Tectonic Characterization and Sedimentary Microphase Control Mechanism in The Sweet Spot of Chang7 Shale Reservoir in Qingcheng Oilfield

The long 7 shale oil reservoir in Qingcheng Oilfield is one of the important shale oil resources in Ordos Basin, and its sweet spot plays a key role in the formation and distribution of hydrocarbon reservoirs. Through the systematic analysis of the tectonic features and sedimentary microphase of the Qingsheng Oilfield Chang7 Shale Reservoir, this paper discusses the reservoir control mechanism of the sweet spot zone, studies the tectonic background and evolution process of the zone, and reveals the overall tectonic complexity of the zone and the controlling effect of the local small tectonic units on the distribution of hydrocarbons. By analyzing the spatial distribution of sedimentary phase zones and sedimentary microphases, we focus on the influence of different sedimentary phase types on the oil and gas rich areas, especially the key role of waterway sands and turbidite deposits in the dessert zone. Combined with reservoir characteristics and reservoir control factors, this paper analyzes the hydrocarbon enrichment mechanism of the sweet spot zone and predicts its potential in future development. The study shows that the tectonic and sedimentary microphase characteristics of the sweet spot zone of the Qincheng Oilfield Long 7 Shale Reservoir closely affect the distribution and storage of hydrocarbons, and it has a large potential for development. The research in this paper provides theoretical support and practical basis for the exploration and development of the Long 7 shale reservoir.