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近年来随着地质工作的不断深入,在乌伦古坳陷发现丰富的油气资源。然而与盆地其余地区相比,其油气勘探开发程度仍较低。本文通过构造特征和断裂发育过程对乌伦古坳陷油气成藏规律进行了系统研究。研究区发育3套烃源岩,其中石炭系滴水泉组和巴塔玛依内山组烃源岩最为重要,索索泉凹陷中心为乌伦古坳陷的石炭系烃源岩生油中心。乌伦古坳陷油气藏的形成受控于逆冲断裂而呈带状分布,是逆冲断裂控制的油气聚集带。断裂活动自北往南变新,断裂活动期次与烃源岩生烃高峰期相匹配,沟通油源的深大断裂是油气运移的主要通道。浅部发育反冲断层,主要分布在斜坡区的喀拉萨伊断裂附近,对早期油气起到破坏作用。研究区断裂系统在平面上自北往南可分为根部带、中部带和前锋带,受断裂活动影响,构造圈闭和油气藏形成时期逐渐变新,层位逐渐变浅,类型由断层相关变为褶皱相关。
In recent years, with the continuous deepening of geological work, abundant oil and gas resources have been found in the Wulungu Depression. However, compared with the rest of the basin, the degree of oil and gas exploration and development is still relatively low. In this paper, we systematically studied the hydrocarbon accumulation in Wulungu Depression by tectonic features and fault development process. Three sets of source rocks are developed in the study area. Among them, the source rocks of the Carboniferous Dioshuiquan Formation and the Batamayi Neishan Formation are the most important. The center of the Soxhuanquan sag is the oil-producing center of the Carboniferous source rock in the Wulungu Depression. The formation of the reservoir in Wulungu Depression is controlled by thrusting and belt-like distribution, which is a hydrocarbon accumulation zone controlled by thrusting. The fault activity changed from north to south, and the fault activity period matched with the peak period of hydrocarbon generation. The deep fault that communicated oil source is the main channel of hydrocarbon migration. The shallow-developed thrusts are mainly distributed in the vicinity of the Kara-Saya fault in the slope area, and have a damaging effect on the earlier oil and gas. The fracture system in the study area can be divided into root belt, middle belt and forward belt in the plane from north to south in the plane. Affected by the fault activity, the structural trap and oil-gas accumulation period gradually become new, and the layers gradually become shallow. The types are fault-related Become fold related.