcrops and profiles of Niutitang Formation in Lower Cambrian in Northern Guizhou Province,and a series of experiments of organic geochemistry,mineral composition,capacity of gas storage,porosity and permeability were conducted. The results show that,the shale of Niutitang Formation in Lower Cambrian has a stable distribution and favorable buried depth in Cengong-Shiqian-Tongren areas,and its thickness varies from 40 to 60 meters,the TOC is higher than 2.5%. The thermal evolution of organic matter is generally high,which indicates that the shale is in the stage of maturation to over maturation. The black shale contains an average of 2.74 cubic meters adsorption gas per ton. The TOC and clay mineral obviously impacted the gas potential,which was regularly changed in the profile. The Cenye 1 well was located and the well drilling was conducted in Yangqiao of Cengong area. The completion depth of Cenye 1 well is 1 526m and the black shale of Niutitang Formation in Lower Cambrian has been revealed for a total thickness of 53 meters,which enriched in carbon. What's more,the shale gas anomalies were monitored. 