Oil & Gas Geology ›› 2022, Vol. 43 ›› Issue (1): 105-117.doi: 10.11743/ogg20220109

• Petroleum Geology • Previous Articles     Next Articles

Characterization and petroleum geological significance of deep igneous intrusions and related structures in the Shunbei area, Tarim Basin

Yuqing Liu1(), Shang Deng1,2, Rong Zhang2, Jun Liu2, Cheng Huang2, Tian Gao3   

  1. 1.Petroleum Exploration and Development Research Institute,SINOPEC,Beijing 100083,China
    2.Northwest Oilfield Company,SINOPEC,Urumqi,Xinjiang 830011,China
    3.School of Energy Resources,China University of Geosciences (Beijing),Beijing 100083,China
  • Received:2020-11-16 Revised:2021-12-09 Online:2022-02-01 Published:2022-01-28

Abstract:

The magma intrusion in the Shunbei area, Tarim Basin, is investigated based on newly acquired 3D seismic data. The igneous intrusions and related structures in the area are characterized and mapped in detail to establish a vertical intrusion model, determine lateral flow direction of magma, and reveal their petroleum significance. The igneous intrusions are saucer-shaped and distribute along the top boundary of the Lower-Middle Ordovician and the boundaries of strata above it in layered superimposition. Reverse faults and steep fractures occur above the saucer-shaped sills, leading to a vertical magma intrusion model of “magma pathway-superimposed sills-steep structure”. The actual distribution of the sills and related structures reveal that the magma in this area fisrt intruded from the deep to the top of the Middle-Lower Ordovician and then flew laterally from north to south in a radial pattern. All these suggest that igneous intrusions play a role in improving reservoir quality and the related reverse faults are the pathways for hydrocarbon to migrate. A deeper understanding of the sills and related structures can be a better guidance for oil and gas exploration in the Shunbei area or even the whole Tarim Basin.

Key words: reverse fault, steep fracture, igneous intrusion, Shunbei area, Tarim Basin

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