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莺歌海盆地因其异常高压和高温热流体强烈活动而孕育了多种特殊地质现象。应用分析化验资料与热力学计算相结合的方法,研究了莺歌海盆地黏土矿物转化的特征,分析了其成因。结果表明,莺歌海盆地发育三种黏土矿物转化类型:正常演化型、快速演化型和缓慢演化型。其中超压抑制黏土矿物转化,形成黏土矿物缓慢演化型;高温热流体活动促进黏土矿物转化,形成黏土矿物快速演化型。超压对黏土矿物转化的抑制作用延缓了H+、阳离子和层间水的排出,减弱了胶结作用和溶蚀作用,有利于在深部形成优质储层。热流体的活动加速了黏土矿物转化,增强了储层的胶结作用,不利于深部优质储层的发育。
In Yinggehai Basin, a number of special geological phenomena have been developed due to their unusually high pressure and high temperature thermal fluid. The characteristics of clay mineral transformation in Yinggehai Basin are studied by means of the combination of analytical laboratory data and thermodynamic calculation, and the causes of the transformation are analyzed. The results show that there are three types of clay mineral transformation in Yinggehai Basin: normal evolution, rapid evolution and slow evolution. Among them, overpressure suppresses the conversion of clay minerals and forms a slow evolution of clay minerals. High temperature thermal fluid activities promote the conversion of clay minerals to form a rapidly evolving clay mineral. The inhibition of clay mineral transformation by overpressure delayed the discharge of H +, cation and interlayer water, weaken the cementation and dissolution, which is good for the formation of high quality reservoirs in the deep. Thermal fluid activities accelerate the conversion of clay minerals and enhance the cementation of the reservoir, which is not conducive to the development of deep high-quality reservoirs.