层序地层格架中碳酸盐岩准同生成岩作用分析——以轮南古隆起下中奥陶统碳酸盐岩为例  

Penecontemporaneous diagenesis of the carbonate rocks in a sequence stratigraphic framework:An example from the Lower and Middle Ordovician carbonate rocks in the Lunnan palaeouplift,Xinjian

作　　者：林小兵[1] 王振宇[2] 田景春[1] 谭秀成[2] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059 [2]西南石油大学资源与环境学院,四川成都610500

出　　处：《沉积与特提斯地质》2007年第4期50-55,共6页Sedimentary Geology and Tethyan Geology

摘　　要：根据海平面升降而对海洋碳酸盐岩沉积划分的不同沉积体系域,和其准同生成岩作用之间存在着相关性,这种相关性可以通过不同体系域所发育的成岩作用类型体现出来。文章以塔里木盆地轮南古隆起下中奥陶统碳酸盐岩为例,把准同生成岩作用放在层序地层学格架范畴内来研究,总结了不同体系域内发育的成岩作用类型和特征,认为海侵体系域主要发育方解石胶结作用和白云石化作用,高位体系域主要发育有方解石胶结作用和大气淡水溶蚀作用等。在层序地层格架下进行成岩作用对比的结果表明,高位期以及海侵期下伏的前期高位期沉积,是有利的成岩作用改造层位,并在物性统计数据中得到了证明,为有利储集体的评价、预测提供了新的途径。There is a correlation between the depositional systems tracts based on the eustatic fluctuations and penecontemporaneous diagenesis in the marine carbonate rocks. This correlation, in turn, can be incarnated by the diagenesis developed in the systems tracts. Exemplified by the Middle and Lower Ordovician carbonate rocks in the Lunnan palaeouplift, Tarim Basin, Xinjiang, the types and characteristics of the diagenesis developed in individual systems tracts are summarized in a sequence stratigraphic framework. The calcite cementation and dolomitization mainly occur in the transgressive systems tract （TST）, and calcite cementation and meteoric dissolution dominantly appear in the highstand systems tract （HST）. The comparative study of the diagenesis in a sequence stratigraphic framework shows that the HST deposits and their underlying deposits are believed to be the favourable intervals reworked by diagenesis and potential reservoirs, as proved by statistic physical data for the strata in the study area.

关 键 词：轮南古隆起 下中奥陶统 碳酸盐岩 成岩作用 塔里木盆地 

分 类 号：P588.2[天文地球—岩石学]