New understanding of oil and gas geochemical characteristics and origin of Yacheng 13-1 Gas Field in Qiongdongnan Basin
Received date: 2023-06-07
Revised date: 2023-08-18
Online published: 2023-10-26
Supported by
The Major Science and Technology Project of the 14th Five Year Plan of CNOOC(KJGG2022-0404)
Recently， the first self-operated well in the buried hill field was drilled around Yacheng 13-1 Gas Field， and the commercial discovery made the gas field glow with new vitality. In order to further explore the exploration value of Yacheng 13-1 structure， it is necessary to clarify its source of oil and gas for realizing the resource potential of the area. Based on the analysis and test data of new and old drilling samples， starting from the geochemical characteristics of oil and gas， this paper carefully analyzes the genetic types and distribution rules of oil and gas in Yacheng 13-1 Gas Field， and defines the source of oil and gas. The analysis shows that the natural gas in Yacheng 13-1 Gas Field is coal type gas， and the natural gas and condensate in the south and north blocks are obviously different. The dryness coefficient of natural gas is “dry in the north and wet in the south”， the carbon isotope of hydrocarbon gas is “heavy in the north and light in the south”， and the maturity is “high in the north and low in the south”. The density， viscosity， freezing point and wax content of the condensate in the north block are higher than those in the south block， and the aromatics content and planting ratio of the condensate in the north block are also significantly higher than those in the south block. This difference is mainly related to the composition and maturity of oil and gas parent materials. In the north block， the input of terrigenous hydrocarbon source materials is more， and the contribution of lower aquatic organisms in the south block is increased. Further oil source correlation shows that the oil and gas in the north block of Yacheng 13-1 Gas Field has the characteristics of “double sources”， with contributions from both the local coal measures source rocks of Yacheng Formation in the north block and the Oligocene source rocks of Yinggehai Sag. The oil and gas in the south block mainly comes from the terrigenous marine facies sapropelic source rocks of the Yacheng Formation in the Yanan Depression.
Ziling WANG , Xiaohu HE , Xiaoliang DENG , Gang LIANG , Xiaoxiao GUO . New understanding of oil and gas geochemical characteristics and origin of Yacheng 13-1 Gas Field in Qiongdongnan Basin[J]. Natural Gas Geoscience, 2024 , 35(6) : 1061 -1069 . DOI: 10.11764/j.issn.1672-1926.2023.08.006
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