准噶尔盆地上二叠统风险领域分析与沙湾凹陷战略发现

doi:10.3969/j.issn.1672-7703.2019.01.004

摘要/Abstract

摘要： 从玛湖大油区上二叠统成藏特点和油气分布规律入手，明确了3种类型油气藏有序分布规律，建立地层背景下广覆式退积型扇三角洲源上大面积成藏模式。首次统一准噶尔盆地二叠系东西部地层系统，通过石油地质条件类比研究，发现了面积超过2.5×10⁴km²的中央坳陷上二叠统中组合石油重大接替领域。在古地貌控沉控砂交互分析基础上，认为上二叠统受沟槽体系控制，在地层超覆背景下发育八大扇三角洲沉积，为此确定四大勘探领域和十大有利区带成藏条件优越，具备整体勘探条件。沙湾凹陷西斜坡是油气长期汇聚成藏的有利指向区，其上乌尔禾组、百口泉组发育扇三角洲前缘相带有利储层，物性较好，岩性圈闭群数量多、面积广，资源量大且勘探程度低，具有多层系立体成藏的特点，是风险勘探的重大领域。为此2018年优选沙湾凹陷西斜坡地层背景下岩性油藏群作为突破口，部署沙探1井，获重大发现，展现出与玛湖凹陷类似的多层系立体勘探潜力，有望与玛湖大油区连片，形成又一个勘探大场面。

关键词: 沙湾凹陷, 风险领域, 发现意义, 准噶尔盆地, 上二叠统

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

中图分类号:

杜金虎, 支东明, 唐勇, 贾春明, 徐洋, 阿不力米提·依明, 邓勇. 准噶尔盆地上二叠统风险领域分析与沙湾凹陷战略发现[J]. 中国石油勘探, 2019, 24(1): 24-35.

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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