东营凹陷高青-平南断裂带幔源流体活动特征及其成藏效应

Mantle-derived Fluids Flow along the Gaoqing-Pingnan Fault and Its Effects on Oil-gas Reservoir Formation in the Dongying Sag

东营凹陷高青-平南断裂带为幔源流体运移的主要通道,该幔源流体主要为岩浆(岩)和CO2气体。高青-平南断裂带幔源流体活动方式和活动强度存在着时间和空间上的差异,该断裂带在古近纪-新近纪至少经历了四期富CO2幔源流体活动。高青-平南断裂带富CO2幔源流体对油气成藏的影响主要表现在:①直接形成无机CO2气藏;②通过能量--热的作用和物质,即CO2的加入,影响水-岩相互作用的强度和方向,从而改善油气储集层的物性;③在一定程度上提高源岩的排烃效率,增加油气的运移速率。

The Gaoqing-Pingnan fault is the primary pathway of mantle-derived fluids flow in the Dongying sag. The mantle-derived fluids consist of magma and CO2. There are temporal and spatial differences in the flow pattern and activity intensity of the mantle-derived fluids in the Gaoqing-Pingnan fault. It has experienced at least 4 times of CO2-rich mantle-derived fluids flow in the Gaoqing-Pingnan fault during the Tertiary. The influences of the CO2-rich mantle-derived fluids on oil-gas reservoir formation in the Gaoqing-Pingnan fault are: (1) to form directly inorganic CO2 reservoirs; (2) to influence the direction and intensity of water-rock interaction and improve the porosity and permeability of the reservoir by the input of energy (i. e. heat action) and material (i. e. CO2); (3) to improve the expulsion efficiency of source rocks and increase oil and gas migration velocity.