ORIGIN AND CHARACTERISTICS OF ABNORMAL PRESSURE IN THE JUNGGAR BASIN
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摘要: 准噶尔盆地普遍发育异常高压,但由于沉积及构造背景的差异,其成因也不尽相同。其中腹部以成岩作用和烃类生成作用为主控因素,南缘则以欠压实作用和构造抬升作用为主,东部的博格达山体的强烈逆冲所产生的附加应力造成了山前广大区域的超压。值得一提的是,克拉美丽山前的五彩湾凹陷是异常低压的典型分布区,它的形成与石炭系和二叠系前陆盆地形成的深凹槽密不可分。Abstract: Due to differences in tectonic movement and sedimentation, multiple types of abnormal pressure were developed in the Junggar Basin. According to their forming mechanisms, the abnormal pressure systems of the whole basin may be divided into four types. In the center of the basin,diagenesis and hydrocarbon generation are the key factors resulting in overpressure. Undercompaction and uplift controlled the development of abnormal high pressure in the south and in east of the basin, strong lateral compressive stress from Bogeda Mountain brought on overpressure in a large area. Besides, abnormal low pressure was found in Junggar basin for the first time. Different from wide distribution of abnormal high pressure, low pressure is mainly limited in Wucaiwan Depression at front of Kelameili Mountain. This low pressure belt is related to deep geosyncline of foreland basin formed in Carboniferous and Permian Periods.
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Key words:
- overpressure /
- abnormal low pressure /
- origin /
- the Junggar Basin
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