Geological characteristics and accumulation model of Ordovician marine carbonate in western Ordos Basin
Received date: 2015-04-15
Revised date: 2015-05-20
Online published: 2016-01-10
Well Yutan-1 obtained 34 600m3/d natural gas production in the karst porous fractured reservoir of Kelimoli Formation in western Ordos Basin.According to the geochemical characteristics of source rock and a comparative analysis on carbon isotope of natural gas,it belongs to the oil type gas.This work has the extremely important geological significance for us to rediscover the marine carbonate exploration field of the western Ordos Basin.Through the analysis of the Ordovician paleogeographic evolution,the marine hydrocarbon source rock characteristics,reservoir characteristics and reservoir forming patterns in western Ordos Basin,the article concluded:(1) The western Ordos Basin develops two sets of effective hydrocarbon source rocks:Upper and Lower Paleozoic groups.The Upper Paleozoic marine hydrocarbon source rocks have good hydrocarbon generation ability.(2)This area develops karst porous fractured reservoir,dolomite reservoir and reef -type reservoir.Reservoir performance is better.The karst porous fractured reservoir and dolomite reservoir widely distributed.(3)The western basin develops two sets of effective accumulation patterns,“upper-generation and ldown-preservation type” and “self-generation and self-preservation type”.The western thrust zone and the western part of Tianhuan Sag,belong to self-generation and self-preservation type.The Eastern part of Tianhuan Sag belongs to upper-generation and down-preservation type.Karst porous fractured reservoir and dolomite reservoir are the favorable exploration target area.
Zhang Dao-feng,Liu Xin-she,Gao Xing,Cui Zi-yue,Yan Xiao-xiong . Geological characteristics and accumulation model of Ordovician marine carbonate in western Ordos Basin[J]. Natural Gas Geoscience, 2016 , 27(1) : 92 -101 . DOI: 10.11764/j.issn.1672-1926.2016.01.0092
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