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鄂尔多斯盆地西南缘镇泾地区中生界油藏具有储层致密、丰度低、储量大的特点,已钻遇的多口高产井显示出中生界具有良好的油气勘探潜力。西南缘中生界具有多个油气成藏动力系统,不同的油气成藏动力系统具有不同的二次运移动力和通道。通过埋藏史、泥岩压实曲线及物性特征等研究,认为长8段超低渗透油藏的二次运移动力为上覆烃源岩的异常压力,通道主要为渗透层;长6段特低渗透油藏的二次运移动力主要为下伏烃源岩的异常压力,局部为浮力,通道主要为裂缝,其次为渗透层;而延安组油藏的二次运移动力为浮力,通道为裂缝、不整合面和渗透层。对油气二次运移动力和通道的研究,可以更加精细追踪油气运移指向,为鄂尔多斯盆地西南缘下一步的油气勘探提供理论依据。
The Mesozoic reservoirs in Zhenjing area, southwest margin of Ordos Basin, are characterized by tight reservoirs, low abundance and large reserves. Many high-yield wells that have been drilled show that Mesozoic reservoirs have good potential for oil and gas exploration. The Mesozoic in the southwestern margin has multiple hydrocarbon accumulation dynamic systems, and different hydrocarbon accumulation dynamic systems have different secondary motive forces and channels. According to the burial history, the compaction curves of mudstone and physical characteristics, it is concluded that the secondary migration of the ultra-low permeability reservoir in Chang 8 is the abnormal pressure of the overlying source rocks, and the channel is mainly permeable; The secondary migration of the permeable reservoir is mainly due to the anomalous pressure of the underlying source rock, with local buoyancy, with the main channel being the fractures, followed by the permeable layer. The secondary migration of the Yan’an reservoir is buoyancy with a channel of Cracks, unconformities and infiltration layers. The study on the motive force and channel of secondary migration of oil and gas can further trace the direction of hydrocarbon migration and provide the theoretical basis for the next step of oil and gas exploration in the southwestern margin of Ordos Basin.