准噶尔盆地永进地区油气藏成藏条件及其主控因素研究

Study on Reservoir Forming Conditions and Main Controlling Factorsof Oil and Gas Reservoirs in Yongjin Area of Junggar Basin

【目的】通过对永进地区油气藏成藏条件及主控因素展开分析,旨在为该区进一步勘探提供理论依据。【方法】以侏罗系齐古组为目的层,通过分析成藏条件,明确主控因素,研究沉积微相及断裂对油气藏成藏的控制作用。【结果】研究区烃源岩主要来自二叠系,在浅水三角洲沉积背景下,发育大套连续的厚度大、物性好的储层,在此之上发育较为稳定的盖层,保存条件良好。研究区经多期构造运动形成多组通源断裂,喜山期形成封堵断层,构造圈闭条件较好;断裂构造和倾斜的储层砂体为油气提供了良好的垂向和横向运移通道。【结论】沉积演化和走滑断层控制齐古组成藏模式,应重点寻找永进地区构造-岩性油气藏。研究成果为该地区进一步勘探指明了方向。

[Purposes]Through the analysis of the accumulation conditions and main controlling factors of oil and gas reservoirs in Yongjin area,the purpose is to provide theoretical basis for further exploration in this area.[Methods]In this paper,the Jurassic Qigu Formation is taken as the target layer.By analyzing the accumulation conditions,the main controlling factors are clarified,and the control of sedimentary mi-crofacies and faults on oil and gas accumulation is studied.[Findings]The results show that the source rocks in the study area are mainly from the Permian.Under the background of shallow water delta deposi-tion,a large set of continuous reservoirs with large thickness and good physical properties are developed.On this basis,a relatively stable cap rock is developed and the preservation conditions are good.The study area has formed multiple sets of source-connecting faults through multi-stage tectonic movements,and formed sealing faults in the Himalayan period,and the structural trap conditions are good.The fault structure and inclined reservoir sand bodies provide good vertical and lateral migration channels for oil and gas.[Conclusions]Sedimentary evolution and strike-slip faults control the accumulation model of Qigu Formation,and the focus should be on finding structural-lithologic reservoirs in Yongjin area.The research results have pointed out the favorable direction for further exploration in this area.