Title: Paleokarst landform of the weathering crust of Middle Permian Maokou Formation in Sichuan Basin and selection of exploration regions
Abstract: In view of incomplete understanding on distribution characteristics of paleokarst landform of Maokou Formation in Sichuan Basin,we studied the geological and geophysical response of karst reservoirs and made a detailed stratigraphic correlation of more than 200 exploratory wells of Maokou Formation in the whole basin.Based on this,we depicted in detail Maokou Formation palaeogeomorphology by using palaeogeomorphologic analysis methods,impression method and residual thickness method,and proposed that there developed geomorphic units in Maokou Formation,karst depression,karst slope and karst highland,which are characterized by three highlands,two slopes and depressions.Formations of the karst depression are basically well preserved,and the Mao-4 section and a part of the Mao-3 section have been missing in the karst highland,while the hiatus of the karst slope is medium between the highland and the depression.This conclusion made a breakthrough at the previous understanding on Maokou Formation weathering crust paleo-geomorphology,which holds a two highlands view.On the basis of this new conclusion and characteristics of the hydrocarbon generating intensity of source rocks,four favorable exploration zones of Maokou Formation were proposed in the paper.
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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Cited By Count: 22
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