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

doi:10.11720/wtyht.2024.2158

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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。

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	胡益涛
	张焕旭
	倪朋勃
	郝为
	瞿煜扬
	校韩立

关键词 ：琼东南盆地, 碳同位素录井, 成因类型, 崖城组

Abstract：

This study aims to ascertain the accumulation characteristics of natural gas in the deep-water oil and gas fields in the Qiongdongnan 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 maturity of natural gas.

Key words： Qiongdongnan Basin carbon isotope log genetic type Yacheng Formation

收稿日期: 2022-04-01 修回日期: 2023-07-17 出版日期: 2024-04-20

ZTFLH:	TE122.14
	P597

基金资助:中国海洋石油集团公司重大专项课题“双孔介质储层测录井综合评价技术与作业方案优化研究”(YXKY-2021-ZJ-01)

作者简介: 胡益涛(1984-),男,工程师,2008年毕业于长江大学地球物理学院,硕士,主要从事录井科研和生产管理工作。Email:huyt@cfbgc.com

引用本文:

胡益涛, 张焕旭, 倪朋勃, 郝为, 瞿煜扬, 校韩立. 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[J]. 物探与化探, 2024, 48(2): 348-355.
HU Yi-Tao, ZHANG Huan-Xu, NI Peng-Bo, HAO Wei, QU Yu-Yang, XIAO Han-Li. Application of multi-component carbon isotope logging in natural gas exploration: A case study of the BD21 area, Qiongdongnan Basin. Geophysical and Geochemical Exploration, 2024, 48(2): 348-355.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2024.2158 或 https://www.wutanyuhuatan.com/CN/Y2024/V48/I2/348

Table 1 BD21-1区块A井碳同位素标准样品验校记录

Fig.1 琼东南盆地天然气探井位置

Fig.2 多组分碳同位素剖面

层位	碳同位素/‰
层位	δ¹³C₁	δ¹³C₂	δ¹³C₃
黄流组	$- 72.57 ~ - 68.32 - 70.39 (155)$
梅山组	$- 70.42 ? ~ - 62.46 - 66.98 (82)$
三亚组一段	$- 64.69 ? ~ - 62.19 - 63.15 (69)$
三亚组二段	$- 64.87 ? ~ - 40.23 - 49.55 (948)$	$- 35.48 ? ~ - 26.37 - 30.25 (449)$	$- 35.92 ? ~ - 26.15 - 30.94 (282)$
陵水组二段	$- 43.18 ~ - 39.97 - 41.46 (62)$	$- 31.54 ~ - 26.78 - 29.29 (42)$	$- 30.97 ~ - 27.54 - 29.42 (35)$
陵水组三段	$- 46.26 ~ - 39.00 - 43.05 (621)$	$- 32.02 ~ - 25.94 - 28.31 (154)$	$- 29.29 ~ - 26.89 - 28.14 (5)$
崖城组	$- 45.45 ~ - 36.56 - 42.00 (398)$	$- 30.99 ~ - 27.19 - 28.70 (7)$

Table 2 天然气多组分碳同位素特征

Fig.3 A井钻遇天然气成因判识

Fig.4 BD21构造及周边井储层δ¹³C₁—干燥系数特征(松涛凸起、松南凹陷、松南低凸、陵水凹陷碳同位素及组分数据取自生产天然气,数据引自文献[7]、[8]、[13]、[21];其他数据来自同位素录井,皆为随钻泥浆气碳同位素数据。图5同)

Fig.5 BD21构造及周边井储层δ¹³C₁-δ¹³C₂特征

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