Four main paleouplifts evolution in Ordos Basin and their differences in significance of oil and gas reservoir control
BAO Hongping1,2, HE Dengfa3, WANG Qianping1,2, ZHANG Lei1,2, ZHANG Jianwu1,2, YAN Ting1,2, YAN Wei1,2
1 Institute of Exploration and Development,Changqing Oilfield Company,PetroChina,Xi'an 710018,China;; 2 National Engineering Laboratory for Exploration and Development of Low Permeability Oil & Gas Fields,Xi'an 710018,China;; 3 School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;
Abstract：The Ordos Basin contains four main paleouplift structures in geological history, i.e., the Central,Ulager,Weihe,and Wushenqi Paleouplifts. This paper systematically analyzed the four paleouplifts with respect to stratigraphic distribution and tectonic evolution,and put forward a new concept of the Weihe Paleouplift. The four paleouplifts formed in different geological ages and regional tectonic environments,and it underwent different evolutionary processes: (1)The Central Paleouplift formed in the extensional tectonic setting of the Early Paleozoic,which was reversed and transformed into a depression subsidence area during the Indosinian period;(2)The Ulager Paleouplift is a long-term inherited uplift that has existed since the formation of the basin basement;different uplift subsidence occurred in the Cretaceous and Cenozoic and differentiated into different units of the present structure;(3)The Weihe Paleouplift formed in a regional compressive tectonic environment in the Cretaceous. It is also differentiated by differential uplift subsidence in the Cenozoic into different units of present structure;(4)The Wushenqi Paleouplift was an ancient topographic highland that existed in Precambrian,with no further development in the Early Paleozoic. Therefore,it was highlighted only in the Cambrian and disappeared rapidly after the Ordovician. The differences of reservoir control in paleouplifts are mainly as follows: (1)The paleouplift formed prior to and during the Paleozoic played a positive role in controlling facies,storage and source-storage configuration,and that the paleouplift later on from uplift to depression is beneficial to the evolution and accumulation of oil and gas,and reservoir formation;(2)The later uplift since the Cretaceous is mainly destructive to oil and gas accumulation,especially for Paleozoic natural gas reservoirs.
BAO Hongping,HE Dengfa,WANG Qianping et al. Four main paleouplifts evolution in Ordos Basin and their differences in significance of oil and gas reservoir control[J]. JOPC, 2022, 24(5): 951-969.
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