琼东南盆地松南-宝岛凹陷北部断阶带油气来源与成藏时间

李兴; 尤丽; 詹冶萍; 江汝峰; 邓孝亮; 胡斌

doi:10.3799/dqkx.2023.131

Volume 48 Issue 8

Aug. 2023

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Article Navigation > Earth Science > 2023 > 48(8): 3007-3020

Li Xing, You Li, Zhan Yepin, Jiang Rufeng, Deng Xiaoliang, Hu Bin, 2023. A Study on Hydrocarbon Sources and Accumulation Time in the Northern Fault Zone, Songnan-Baodao Sag of Qiongdongnan Basin. Earth Science, 48(8): 3007-3020. doi: 10.3799/dqkx.2023.131

Citation:

Li Xing, You Li, Zhan Yepin, Jiang Rufeng, Deng Xiaoliang, Hu Bin, 2023. A Study on Hydrocarbon Sources and Accumulation Time in the Northern Fault Zone, Songnan-Baodao Sag of Qiongdongnan Basin. Earth Science, 48(8): 3007-3020. doi: 10.3799/dqkx.2023.131

Citation:

Li Xing, You Li, Zhan Yepin, Jiang Rufeng, Deng Xiaoliang, Hu Bin, 2023. A Study on Hydrocarbon Sources and Accumulation Time in the Northern Fault Zone, Songnan-Baodao Sag of Qiongdongnan Basin. Earth Science, 48(8): 3007-3020. doi: 10.3799/dqkx.2023.131

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A Study on Hydrocarbon Sources and Accumulation Time in the Northern Fault Zone, Songnan-Baodao Sag of Qiongdongnan Basin

doi: 10.3799/dqkx.2023.131

Hainan Branch of CNOOC Ltd., Haikou 570100, China

Received Date: 2022-11-19
Publish Date: 2023-08-25

Abstract

Abstract

A number of gas-bearing structures were discovered in the northern fault zone of Songnan-Baodao Sag in Qiongdongnan Basin, but great disputes on the understanding of hydrocarbon source in the northern fault zone, the research on the scale of source rocks in deep-water is still weak, which hindered the decision of the next exploration direction. A total of 84 mudstone, 7 natrual gases, 3 crudoil samples from the study area were collected for rock pyrolysis, kerrogen carbon isotope, biomarkers, light hydrocarbon and carbon isotope analysis of natural gas in this paper, Geochemical characteristics of source rock from different strata in the study area systematic comparison, it is believed that the oil and gas in the norhern fault-step zone of Songnan-Baodao depression derived from marine mudstone of yacheng formation, and land-based organic hydrocarbon generation is dominant, combined with the paleoenvironment paleontology and microscopic components analysis, it is predicted that the whole yacheng formation is a shallow sea sedimentary environment, and conductive to the enrichment of organic matter form good source rocks, On this basis, the distribution characteristics of hydrocarbon source rocks of the yacheng formation in the study area are clarified through the seismic facies. The results show that the yacheng formation in the study area develop a large-scale coal-bearing delta、marine sedimentary system, which is the main occurrence unit of good hydrocarbon source rocks, distributed along the near concave and fault step zone. Fluid inclusion evidence shows that there are at least two stages of hydrocarbon filling in the deep-water area of the northern fault step zone of Songnan-Baodao depression, and the main accumulation is the high mature coal-type gas. It is confirmed that source rocks deposited on the coal-bearing delta and marine facies have rich gas supply, and a large amount of natural gas will be easier generated in the later stage, it is speculated that there are similar source rock distribution, thermal evolution characteristics and transport system in the fault step zone of deep-water area on the east side, which should be the first choice for next natural gas exploration.
- Songnan-Baodao Depression,
- northern fault zone,
- marine source rock,
- coal-bearing delta,
- land-based organic,
- petroleum geology

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A Study on Hydrocarbon Sources and Accumulation Time in the Northern Fault Zone, Songnan-Baodao Sag of Qiongdongnan Basin

doi: 10.3799/dqkx.2023.131

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