Cl- evolution mechanism of Yanchang stage of Late Triassic in Ordos Basin and its significance
Online published: 2013-09-26
Cl- is the most important anion in the formation water chemical composition of the Upper Triassic Yanchang Formation in Ordos Basin, and it is the most important index to decide the formation water type, total salinity and salinity. Paleosalinity has important influence on oil and gas generation and preservation, the restoration of paleosalinity is important for the reconstruction of paleoenvironment and paleogeography and assessment of petroleum system. This paper analyzed the distribution characteristics of Cl- concentration and total salinity of the reservoir of Yanchang Formation, drew on the latest research achievements of modern lake environment, and studied the Cl- evolution mechanism from the aspects of basin evolution, sedimentary facies, paleoclimate and ancient seawater intermittent injection. The result shows that the intensity of water circulation is the dominant controlling factor for Cl- concentration and total salinity, sedimentary facies and different hydrogeological environment formed by lake basin evolution are important factors for controlling Cl- concentration and total salinity, and paleoclimate and ancient seawater intermittent injection may have certain control effect on Cl- concentration and total salinity. The formation water types and total salinity have important significance for the found, identification and evaluation of reservoir.
LI Xinyu , ZENG Qingcai , BAO Shihai , HUANG Jiaqiang . Cl- evolution mechanism of Yanchang stage of Late Triassic in Ordos Basin and its significance[J]. Lithologic Reservoirs, 2013 , 25(5) : 18 -23 . DOI: 10.3969/j.issn.1673-8926.2013.05.004
/
| 〈 |
|
〉 |