Exploration prospects of the whole oil and gas system in the Permian hydrocarbon depression in the Eastern Junggar Basin

Abstract: [Objective] Multiple types of oil reservoirs, including conventional oil, tight oil, and shale oil, have been discovered in the Jimusaer Depression from the slope area to the depression area, demonstrating the characteristics of conventional unconventional ordered coexistence and complete oil and gas system accumulation. [Methods] In order to explore the rules of oil and gas accumulation in other hydrocarbon rich depressions in the Eastern Junggar, through the study of source rocks, sedimentary reservoirs, and reservoir formation, [Results] it is believed that: high-quality saline lacustrine facies source rocks are developed in the Middle Permian of the Eastern Junggar. The source rocks in the Jinan, Jimusaer, and Shishugou depressions are of large scale and best quality, and have reached the stage of mature evolution; The inherited ancient uplifts around the Permian hydrocarbon rich depression provide long-term material sources, with the development of fan deltas, braided river deltas, and saline lake sediments, forming sand conglomerates, cloudy sandstones, cloudy mudstones, etc. in an orderly manner, with the characteristics of grain sequence reservoir formation; From the edge of the basin to the depression area, conventional oil and gas reservoirs, tight oil and gas, and shale oil and gas accumulations are developed, with a complete type of reservoir formation and a complete oil and gas system development pattern. [Conclusions] The depressions in the Eastern Junggar Basin show whole oil and gas system pattern. [Significance] Under the guidance of the entire oil and gas system reservoir formation model, the southern slope of the Shishugou sag and the Lucaogou Formation of the Jinan sag are selected as important exploration zones for future exploration in the Eastern Junggar.