Secondary Limestone Action on Ma5 Member Dolomites in Yichuan-Huanglong Region of Southeastern Ordos Basin
Received date: 2011-07-07
Revised date: 2011-08-17
Online published: 2011-10-10
Dolomitization of limestone is paid attention since it improves the reservoir ability,and a lot of works have been done.But,it is paid less attention to secondary limestone of dolomites.The secondary limestone of dolomites is one of the important types of diagenesis in carbonate reservoir research and has great effects on reservoir.In this paper,we measure the petrology of secondary limestones and in the 5th Member of Majiagou Formation,Ma5 Member and the digenetic stage its formation.We discuss the genesis of secondary limestone as well as the controlling factor on its formation.The results show that the palaeogeomorphological lowland area is favorable for secondary limestone of dolomites.The fracture system is also one of the controlling factors for secondary limestone of dolomites.The micritic gypsum bearing dolomite at low temperature condition is prone to secondary limestone.This achievement will improve the prediction of carbonate weathering crust reservoirs,and plays a role in oil and gas exploration.
LIU Bao-Xian, WANG Hong-Wei, MA Zhan-Rong, LI Lei, LI Yan . Secondary Limestone Action on Ma5 Member Dolomites in Yichuan-Huanglong Region of Southeastern Ordos Basin[J]. Natural Gas Geoscience, 2011 , 22(5) : 789 -795 . DOI: 10.11764/j.issn.1672-1926.2011.05.789
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