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Overpressure origin and its effects on petroleum accumulation in the conglomerate oil province in Mahu Sag, Junggar Basin, NW China
Petroleum Exploration and Development ( IF 7.5 ) Pub Date : 2020-08-21 , DOI: 10.1016/s1876-3804(20)60088-x
Jun LI , Yong TANG , Tao WU , Jingzhou ZHAO , Heyuan WU , Weitao WU , Yubin BAI

The origin of overpressure and its effect on petroleum accumulation in the large Permian/Triassic conglomerate oil province in the Mahu Sag, Junggar Basin have been investigated based on comprehensive analysis of log curve combinations, loading-unloading curves, sonic velocity-density cross-plot, and porosity comparison data. The study results show that there are two kinds of normal compaction models in the study area, namely, two-stage linear model and exponent model; overpressure in the large conglomerate reservoirs including Lower Triassic Baikouquan Formation and Permian Upper and Lower Wu'erhe Formations is the result of pressure transfer, and the source of overpressure is the overpressure caused by hydrocarbon generation of Permian Fengcheng Formation major source rock. The petroleum migrated through faults under the driving of hydrocarbon generation overpressure into the reservoirs to accumulate, forming the Permian and Triassic overpressure oil and gas reservoirs. The occurrence and distribution of overpressure are controlled by the source rock maturity and strike-slip faults connecting the source rock and conglomerate reservoirs formed from Indosinian Movement to Himalayan Movement. As overpressure is the driving force for petroleum migration in the large Mahu oil province, the formation and distribution of petroleum reservoirs above the source rock in this area may have a close relationship with the occurrence of overpressure.



中文翻译:

西北准Jung尔盆地麻湖凹陷砾岩油省的超压成因及其对石油成藏的影响

在对测井曲线组合,装卸曲线,声速-密度交会图进行综合分析的基础上,研究了准gar尔盆地麻湖凹陷二叠系/三叠系大型砾岩油省的超压成因及其对油气成藏的影响。和孔隙率比较数据。研究结果表明,研究区存在两种正常的压实模型,即两阶段线性模型和指数模型。下三叠统百口泉组,二叠系上,下乌尔河组等大型砾岩储集层超压是压力传递的结果,超压源是由二叠系凤城组主要烃源岩生烃引起的超压。在碳氢化合物产生超压的驱动下,石油通过断层迁移到储集层中,形成二叠系和三叠纪超压油气藏。过压的发生和分布受烃源岩成熟度和走滑断层控制,这些走滑断层将烃源岩和由印度支那运动形成的砾岩储层连接到喜马拉雅运动。由于超压是马胡大石油省的石油迁移的驱动力,因此该地区烃源岩上方的石油储层的形成和分布可能与超压的发生有密切关系。过压的发生和分布受烃源岩成熟度和走滑断层控制,这些走滑断层将烃源岩和由印度支那运动形成的砾岩储层连接到喜马拉雅运动。由于超压是马胡大石油省的石油迁移的驱动力,该地区烃源岩上方的石油储层的形成和分布可能与超压的发生有密切关系。过压的发生和分布受烃源岩成熟度和走滑断层控制,这些走滑断层将烃源岩和由印度支那运动形成的砾岩储层连接到喜马拉雅运动。由于超压是马胡大石油省的石油迁移的驱动力,因此该地区烃源岩上方的石油储层的形成和分布可能与超压的发生有密切关系。

更新日期:2020-08-21
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