塔北于奇地区奥陶系碳酸盐岩成岩环境分析——来自于流体包裹体的证据
网络出版日期: 2013-10-08
Diagenetic environments of Ordovician carbonate rocks in Yuqi area,northern Tarim Basin:Evidence from fluid inclusion analysis
Online published: 2013-10-08
运用流体包裹体技术,从岩相学特征、均一温度及盐度特征等方面探讨了塔北于奇地区奥陶系储层碳酸盐岩的成岩作用环境及期次。分析结果表明:孔洞充填方解石胶结物中检测到的流体演化趋势为I c(低温一高盐度盐水包裹体)一Ⅱ .B(中温一低、中盐度盐水包裹体)一Ⅲ (高温一低盐度盐水包裹体);裂缝充填方解石胶物中检测到2期流体,分别为中温一低、中盐度流体(1I )和中温一中、高盐度流体(1I ),这2期流体的盐度随均一温度的升高而降低。结合研究区沉积埋藏史,推断盐水包裹体指示该区成岩环境演化趋势为海洋成岩环境向大陆成岩环境演变,在加里东一海西早期经历了表生大气水环境的改造,其后随中新生界的沉积再次埋藏.构成了中期开启型成岩演化系统。
Yuriy Tyapkin , Iana Mendrii . 塔北于奇地区奥陶系碳酸盐岩成岩环境分析——来自于流体包裹体的证据[J]. 岩性油气藏, 2013 , 25(4) : 38 -43 . DOI: 10.3969/j.issn.1673-8926.2013.04.008
Abstract:The Ordovician carbonate rock is one of the principal producing formations in Yuqi area,northern Tarim
Basin.Through the use of fluid inclusion technology,this paper discussed the diagenetic environment and stages of
Ordovician carbonate reservoir from the aspects of petrography characteristics,homogenization temperature and salinity.
The result shows that three groups of saline water inclusions were detected in pore filling calcite,and the fluid evolutionary
trends is I c(1ow temperature and high salinity) ⅡA_H(middle temperature and low to middle salinity) ⅢA(high
temperature and low salinity);there are two episodes offluid activities in fracture filling calcite:II A_H(middle temperature
and low to middle salinity)and lI B—c(middle temperature and middle to high salinity),and both of their salinity decrease
with homogenization temperature increase.Combined with burial history and saline water inclusions research in Yuqi area,the evolution of diagenetie environments was determined to trend from marine to continental diagenetic environment.
During Caledonian·early Hercynian stage,Yuqi area experienced exposure palaeokarst,and subsequently buried with
the Meso·Cenozoic deposition,which constitutes a diagenetie evolution of a mid open—type system.
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