萍乐坳陷中部GFD1井页岩气富集模式

doi:10.13278/j.cnki.jjuese.20190114

摘要/Abstract

摘要： 为调查评价萍乐坳陷中部二叠系乐平组页岩气资源潜力，于丰城地区部署了页岩气地质调查井——GFD1井。以GFD1井的资料为基础，对乐平组富有机质页岩有机地球化学、岩石学、含气性等特征进行系统分析。结果表明：丰城地区二叠系层序完整，乐平组富有机质页岩厚度大，有机质类型以Ⅱ₂-Ⅲ型为主，有机碳质量分数高，热演化程度已进入高成熟生气阶段；脆性矿物平均质量分数为34.84%，具有后期压裂改造的前提条件；随钻气测录井曲线可见两段明显异常。对岩心进行实时现场解吸，煤层气含气量普遍大于1.00 m³/t，平均达3.54 m³/t；页岩气含气量介于0.10~1.50 m³/t之间，平均为0.54 m³/t；致密砂岩气含气量一般小于0.30 m³/t。GFD1井所处的曲江向斜北翼完整，南翼被一条逆断层挤压，具有较好的封堵性，有利于页岩气保存，形成原地宽缓斜坡型页岩气富集模式。

关键词: 萍乐坳陷, 乐平组, 页岩气, 富集模式

Abstract: In order to investigate the potential of oil and gas resources of Upper Permian Leping Formation in Pingle depression, the well GFD1 was deployed to prospect shale gas, coal bed gas, and tight sandstone gas in Qujiang syncline in Fengcheng area, in central Jiangxi Province. The shale gas enrichment model was studied based on the data of drilling, organic geochemistry, petrological parameter, and gas-bearing characteristics, etc. The type of organic matter is mainly type Ⅱ₂-Ⅲ. The total organic carbon (TOC) content in Wangpanli Member and Laoshan Member is sufficient with high-maturity. The average brittle mineral mass percent is 34.84%, which is prone to later fracturing. The high logging of total hydrocarbon indicates that the gas is rich in this syncline. The field desorption shows that the coal bed gas is more than 1.00 m³/t, with an average of 3.54 m³/t, the shale gas content varies between 0.10 and 1.50 m³/t, with an average of 0.54 m³/t, and the tight sandstone gas is lower than 0.30 m³/t. The structure of the north side of Qujiang syncline is normal, while the south side is a reverse fault, which is benefitial for oil and gas sealing.

Key words: Pingle depression, Leping Formation, shale gas, enrichment model

中图分类号:

TE122

滕龙, 沈雪华, 方朝刚, 郑红军, 朱应新. 萍乐坳陷中部GFD1井页岩气富集模式[J]. 吉林大学学报(地球科学版), 2020, 50(3): 757-767.

Teng Long, Shen Xuehua, Fang Chaogang, Zheng Hongjun, Zhu Yingxin. Shale Gas Enrichment Model of Well GFD1 in Middle Pingle Depression, Jiangxi Province[J]. Journal of Jilin University(Earth Science Edition), 2020, 50(3): 757-767.

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