【作者】 马玉新； 赵勇生； 田海芹；

【Author】 Ma Yuxin Zhao Yongsheng Tian Haiqin(Department of Resource Science of Petroleum University .Dongying)

【机构】 石油大学资源系；

【摘要】 塔北隆起是从加里东期开始发育至中生代末终止的一个古老潜伏隆起,内部结构复杂.在这个古隆起上,发育了不同时代、不同埋深、不同沉积环境、不同类型的优质砂岩储层.这些储层又不同程度地遭受了压实压溶、自生高岭石胶结、石英次生加大、交代、碳酸盐析出、硅酸盐颗粒溶解等一系列成岩作用的改造.本文对硅酸盐的溶蚀、高岭石和石英的析出、以及碳酸盐的沉淀与溶解等重要成岩作用机理进行了较为深入的理论探讨.并认为,目前本区各主要碎屑岩储集层处于早成岩B亚期至晚成岩B亚期早期.由于受本区特殊的地质背景——低地温场和快速埋藏发生于上新世的控制,导致深埋储层的成岩变化不很强烈;受酸源岩本身含碳酸盐、地温梯度低而压力梯度正常的影响,来自碳酸盐岩向上运移进入储层的地层水以析出而不是溶解碳酸盐为主,导致储层中硅酸盐强烈溶蚀而碳酸盐基本不溶,因而产生了这些深埋优质储层.更多还原

【Abstract】 The Norten Tarim uplift is an old buried uplift with complicated internal structure. Its development began in the early Paleozoic and terminated at the end of the Mesozoic. All the reservoirs had experienced a series of diageneses, such as compaction, pressure solution, quartz secondary enlargement, replacement, carbonate crystallization and even silicate grain dissolution to different degree. The article puts an important premium on discussing the silicate dissolution , the crystallization of kaolinite and quartz as well as the carbonate dissolution and deposition. According to our elaborate study, the eralier sub - diagenesis B and the later sub - diagen-esis B are important in the evolution of the reservoirs in the North of Tarim uplift. The geological background of the uplift is characterized by low geothermal gradient and rapidly burying in the Pliocene Epoch. The special geological background results in the mild diageneses. Because the formation riched in carbonates, with low geothermal gradient and normal pressure gradient , the carbonates easily precipitate rather than dissolve in the formation water derived from the carbonate rock when the formation water migrates up to the reservoirs. As a result, the silicate is subject to intensely dissolve and the carbonate is hardly dissolved in the reservoirs. So the deep buried excellent reservoirs are developed.更多还原