多组分碳同位素录井在天然气勘探中的应用——以琼东南盆地BD21地区为例
Application of multi-component carbon isotope logging in natural gas exploration:A case study of the BD21 area,Qiongdongnan Basin
胡益涛 1张焕旭 2倪朋勃 3郝为 3瞿煜扬 2校韩立2
作者信息
- 1. 中法渤海地质服务有限公司湛江分公司,广东 湛江 524057
- 2. 苏州冠德能源科技有限公司,江苏 苏州 215129
- 3. 中法渤海地质服务有限公司,天津 300450
- 折叠
摘要
为了了解琼东南盆地深海油气田天然气的成藏特征,对琼东南盆地天然气井进行了连续多组分碳同位素测量.通过对一口重点井连续碳同位素剖面测量及与周边井重点层段碳同位素值对比分析,探讨了该井天然气的成因类型与气源.结果表明:研究区三亚组一段以上为干气,以生物气和亚生物气为主,三亚组二段之下为湿气,为热成因气,主要是伴生气;BD21-1区块天然气存在两种来源,即始新统高熟油型气和特殊成因的低熟崖城组来源气.研究表明,多组分碳同位素录井技术可用于研究天然气的成因类型、气源及成熟度.
Abstract
This study aims to ascertain the accumulation characteristics of natural gas in the deep-water oil and gas fields in the Qiong-dongnan Basin.To this end,it performed continuous multi-component carbon isotope measurements for natural gas wells in the basin.Based on the comparative analysis of a continuous carbon isotope profile from a key well in the basin and the carbon isotope values from key intervals in surrounding wells,this study delved into the genetic types and sources of natural gas in the key well.The results show that dry gas occurs above the first member of the Sanya Formation,dominated by biogenic and secondary biogenic gases.In contrast,wet thermogenic gas exists below the second member of the formation,primarily including associated gas.Besides,natural gas in the BD21-1 block originates from two sources:Eocene high-maturity oil-formed gas and low-maturity gas with a special genesis from the Yacheng Formation.Overall,multi-component carbon isotope logging is effective in investigating the genetic types,sources,and matu-rity of natural gas.
关键词
琼东南盆地/碳同位素录井/成因类型/崖城组Key words
Qiongdongnan Basin/carbon isotope log/genetic type/Yacheng Formation引用本文复制引用
基金项目
中国海洋石油集团公司重大专项(YXKY-2021-ZJ-01)
出版年
2024
国家科技期刊平台
NSTL
万方数据