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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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

Received: 01 April 2022 Published: 16 April 2024

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	Articles by authors
	Yi-Tao HU
	Huan-Xu ZHANG
	Peng-Bo NI
	Wei HAO
	Yu-Yang QU
	Han-Li XIAO

Cite this article:

Yi-Tao HU,Huan-Xu ZHANG,Peng-Bo NI, et al. Application of multi-component carbon isotope logging in natural gas exploration: A case study of the BD21 area, Qiongdongnan Basin[J]. Geophysical and Geochemical Exploration, 2024, 48(2): 348-355.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.2158 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I2/348

Verification report of carbon isotope measurement

Well location in Qiandongnan Basin

Multicomponent carbon isotope profiles

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	$- 45.45 ~ - 36.56 - 42.00 (398)$	$- 30.99 ~ - 27.19 - 28.70 (7)$

Multicomponent carbon isotope characteristics of natural gas

Natural gas origin identification of well A

7], [8], [13], [21]. Other data are derived from isotopic logging and are all carbon isotope data of mud gas while drilling. Same as in Fig.5)
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δ¹³c₁-drying values of multi-well reservoir in fault in BD21(The carbon isotope and component data of Songtao bulge,Songnan Sag, Songnan low bulge and Lingshui sag were obtained from natural gas production, and the data were cited from references [7], [8], [13], [21]. Other data are derived from isotopic logging and are all carbon isotope data of mud gas while drilling. Same as in Fig.5)

δ¹³C₁~δ¹³C₂values of multi-well reservoir in BD21

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