Natural Gas Geoscience ›› 2023, Vol. 34 ›› Issue (1): 96-110.doi: 10.11764/j.issn.1672-1926.2022.09.008

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Quantitative simulation of phase evolution for ultra-deep oil and gas from Lower Cambrian strata of Well Luntan-1 in the Tarim Basin

Chengsheng CHEN1,2(),Rui DENG1,2,Haizu ZHANG3,Yunpeng WANG1,2()   

  1. 1.State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences(CAS); CAS Center for Excellence in Deep Earth Science,Guangzhou 510640,China
    2.Research Institute of Petroleum Exploration and Development,PetroChina Tarim Oilfield Company,Korla 841000,China
  • Received:2022-07-15 Revised:2022-09-24 Online:2023-01-10 Published:2023-02-07
  • Contact: Yunpeng WANG E-mail:chenchengsheng14@mails.ucas.ac.cn;wangyp@gig.ac.cn
  • Supported by:
    The Strategic Priority Research Program of the Chinese Academy of Sciences(XDA14010103);the National Natural Science Foundation of China(42273053)

Abstract:

Well Luntan-1 (LT-1), located in the Lunan Low-uplift of Tabei Uplift, the Tarim Basin, drilled and revealed the high-quality source rocks of Lower Cambrian Yuertusi Formation, and successfully found ultra-deep light oil and gas in the 8260-meter-deep dolomite reservoirs of Wusongar Formation. It shows a good prospect for ultra-deep oil and gas exploration in the platform of Tarim Basin. Previous research shows that the light oil from Well LT-1 is mainly derived from the Cambrian source rocks, however, there has been no systematic study on the generation history of the source rocks as well as the phase characteristics and physical properties of the generated oil and gas. In this paper, we quantitatively simulated the hydrocarbon generation history and its staged phase characteristics of the Yuertusi source rocks in Well LT-1 using a combined method of basin modeling and phase simulation after selecting an appropriate phase kinetic model. Then, we predict the generation stage of the light oil from the Wusongar dolomite reservoirs by comparing the real and the modeled phase-physical properties. The results show that the Yuertusi source rocks of Well LT-1 mainly generated normal oils in the Late Caledonian-Early Hercynian period, with low gas-oil ratios but high viscosity and density. The light oil-condensates were generated in the Yanshan-Himalayan period with much higher gas-oil ratios (GORs) but lower viscosity and density. The phase characteristics and physical properties of the light oil from the Wusongar dolomite reservoirs have coincided with the hydrocarbon fluids generated by the Yuertusi source rocks during Late Himalayan period. Comprehensive analysis shows that the light oil in Well LT-1 was derived from the Yuertusi source rocks at the stage of very closed condition and specific thermal maturation (1.00%<RO<1.50%), further supporting that specific geological and thermal conditions are the key to form light oils in source rocks. The drilling of Well LT-1 in the Tarim Basin further verified the good resource potential of Yuertusi source rocks and confirmed a good prospect of the deep and ultra-deep exploration for light oil and gas in the basin.

Key words: Well Luntan-1 (LT-1), Yuertusi Formation, Light oil, Phase simulation, Basin modeling

CLC Number: 

  • TE122.1

Fig.1

Geological background of Tarim Basin and the study area"

Fig.2

Kinetic parameters (activation energy distribution and frequency factor A) adopted in this paper"

Fig.3

The burial history of Well Luntan-1 overlapped with temperature-maturity mappings,and the model calibration results"

Fig.4

The generation history of Yuertusi Formation source rocks in Well Luntan-1"

Fig.5

Phase diagrams and physical characteristics of generated hydrocarbons during the maturation of Yuertusi Formation source rocks from Well Luntan-1 under the open system (Late Cambrian-Early Hercynian)"

Fig.6

Phase diagrams and physical characteristics of generated hydrocarbons during the maturation of Yuertusi Formation source rocks from Well Luntan-1 under the open system (Yanshanian-Himalayan)"

Fig.7

Phase diagrams and physical characteristics of generated hydrocarbons during the maturation of Yuertusi Formation source rocks from Well Luntan-1 under the closed system (Yanshanian-Himalayan)"

Fig.8

Critical point of hydrocarbon fluid(a) and evolution characteristics(b) of maximum condensate temperature and pressure in open and closed systems"

Fig.9

Comparison between open and closed systems for physical characteristics of generated hydrocarbons upon the ground (0.101 MPa,20 ℃)"

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