Prospects in Upper Permian and strategic discovery in Shawan sag, Junggar Basin

doi:10.3969/j.issn.1672-7703.2019.01.004

Abstract

Abstract: According to the hydrocarbon accumulation characteristics and hydrocarbon distribution laws of Upper Permian in the Mahu oil region, the distribution of three types of oil and gas reservoirs were clarified, and the pattern of large-scale hydrocarbon accumulation above the source rock of extensive retrograding fan delta in the stratigraphic setting was established. It was the first time that the Permian stratigraphic systems in the east and west of the Junggar Basin were unified. By petroleum geological analog, a significant petroleum replacement field with the area over 2.5×10⁴ km² was discovered in the middle assemblage in Upper Jurassic of the Central depression. The controlling of palaeogeomorphology on sedimentation and sand was analyzed interactively, and it is indicated that the Upper Permian is controlled by groove systems and 8 major deposits of fan deltas are developed in the setting of stratigraphic overlap. Thus, it is confirmed that 4 major exploration fields and 10 favorable zones are good in hydrocarbon accumulation conditions, and they satisfy the conditions of overall exploration. The west slope of Shawan sag is a favorable destination of long-term hydrocarbon accumulation. In the Upper Wuerhe Formation and Baikouquan Formation, there are favorable reservoirs of fan delta front facies, with good physical properties. There are a great number of broad lithologic trap groups, with abundant resources and low exploration degree. It is revealed that the west slope is a major field of risk exploration with the characteristics of multi-layer stereo hydrocarbon accumulation. In 2018, the lithologic oil reservoir group in the stratigraphic setting of west slope was selected as the breakthrough point for exploration, where Well Shatan 1 was deployed. The significant discovery demonstrates the potential of multi-layer stereo exploration, similar to that in the Mahu sag. And it is expected to be connected with Mahu oil region, forming an other great exploration area.

Key words: Junggar Basin, Upper Permian, Shawan sag, prospect, significance of discovery

CLC Number:

Du Jinhu, Zhi Dongming, Tang Yong, Jia Chunming, Xu Yang, Abulimity·Yiming, Deng Yong. Prospects in Upper Permian and strategic discovery in Shawan sag, Junggar Basin[J]. China Petroleum Exploration, 2019, 24(1): 24-35.

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