准噶尔盆地西部坳陷二叠系下乌尔禾组烃源岩生烃潜力评价

doi:10.12108/yxyqc.20230402

Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (4): 16-28.doi: 10.12108/yxyqc.20230402

• PETROLEUM EXPLORATION • Previous Articles Next Articles

Hydrocarbon-generating potential of source rocks of Permian lower Urho Formation in western depression，Junggar Basin

TANG Yong¹, WANG Zhiqiang², PANG Yanqing³, DENG Shikun³, WANG Chao², HONG Penghui⁴

1. PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
2. No. 2 Oil Production Plant, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
3. Department of Reservoir Evaluation, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
4. Beijing Aonenghengye Energy Technology Co., Ltd., Beijing 100089, China

Received:2022-11-16 Revised:2023-03-24 Online:2023-07-01 Published:2023-07-01

Abstract

Abstract: The hydrocarbon-generating potential of Permian lower Urho Formation source rocks in western depression of Junggar Basin were systematically studied from lithology，organic matter characteristics，biomarker characteristics and distribution characteristics of large-scale effective hydrocarbon source stoves by means of RockEval pyrolysis，microexamination，thermal evolution analysis，thermal simulation experiment of hydrocarbon generation and basin modeling. The results show that：（1）The source rocks of lower Urho Formation in western depression are mainly mudstone deposits with inconspicuous laminae，and the lithologies include dark grey mudstone， grey silty mudstone，grey argillaceous silty mudstone，and grey carbonaceous silty mudstone.（2）The source rocks of lower Urho Formation have hydrocarbon-generating potential and its differences of samples is obvious， and the organic matters are mainly composed of type Ⅲ kerogen with the Rock-Eval hydrogen index（HI）generally less than 100 mg/g，which indicates a set of gas-prone source rocks. The maturities of organic matters vary widely with the vitrinite reflectance（R_o）ranging from 0.64% to 1.56%（1.06% on average）and the production index （PI）ranging from 0.05 to 0.74（0.33 on average）. At present，the source rocks in Shawan，Pengyijingxi and Mahu sags are in the late oil-generating-peak，condensate/wet-gas-generating stage，and dry-gas-generating stage，respectively. The abundance and hydrocarbon-generating potential vary greatly with the TOC ranging from 0.29% to 9.16%（0.85% on average）and S₁+S₂ ranging from 0.29 to 3.16 mg/g（0.74 mg/g on average），respectively. Poor and medium-good source rocks account for 50% of the total samples respectively.（3）The source rocks of lower Urho Formation were deposited in fresh-oxidized environment，mainly with terrigenous organic matter input and almost no carbonate input. The lithology and sedimentary environment are different from that of the source rocks of Fengcheng Formation，and the hydrocarbon generation potential is lower.（4）The hydrocarbon generation center of the source rocks of lower Urho Formation is located in western well Pen-1 sag，which has a large development scale. The area of the source rocks with a thickness greater than 100 m is 16 000 km²， and the area of the source rocks with a hydrocarbon generation intensity greater than 500×10⁴ t/km² is 6 800 km²，showing a favorable potential to form large and medium-sized oil and gas fields.

Key words: hydrocarbon-generating potential, source rock, thermal simulation of hydrocarbon generation, lower Urho Formation, Permian, western depression, Junggar Basin

CLC Number:

TE122.1

TANG Yong, WANG Zhiqiang, PANG Yanqing, DENG Shikun, WANG Chao, HONG Penghui. Hydrocarbon-generating potential of source rocks of Permian lower Urho Formation in western depression，Junggar Basin[J].Lithologic Reservoirs, 2023, 35(4): 16-28.

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Hydrocarbon-generating potential of source rocks of Permian lower Urho Formation in western depression，Junggar Basin

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