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    Volume 48 Issue 2
    Feb.  2023
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    Article Navigation >  Earth Science  > 2023  >  48(2): 517-532
    Song Zezhang, Ge Bingfei, Wang Wenzhi, Tian Xingwang, Zhu Guangyou, Yang Dailin, Zhang Baoshou, 2023. Quantitative Characterization of Ultra-Deep Paleo-Oil Reservoirs and Its Indication for Deep Gas Accumulation: A Case Study on the Dengying Formation, the North Slope of Central Sichuan Paleo-Uplift. Earth Science, 48(2): 517-532. doi: 10.3799/dqkx.2023.030
    Citation: Song Zezhang, Ge Bingfei, Wang Wenzhi, Tian Xingwang, Zhu Guangyou, Yang Dailin, Zhang Baoshou, 2023. Quantitative Characterization of Ultra-Deep Paleo-Oil Reservoirs and Its Indication for Deep Gas Accumulation: A Case Study on the Dengying Formation, the North Slope of Central Sichuan Paleo-Uplift. Earth Science, 48(2): 517-532. doi: 10.3799/dqkx.2023.030
    shu

    Quantitative Characterization of Ultra-Deep Paleo-Oil Reservoirs and Its Indication for Deep Gas Accumulation: A Case Study on the Dengying Formation, the North Slope of Central Sichuan Paleo-Uplift

    doi: 10.3799/dqkx.2023.030
    • 1.

      State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China

    • 2.

      College of Geosciences, China University of Petroleum, Beijing 102249, China

    • 3.

      Exploration and Development Research Institute, Petro China Southwest Oil & Gas Field Company, Chengdu 610051, China

    • 4.

      PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China

    • Received Date: 2023-01-22
    • Publish Date: 2023-02-25
      Abstract
    • The quantitative characterization of deep and ultra-deep hydrocarbon accumulation across multiple tectonic periods is one of the major sticking points in geoscience. The Dengying natural gas reservoirs of Upper Sinian in Central Sichuan are dominated by typical oil-cracking gas, and the hydrocarbon evolution has experienced a complex process from paleo-oil-reservoirs, paleo-gas reservoirs to today's gas reservoirs. The quantitative description of paleo-oil-reservoirs is the key and core to restore its hydrocarbon accumulation process. In this paper, the Dengying gas reservoirs of Upper Sinian in the North Slope of the central Sichuan paleo-uplift is selected as the research object, the solid bitumen is taken as the medium, based on core description, the solid bitumen is quantitatively evaluated in three dimensions from "point" (quantitative evaluation of solid bitumen by image-processing method), "line" (quantitative evaluation of solid bitumen by logging interpretation on multi-mineral inversion) to "plane" (quantitatively evaluate the plane distribution of solid bitumen), then quantitatively evaluated the paleo-oil-reservoirs and their resources by volume method, to provide support for the evaluation of natural gas exploration potential in the slope area from the perspective of hydrocarbon accumulation mechanism. The results show that: (1) Solid bitumen in the Dengying Formation mainly exists in the pore space in the state of semi-filling to full-filling. Generally, the solid bitumen content of the second member of the Dengying Formation is higher than that of the fourth member. Also, the solid bitumen content in the upper sub-member is slightly higher than that in the lower sub-member, no matter in the second member or the fourth; (2) The vertical and horizontal distribution of solid bitumen indicate that: in the vertical direction, the oil charging direction is mostly from top to bottom; while on the plane, there are two main directions for oil charging: from Deyang-Anyue rift trough to the inner side of the platform; lateral charging from the northern slope area to south, to the high part of the paleo-uplift; (3) The paleo-oil-reservoirs of Dengying Formation in the North Slope completed cracking earlier than the large-scale regional tectonic movement. Therefore, the content and distribution of solid bitumen in the reservoirs can be used to quantitatively describe the paleo-oil-reservoirs. The identification standard of paleo-oil-reservoirs is: the filling degree of solid bitumen in pore space is greater than 25% and the of solid bitumen content is greater than 2%; (4) Based on the distribution of mound and beach body on the platform-edge in the slope area, this study quantitatively depicted 5 reliable paleo-oil-reservoirs and 4 potential paleo-oil-reservoirs in North Slope of the central Sichuan Uplift. The scale of the paleo-oil-reservoirs obtained by volume method is about 177.25 × 108 t, and a complete cracking can produce oil-cracking gas of about 109 893.94 × 108 m3.

       

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