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2022 Vol. 49, No. 4
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Article navigation > Geology in China > 2022 > 49(4): 1275-1284
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FAN Saihua, XIE Hui, LI Binwen, LIU Yuan, LI Weiping, XU Weina, ZHAO Hu, MOU Lei. 2022. Controlling effect of Shaximiao Formation fault on gas accumulation in eastern slope area of Western Sichuan Depression[J]. Geology in China, 49(4): 1275-1284. doi: 10.12029/gc20220417
Citation: FAN Saihua, XIE Hui, LI Binwen, LIU Yuan, LI Weiping, XU Weina, ZHAO Hu, MOU Lei. 2022. Controlling effect of Shaximiao Formation fault on gas accumulation in eastern slope area of Western Sichuan Depression[J]. Geology in China, 49(4): 1275-1284. doi: 10.12029/gc20220417
shu

Controlling effect of Shaximiao Formation fault on gas accumulation in eastern slope area of Western Sichuan Depression

  • 1.

    Area of Operations of Luliang Oilfield of PetroChina Xinjiang Oil Field Company, Karamaym 834000, Xinjiang, China

  • 2.

    Research Institute of Experimental Detection, Xinjiang Oilfield Company, Karamaym 834000, Xinjiang, China

  • 3.

    Supervision Company of Xinjiang Oilfield Company, Karamaym 834000, Xinjiang, China

    • Fund Project: Supported by the project of "Key Technologies for the Development of Complex Tight Sandstone Gas Reservoirs in the Slope Belt of Western Sichuan Depression" (No.2016ZX05048-004) of National "13th Five-Year" Major Science and Technology Projects
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  • Author Bio: FAN Saihua, male, born in 1980, master candidate, associate senior researcher, mainly engaged in petroleum geology research; E-mail: 582233422@qq.com
Received Date:  11 January 2019
Revised Date:  27 October 2020
Publish Date:  25 August 2022
    Abstract

  • This paper is the result of oil and gas exploration engineering.

     Objective

    The exploration potential of conventional structural advantage area of gas reservoir in Jurassic Shaximiao Formation in the eastern slope of western Sichuan depression is not great, and the geological understanding of the gas reservoir in the complex fault clamping area with low degree of exploration is obviously lagging behind.

     Methods

    Based on the data in exploration and developent in recent years, using the theory of structural reservoir control, this paper studies the control of fault section morphology type and fluid potential difference on oil and gas accumulation, discusses the oil and gas distribution in the fault clamping area, and summarizes the difference of oil and gas enrichment in the north-south fault system.

     Results

    The study shows that the river channel controlled by slope-flat fault has a high degree of oil and gas filling, which is conducive to high-efficiency reservoir formation, followed by low-angle shovel-like fault, and high-angle flat shovel-like fault has the worst reservoir formation.

     Conclusions

    Fluid potential difference makes it difficult for hydrocarbon source cliff gas to fill long-distance sand bodies through high potential areas. Although it is difficult to form reservoirs due to the escape of oil and gas in the development of a narrow fracture network at both ends of the fracture clamping area, a relatively good oil and gas enrichment zone can be formed in the wider middle if the slope-flat fault and low-angle shovel-like fault are clamped and transported together.Therefore, it is believed that the structure in the south is superior to that in the northern and central clamping areas and has certain potential. The key factors of reservoir formation are still controlled by the fracture morphology and transportation capability.
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