川东石炭系碳酸盐岩储层地球化学自组织研究

川东石炭系碳酸盐岩储层,形成机制主要为白云化和古岩溶作用.在成岩作用与古岩溶作用研究的基础上,用地球化学自组织理论深入研究了流体热驱对流对储层的影响.结合孔隙介质中水的运移形式,提出川东石炭系碳酸盐岩储层的3个成岩模式:(1)顶部固结一扩散成岩模式;(2)中部岩溶一热驱对流成岩模式;(3)底部淡水平流去白云化成岩模式.控制本区储层发育及分布的主要因素是古岩溶一热驱对流作用.

THE STUDY OF GEOCHEMICAL SELF-ORGANIZATION IN THE RESERVOIRS OF CARBONIFEROUS CARBONATE IN EASTERN SICHUAN BASIN

The mechanisms responsible for the formation of carbonate reservoirs are dolomitization and karstifi-cation. On the basis of the study of diagenesis, the authors have studied the effect of fluid convection on the distribution of carbonate reservoirs and established three diagenetic models in light of geochemical self-organization: (1)consolidation-filtration diagenetic model; (2)karstification-fluid convection diagenetic model; (3)freshwater advection diagenetic model. It is suggested that the fundamental factor to affect the reservoir property is karstification-fluid convection diagenesis.