Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (3): 33-46.doi: 10.12108/yxyqc.20250304

• PETROLEUM EXPLORATION • Previous Articles    

Main controlling factors of hydrocarbon accumulation and enrichment of Jurissic Xishanyao Formation in Monan Slope，Junggar Basin

YIN Zhaopu, ZHU Feng, ZHOU Zhiyao, WANG Lili, LIU Xiaoye, Nazyman, WANG Yuting, HUANG Darui   

  1. Urumqi Branch, Geophysical Research Institute, BGP, CNPC, Urumqi 830000, China
  • Received:2025-01-06 Revised:2025-02-25 Published:2025-05-10

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Abstract: Based on drilling, logging，2D and 3D seismic，core analysis，well tie comparison and seismic inversion，the research of hydrocarbon reservoirs in Yongjin Oilfield of Jurissic Xishanyao Formation in Monan Slope of Junggar Basin was carried out. The main controlling factors of hydrocarbon accumulation and enrichment of Monan Slope were analyzed from perspectives of sequence stratigraphy，sedimentary system，trap conditions and transportation system，and favorable zones were predicted. The results show that：（1）Jurassic Xishanyao Formation in Monan Slope of Junggar Basin is a third-order sequence，which has undergone a process of progradationretrogradation.The red mudstone developed across time at the top boundary of Jurassic in Monan Slope is widely distributed throughout the area，and can be used as a regional cap rock.（2）The high-quality sand bodies are developed on large scale in the third member of Jurassic Xishanyao Formation.The beach sand in the inner leading edge and the shore-face sand bar in the outer leading edge of the wave-dominated delta are effective reserviors. The internal mudstone serves as the top and bottom plates，lake-bay mudstone laterally seals，providing a superior conditions for the development of lithologic traps.（3）The Indosinian-Yanshanian strike-slip faults connect deep oil sources and can serve as oil source faults. During the Himalayan，low-angle large-scale thrusting nappe faults horizontally developed and transported oil and gas upward，serving as favorable channels for hydrocarbon migration.（4）The intersection of the shore-face sand dam trap zones in the outer leading edge of the wave-dominated delta in the third member of Xishanyao Formation in the north of Monan Slope and the Dadonggou fault zones of Himalayan is favorable zone for further exploration.

Key words: wave-dominated delta, beach sand, shore-face sand dam, oil source fault, lithologic trap, Xishanyao Formation, Jurissic, Monan Slope, Junggar Basin

CLC Number: 

  • TE122.1+2
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