Title: SEDIMENTARY AND DIAGENETIC EVOLUTION OF THE UPPER CRETACEOUS-EOGENE CONTROLLED BY SEQUENCE STRATIGRAPHY IN WESTERN TARIM BASIN
Abstract: Seven high-frequency cyclic sequences with typical genetic implication can be distinguished in the Upper Cretaceous-Eogene in western Tarim basin. According to their vertical stacking patterns, a characteristic sequence stratigraphy can be established, which is composed of five fourth-order cyclic sequences, two third-order cyclic sequences and one second-order cyclic sequence. The sequence stratigraphy fundamentally controls the spatial and temporal distribution of different depositional facies and associations of source, reservoir and cap rocks. The Upper Cretaceous in the southwestern margin of the study area consists of a set of thick limestone reservoirs formed in HST open platform facies. Since the system was influenced by marine diagenetic environment, the reservoir porosity was seriously destroyed by intense cementation. Therefore, the Cretaceous reservoir is low in porosity and permeability. The Eogene is composed of alluvial plain-fluvial facies sediments that are lower and acidic in diagenesis, so the Eogene reservoir properties are much better than those of the Upper Cretaceous. Furthermore, four types of favorable depositional-diagenetic facies could be identified.
Publication Year: 2002
Publication Date: 2002-01-01
Language: en
Type: article
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Cited By Count: 1
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