Controls of Buried History on Oil Accumulation Processes in Daqing Placanticline of Northern Songliao Basin
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摘要: 利用890余口钻井资料, 综合应用埋藏历史、盆地数值模拟、成藏年代学研究方法, 查明了松辽盆地北部埋藏历史对大庆长垣油藏成藏过程的控制.松辽盆地北部普遍经历了3次沉降、2次抬升.青山口组到嫩江组、四方台组到明水组、新第三系泰康组到第四系沉积时期, 构成3次沉降, 其中以嫩江组沉积后期(嫩三~五段沉积时期) 和明水组沉积时期沉积速率最大, 分别达16 0m/Ma和180m/Ma.而2次区域抬升分别发生于嫩江组沉积后和明水组沉积后, 大庆长垣背斜构造主要是在这2次构造抬升过程中形成的.青山口组主力烃源岩具有漫长的生排油历史, 而且生排烃过程与构造活动及圈闭增长过程在时间和数值上具有良好的匹配关系.在73Ma左右和65~ 40Ma之间为大庆长垣油藏的成藏高峰期.盆地沉降过程是油气生成量积累的过程, 盆地抬升、构造定型阶段是油气排出和成藏高峰期Abstract: Based on data of more than 890 drilling wells, the controls of buried history on oil accumulation processes in the Daqing placanticline of northern Songliao basin have been elaborated by means of basin simulation and dating technique of oil reservoir. Northern Songliao basin had been undergone 3 subsidences and 2 uplifts. Duration of 3 subsidences are, respectively, Qingshankou-Nenjiang, Sifangtai-Mingshui and Tertiary-Quaternary periods, of them, during the periods, the biggest depositional rates with respectively 160 m/Ma and 180 m/Ma occur at Late Nenjiang and Mingshui periods. 2 uplifts respectively betided on the end of Nenjiang and Mingshui periods, which results in the formation of the Daqing placanticline. The oil generation and expulsion of the major source rocks of Qingshankou Formation maintain for a very long period, which started from about 77.4 Ma, and matched well with tectonic activity and formation of trap. The results indicate that two oil accumulation peaks occur respectively about 73 Ma and 65-40 Ma, which are in agreement with the processes of basin uplifts and structure formation.
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Key words:
- buried history /
- oil generation /
- oil expulsion /
- process of oil accumulation /
- Songliao basin
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图 1 松辽盆地不同地区埋藏历史
a.龙虎泡大安阶地(杜408井); b.齐家—古龙凹陷(金20井); c.大庆长垣(杏4井); d.三肇凹陷(芳深4井)
Fig. 1. Buried histories in different areas of Songliao basin
图 2 大庆长垣地区生排油量与圈闭生长过程匹配关系
Fig. 2. Match relationship between processes of oil generation-expulsion and structure trap growth of Daqing placanticline oil-accumulation system
图 3 地质历史时期大庆长垣地区沉降速率与生油速率
Fig. 3. Velocities of subsidence and oil generation in geological histroy of Daqing placanticline oil-accumulation system
表 1 大庆长垣聚油系统内不同地质时间累积生排油量
Table 1. Data of oil generation and expulsion at different geological times of Daqing placanticline oil-accumulation system
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