The genesis, accumulation model and exploration significance of Y gas field in X Sag, East China Sea Basin

Zhang Yingzhao; Hu Senqing; Chen Zhongyun; Cai Hua; Jiang Yiming; Diao Hui; Wang Chao

doi:10.12284/hyxb2022011

Volume 44 Issue 11

Nov. 2022

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Zhang Yingzhao，Hu Senqing，Chen Zhongyun, et al. The genesis, accumulation model and exploration significance of Y gas field in X Sag, East China Sea Basin[J]. Haiyang Xuebao，2022, 44(11)：88–98 doi: 10.12284/hyxb2022011

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The genesis, accumulation model and exploration significance of Y gas field in X Sag, East China Sea Basin

doi: 10.12284/hyxb2022011

1. Shanghai Branch Company of China National Offshore Oil Corporation (China) Ltd., Shanghai 200335 , China

Received Date: 2021-01-19
Rev Recd Date: 2021-06-05

Available Online: 2022-11-03

Publish Date: 2022-11-03

Abstract

Abstract

The purpose of this paper is to clarify the genesis of natural gas of Y gas field, and establish accumulation model to guide the next exploration deployment in X Sag, East China Sea Basin. Based on the analyses of natural gas composition, carbon isotope of alkane gas, light hydrocarbon and biomarker compound of condensate oil, this paper systematically studies the genetic types and sources of oil and gas, establishes the reservoir accumulation model of Y large and medium-sized gas field, and puts forward the exploration direction of large and medium-sized gas field. The analyses of carbon isotope, light hydrocarbon and burial history show that the natural gas in Y gas field is highly mature coal type gas generated by the source rocks of middle Eocene Pinghu formation in the sag during the Longjing movement period (13 Ma BP). The characteristics of pristane/phytane and regular sterane of condensate oil reflect that the source rocks of middle Eocene Pinghu formation in the central sag are developed in tidal flat and lagoon sedimentary environment with weak oxidation weak reduction, and there are a certain number of lower aquatic organisms in the hydrocarbon generating parent material. Y gas field has a spatiotemporal coupling reservoir accumulation model of “Pinghu formation source rock, Huagang formation large channel sand reservoir and Mid-Miocene compressional tectonism” in the central sag. It is clear that the compressional anticline belt in the central sag is the main exploration direction of large and medium-sized gas fields in X Sag.
- alkane gas carbon isotope,
- natural gas light hydrocarbon,
- condensate oil,
- natural gas genesis,
- accumulation model,
- exploration direction,
- Y gas field of X Sag in East China Sea Basin

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References

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