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徐州大北望地区寒武系为华北地台陆表海环境的典型沉积建造,寒武系碳酸盐岩生油潜力及储集层发育情况都有待于研究。通过分析该区寒武系岩石学及陆表海沉积环境特征,恢复了区域海平面变化、周期及古地理环境。综合野外露头与室内分析,研究区寒武系主要发育的岩石类型为碳酸盐岩,其中鲕粒灰岩厚度较大。该区寒武系陆表海环境中发育沉积相类型主要有潮坪、滩相、滩间海、局限海。该区沉积演化为早寒武世主要以潮坪沉积为主,中寒武世发生了寒武系最大一次海侵,台地鲕粒滩相较发育,晚寒武世水深逐渐变浅,出现局限海、潮坪环境。台地浅滩相中发育的鲕粒灰岩及白云岩为较有利储集岩,该区寒武系云坪沉积具有潜在油气储集意义。
The Cambrian of Xuzhou North Area is a typical sedimentary environment of land surface sea environment in North China. The potential of carbonate oil generation in Cambrian and the development of reservoirs have yet to be studied. By analyzing the Cambrian petrology and land surface sea sedimentary environment characteristics in this area, the regional sea level change, period and paleogeographic environment were restored. According to the field outcrop and indoor analysis, the main types of rocks in the Cambrian of the study area are carbonate rocks, and the oolitic limestone is thicker. There are mainly tidal flat, beach facies, intertidal sea and confined sea in sedimentary facies in the Cambrian terrestrial surface environment in this area. The sedimentary evolution in this area was dominated mainly by tidal flat in the early Cambrian period. The largest Cambrian transgression occurred in the middle Cambrian, the oolitic beach in the platform developed relatively, the water depth in the late Cambrian gradually became shallow, Sea, tidal flat environment. The oolite limestone and dolomite developed in the platform facies are more favorable reservoir rocks, and the Cambrian Yunping sediments have potential reservoir significance.