摘要
为了开展湖南省龙山区块牛蹄塘组页岩气资源评价及优选勘探有利区研究,本文通过地质调查和实验测试对该地层页岩气成藏主控因素和保存条件进行分析,并与邻近区的页岩气地质参数进行对比研究。研究结果表明,龙山区块牛蹄塘组页岩TOC平均值为2.73%,Ro平均值为2.57%,属于高成熟-过成熟阶段,具备较好的生烃条件。牛蹄塘组页岩脆性矿物含量平均值为60.42%,黏土矿物含量平均值为25.73%,孔隙度平均值为2.09%,渗透率平均值为0.0176 mD,具备较好的储集空间及开发条件。牛蹄塘组页岩顶底板均有致密岩性封堵,且无断裂切入,具有良好的页岩气保存条件;采用体积法估算页岩气资源量为1499.90×10^(8)~4555.96×10^(8) m^(3),资源丰度优于邻区,具备较好的资源潜力;勘探低风险区为洛塔向斜两翼及猛必向斜内埋深4000 m以浅的位置,是下一步勘探的首要优选区。研究成果加深了对龙山区块页岩气赋存条件的认识,为进一步开展页岩气勘探提供了参考。
In order to carry out the research on the evaluation of shale gas resources and the optimization of favorable exploration areas in Niutitang Formation of Longshan Block,Hunan Province.This paper analyzes the main controlling factors and preservation conditions of shale gas accumulation in this formation through geological investigation and experimental testing,and makes a comparative study with the geological parameters of shale gas in adjacent areas.The results show that the average TOC and Ro of the shale of Niutitang Formation in this area are 2.73%and 2.57%,which belong to the high mature over mature stage and have good hydrocarbon generation conditions.The average content of brittle minerals in Niutitang Formation shale is 60.42%,the average content of clay minerals is 25.73%,the average porosity is 2.09%,and the average permeability is 0.0176 mD,which has good reservoir space and development conditions.The shale roof and floor of Niutitang Formation are sealed by tight lithology,and there is no fracture cut in,so it has good shale gas preservation conditions.The shale gas resource calculated by volume method is 1499.90×10^(8)-4555.96×10^(8) m^(3),with good resource potential and resource abundance better than that of adjacent areas.The low-risk areas for exploration in this area are the two wings of Luota Syncline and the position with a buried depth of less than 4000 m in Mengbi Syncline.It is the primary preferred area for the next exploration.The research results have deepened the understanding of the occurrence conditions of shale gas in Longshan Block and provided a reference for further shale gas exploration.
作者
黄江杰
李常辉
潘志刚
HUANG Jiangjie;LI Changhui;PAN Zhigang(Hunan Institute of Hydrogeology and Environmental Geological Survey and Monitoring,Changsha 410129,China;Changsha Natural Resources Comprehensive Survey Center of China Geological Survey,Changsha 410600,China)
出处
《中国矿业》
2022年第9期171-178,共8页
China Mining Magazine
关键词
页岩气
资源评价
勘探有利区
牛蹄塘组
龙山区块
shale gas
resource evaluation
favorable exploration area
Niutitang Formation
Longshan Block
