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渤南洼陷油气资源丰富,成藏过程复杂,但其油气成藏时期的动力条件尚不明确.利用流体包裹体显微荧光、均一温度和冰点测试技术,恢复了渤南洼陷主力储层油气成藏期次及其对应的地层压力.研究区沙三段烃类包裹体发黄白色和黄绿色荧光,均一温度为80~130℃,为明化镇中后期至今一期成藏;沙四段烃类包裹体灰黄色、黄绿、蓝绿色3种荧光,存在70~80℃和90~130℃两个温度区间,对应着东营期、明化镇初期至今两期油气充注,且以晚期充注为主.油气运聚时期普遍发育异常高压,第一期成藏时压力系数相对较低;第二期随着烃源岩生烃量的增加,异常压力持续增大、超压范围不断扩展,压力系数高达1.80,为大规模的油气运移提供了充足的动力条件,并控制了洼陷区油气的聚集与宏观分布.
The Bonan Sag is rich in oil and gas resources and has a complex process of hydrocarbon accumulation, but the dynamic conditions during the hydrocarbon accumulation period are not clear.Using the microscopic fluorescence, homogenization temperature and freezing point test of fluid inclusions, the main reservoir of Bonan Sag Hydrocarbon accumulation period and its corresponding formation pressure.The hydrocarbon inclusions in the third member of the study area have yellowish-white and yellow-green fluorescence with a homogenization temperature of 80-130 ℃, There are three kinds of fluorescence in the four sections of hydrocarbon inclusions, yellowish yellow, greenish green and blue-green. There are two temperature ranges of 70 ~ 80 ℃ and 90 ~ 130 ℃, which correspond to the two periods of oil filling in Dongying period and Minghua town so far With the late filling as the main period.Generally, during the period of hydrocarbon migration and accumulation, the pressure was abnormally high, and the pressure coefficient at the first stage of hydrocarbon accumulation was relatively low. In the second phase, with the increase of hydrocarbon generation amount, the abnormal pressure continued to increase, Expanding continuously with a pressure coefficient up to 1.80, providing sufficient dynamic conditions for large-scale hydrocarbon migration and controlling the accumulation and macro distribution of oil and gas in the subsidence area.