Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (6): 122-134.doi: 10.12108/yxyqc.20240612

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Characteristics of Cretaceous source rocks and their controlling effect on hydrocarbon accumulation in Dehui Fault Depression，Songliao Basin

QU Weihua1, TIAN Ye2, DONG Changchun3, GUO Xiaobo4, LI Lili3, LIN Siya4, XUE Song3, YANG Shihe5   

  1. 1. Department of Exploration, Jilin Oil Field Company, PetroChina, Songyuan 138000, Jinlin, China;
    2. Digital Intelligence Technology Company of Jilin Oil Field, Songyuan 138000, Jinlin, China;
    3. School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    4. Exploration and Development Research Institute of Jilin Oil Field Company, PetroChina, Songyuan 138000, Jinlin, China;
    5. Research Institute of Geological, China National Logging Corporation, Xi'an 710077, China
  • Received:2024-01-30 Revised:2024-04-03 Online:2024-11-01 Published:2024-11-04

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Abstract: Based on experimental analysis of source rock，gas and reservoir fluid inclusions，we systematically study the geochemical properties，development environment，origin and source of natural gas，hydrocarbon accumulation period and reservoir control function of the Cretaceous source rock in the Dehui fault depression， Songliao Basin. The results show that：（1）The TOC of Cretaceous source rocks in Dehui fault Depression is generally greater than 1%，the organic matter types are mainly type Ⅲ，and type Ⅱ samples are mainly distributed in Non gannan Depression，which is generally in the mature to high mature stage of abundant gas；The source rocks of Huoshiling Formation and Yingcheng Formation were formed in the depositional environment of reduction-weak reduction and high-water salinity，and the lower biogenic sources such as plankton and algae contributed more in the source rocks of Huoshiling Formation in Nongannan Depression，and the oil generation capacity was stronger. （2）The composition of cretaceous natural gas varies greatly，with alkane gas ranging from 2.0% to 98.5% and CO2 content ranging from 0.1% to 96.5%；The main type of gas is coal-derived gas，and some gas samples show signatures of carbon isotope inversion because of secondary gas charging at different epochs. In the Guojia Depressions，Huajia Depressions and Nongannan Depressions，the hydrocarbon-bearing rocks are mainly the Huoshiling Formation. The gas in the Baojia Sink probably comes primarily from the source rock of the Zhuocheng For mation. The genetic type of CO2 gas is predominantly inorganic. As the burial depth increases，the carbon isotopic composition of the carbonate cement shows a positive shift，indicating the risk of drilling deep into the highly inorganic CO2 gas layer.（3）The source rocks in Nongannan Depression are in the stage of oil generation. From the south to the north，the thermal evolution degree of the source rocks increases gradually，which controls the phase distribution of“oil from the south to the north”and controls the hydrocarbon accumulation period. Industrial oil and gas wells are mainly located near the center of the high thick source rock，which controls the distribution of oil and gas reservoirs.

Key words: alkane, CO2, source rock, gas-source comparison, accumulation period, coal gas, Huoshiling For mation, Yingcheng Formation, Cretaceous, Dehui Fault Depression, Songliao Basin

CLC Number: 

  • TE121
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