摘要
石炭系东河砂岩是塔里木盆地塔中40油田的储集层,在成藏过程中伴生了大量的流体包裹体,流体包裹体的均一温度明显分为88.6～100.73℃和122.1～144.7℃二个区间,它们可能反映了油藏形成的不同时间和深度,反映了两个不同的成藏期。根据该区储集层的埋藏史、热演化史和烃源岩的演化史推测,第一成藏期发生在侏罗纪,由于后来的构造运动,油藏几乎全部被破坏;第二成藏期发生在第三纪,并保存到现今。在荧光薄片中,发现一些石英次生加大边与石英颗粒之间有油质沥青存在,这可能是在第一成藏期形成的。成岩作用研究结果认为,二次成藏的时间和深度与运用流体包裹体的均一温度研究油藏所得出的结论大致相当,说明利用流体包裹体的均一温度研究油藏成藏期次是可行的,结论是正确的。
Tazhong40oilfield is a small field recently proved in Tarim basin.Its reservoir is Donghe sandstone of Carboniferous.A lot of fluid inclusion enclaves were formed during its hydrocarbon accumulation with uniform temperature of the enclaves being divided into two intervals ranging from88.6～100.73℃to122.1～144.7℃.They reflect different time and depths or represent two different stages of hydrocarbon accu-mulations.According to the reservoir buried history,thermal alternation history and hydrocarbon source rock evolution history,it is supposed that Jurassic is the first stage of hydrocarbon accumulation,but almost all of its oil pools had been destroyed due to tectonic movements occurred afterwards;Tertiary is the second stage of it and no destruction takes place.It is found from fluorescent thin section that existence of oil-asphalt a-mong quartz secondary outgrowth rims and quartz grains could be formed during the first stage.The results of reservoir diagenesis research show that the time and depth for secondary hydrocarbon accumulation are consis-tent with the conclusion from fluid inclusion enclave.This explains that using the uniform temperature of fluid inclusion enclave to study stages of hydrocarbon accumulation into reservoirs is feasible,and the conclusion is right.
出处
《新疆石油地质》
CAS
CSCD
2002年第4期338-339,共2页
Xinjiang Petroleum Geology
