泌阳凹陷下二门油田油气成藏机制探讨

为了弄清下二门油田的油气成藏机理,利用包裹体、平衡剖面和生烃史模拟等技术,详细分析了其油气充注成藏过程,结果表明,早期(古近纪核二末期至核一末期)油气小规模缓慢充注,形成早期小规模油气藏;中期(古近纪廖庄期末构造抬升期)受差异抬升构造运动影响,油气大规模快速充注,形成中期大规模原生背斜油气藏;晚期(新近纪上寺组沉积末期)断裂发育,早、中期原生油气藏遭受破坏,同时深凹区核三下、上段生成的高成熟油气沿砂体侧向运移补给,油气大规模沿断层向上运移,遇遮挡形成大量次生油气藏和气藏。

A Discussion on the Reservoir-forming Mechanism of the Xia' ermen oilfield in the Biyang Depression

In order to understand the reservoir-forming mechanism of the Xia' ermen oilfield in the Biyang depression,the oil charging process was analyzed in details by using the techniques of fluid inclusion,equilibrium profile,and hydrocarbon generation simulation in this article.The results have shown that the oil was charged slowly to have formed small sized paleo-oil reservoir in the early period(from late H_2 stage to late H_1 stage of Paleogene);then the oil was charged quickly in a large scale to have formed primary anticline reservoir in the middle period(in late E_1 uplifting stage of Paleogene) due to the different uplifting movements;in the late period(late Ns formation of Neogene),the oil-gas reservoirs which were formed in early and middle period were destroyed due to the development of faults.The oil then was migrated upward in a large scale through faults to have formed secondary oil and gas reservoirs at the places where sealing layers are existed.Meanwhile,the high-mature oil,generated from upper and lower member of H_3 formation source rock in the depression,was migrated through high porous and permeable sandstone and filled into anticline.