【摘要】 采用生烃动力学和碳同位素动力学的方法,通过对苏里格气田、榆林气田和神木气田的剖析,认为这3个气田的气源主要来自其南部或西南部的石炭-二叠系的煤系地层;烃源岩生烃始于150Ma左右,出现在定边及以南的气源岩区,并存在由南向北、由西向东推进的趋势;天然气区域运移方向是由西南向东北,局部运移方向是由下向上。在这种地质地球化学背景下,苏里格气田、榆林气田和神木气田开始充注的时间分别为150、140和120Ma左右。在此基础上,进一步总结了该区天然气运聚规律。更多还原

【Abstract】 The methods of hydrocarbon generation and carbon isotopic kinetics are studied in Sulige Gas Field, Yulin Gas Field and Shenmu Gas Field, which indicate that the gas is mainly from Carboniferous-Permian coaly stratum in the south or southwest of the three gas fields; the hydrocarbon generation of source rock is firstly originated from 150Ma or so in Dingbian and its south area, and is successive from south to north and from west to east; the migration directions of natural gas are regionally from southwest to northeast, and partially from bottom to top. Under such geological and geochemical backgrounds, the natural gas charging into Sulige Gas Field, Yulin Gas Field and Shenmu Gas Field is respectively at 150Ma, 140Ma and 120 Ma. Based on the study stated above, the rules of gas migration-accumulation can be further summarized in the area.更多还原