柴达木盆地柴北缘煤成气晚期成藏特征

Late Hydrocarbon Accumulation Characteristic of Coal Related Gas in Northern Qaidam Basin

从柴达木盆地北缘天然气地球化学特征和成熟度研究入手,通过典型气藏天然气形成时烃源岩的成熟度分析,结合研究区源岩热演化史和流体包裹体资料,发现研究区天然气藏普遍具有晚期生烃、晚期成藏的特点,提出晚期成藏的新认识,指出受晚喜马拉雅期新构造运动控制的晚期构造是柴北缘天然气勘探的有利目标,能有效指导鄂博梁晚期构造带的天然气勘探,对柴达木盆地晚期构造的油气勘探具有重要借鉴意义。

By taking gas geochemistry and thermal maturity of natural gas as well as thermal maturity of source rock for the typical gas pool in the northern Qaidam basin,we suggest that the general characteristics for the natural gas pools is late hydrocarbon generation and late hydrocarbon accumulation,in combination with thermal history of source rock and fluid inclusion data.Thus,the late trap formed in the late Himalayan period will be favorable gas exploration target.This achievement will greatly guide gas exploration in the Eboliang structure zone and give a sample for late trap gas exploration in the northern Qaidam basin.