Oil & Gas Geology ›› 2022, Vol. 43 ›› Issue (5): 1049-1058.doi: 10.11743/ogg20220504

• Petroleum Geology • Previous Articles     Next Articles

Key factors and directions of exploration in the Cambrian pre-salt sequence, Tarim Basin

Haitao Lyu1,2(), Feng Geng1,2,3(), Kai Shang1,2   

  1. 1.Key Laboratory of Deep Geology and Resources,SINOPEC,Beijing 102206,China
    2.Northwest Branch Company,SINOPEC,Urumqi,Xinjiang 830011,China
    3.College of Geoscience and Surveying Engineering,China University of Mining and Technology (Beijing),Beijing 100083,China
  • Received:2022-01-14 Revised:2022-06-28 Online:2022-10-01 Published:2022-09-02
  • Contact: Feng Geng E-mail:lvht.xbsj@sinopec.com;dif.xbsj@sinopec.com

Abstract:

The Cambrian pre-salt sequence has been an important strategic successor play for oil and gas exploration with the greatest exploration potential in the Tarim Basin. However, no significant discoveries have been made for the past many years, with some key problems yet to be solved. Based on the summary and review of the achievements of key exploration wells in the Cambrian in the Tarim Basin, the conditions of hydrocarbon accumulation in the Cambrian pre-salt sequence are recognized, while pointing out the play fairways for exploration and the directions for research in the near future. The study shows that the Cambrian pre-salt sequence in the Tarim Basin is of better geological conditions for hydrocarbon accumulation such as source rocks, reservoirs and cap rocks, but there are differences in the configuration of play elements in different zones. Generally speaking, there are two hydrocarbon accumulation patterns in the pre-salt sequence, namely the “accumulation via vertical migration of hydrocarbons from indigenous source rocks” and the “accumulation via lateral migration of hydrocarbons from allochthonous source rocks”. It is pointed out that the Tazhong Uplift facing Manjiaer Sag, the Selibuya-Haimiluosi-Mazhatage structural belt facing Maigaiti Slope and the Akekule Salient of Tabei Uplift are the key areas for further exploration, and the key research directions are put forward respectively.

Key words: accumulation pattern, petroleum exploration, pre-salt sequence, Cambrian, Tarim Basin

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