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通过沉积相剖面、岩石结构和多项地球化学指标、油气源岩性质对比及流体非均质性与运移路径分析等新技术方法,运用流体-岩石相互作用和流体成藏动力学新理论,研究了川东北地区飞仙关组和长兴组白云岩成因和成藏特征,确定此2个层位的优质生物礁相和鲕滩相白云岩储层成因主要与成岩期的埋藏白云岩化作用有关,都属于同源流体和同一流体输导体系控制的多期次、多阶段埋藏白云岩化与连续的重结晶作用产物,论证了飞仙关组和长兴组与埋藏白云岩化作用及多期次油气运移、充注和成藏过程也受同一流体输导体系和同一油气源控制。依据埋藏白云岩化过程的成岩系统划分与成藏过程在时空上的耦合匹配关系,提出以通源断裂/裂隙带为核心的,由断裂/裂隙带、不整合面和优质礁、滩相白云岩储层构成的复合输导体系为主控因素的统一“成岩-成藏系统”概念。
Based on the new theories of fluid-rock interaction and fluid accumulation kinetics, through the sedimentary facies section, the rock structure and a number of geochemical indicators, the nature of oil and gas source rocks and the analysis of fluid heterogeneity and migration path, The genesis and reservoir forming characteristics of the dolomite in Feixianguan Formation and Changxing Formation in the northeastern Sichuan were studied. It is concluded that the dolomite reservoirs of the high quality reef and oolitic facies in these two layers are mainly formed by burial dolomitization Are related to multi-stage and multi-stage burial dolomitization and continuous recrystallization products under the control of same-source fluid and same fluid-conducting system. It is demonstrated that Feixianguan Formation and Changxing Formation are associated with burial dolomitization and more Periods of hydrocarbon migration, filling and reservoir formation are also controlled by the same fluid transport system and the same oil and gas source. According to the coupling relationship between the diagenetic system and the process of hydrocarbon accumulation in the time and space of burial dolomitization, the paper proposes a series of fractures and fractures that are dominated by Tongyuan fault / fracture zone and are composed of faults and fissures, unconformities, The composite transport system composed of rock reservoirs is the unifying principle of “diagenesis - reservoir forming system”.