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依据《碎屑岩成岩阶段划分规范》 ,黄骅坳陷板桥凹陷根据古地温、孢粉颜色、TAI、Ro、泥岩中黏土矿物演化等各项指标所划分的成岩阶段之间存在着明显的不吻合现象。分析认为 ,这是由于板桥凹陷普遍存在异常高压 ,而压力对有机质热演化和无机物质反应具有明显的抑制作用 ,延缓了有机质成熟 ,温度虽然较高 ,但成岩演化阶段出现相对滞后的现象。为此 ,根据自生矿物组合、黏土矿物演化及有机质热演化等 ,重新建立了异常温压背景下碎屑岩储集层成岩阶段划分方案。图 4参 2表 4
According to the criteria for classification of clastic diagenetic stages, the diagenetic stages in Banqiao Sag of Huanghua Depression are classified according to paleo-geothermal, pollen color, TAI, Ro, clay mineral evolution in mudstone Anastomosis phenomenon. It is considered that this is due to the widespread abnormal pressure in Banqiao sag, and the pressure obviously inhibits the thermal evolution of organic matter and inorganic matter, slows down the maturation of organic matter, and the relatively high temperature leads to relative lag in the evolution stage of diagenesis. Therefore, according to the composition of authigenic minerals, the evolution of clay minerals and the thermal evolution of organic matter, the division scheme of diagenetic stage of clastic reservoirs in the background of abnormal temperature and pressure is re-established. Figure 4 Reference 2 Table 4