Types,structural evolution difference and petroleum geological significance of Cambrian-Ordovician carbonate platforms in Gucheng-Xiaotang area,Tarim Basin,NW China

作     者：LIU Yini HU Mingyi ZHANG San LIU Yini;HU Mingyi;ZHANG San

作者机构：School of GeosciencesYangtze UniversityWuhan 430100China 

出 版 物：《Petroleum Exploration and Development》 (石油勘探与开发（英文版）)

年 卷 期：2022年第49卷第5期

页      面：1019-1032页

核心收录：

学科分类：0820[工学-石油与天然气工程] 081803[工学-地质工程] 08[工学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 

基　　金：National Natural Science Foundation of China(42072171) National Oil and Gas Major Science and Technology Project(2016ZX05007-002) 

主　　题：carbonate ramp rimmed platform platform margin structure differential evolution of carbonate platform Cambrian Ordovician Tarim Basin Gucheng-Xiaotang area 

摘      要：Based on the latest drilling cores,thin sections,and 3D seismic data,types,features,and evolution processes of Cambrian-Ordovician carbonate platforms in the Gucheng and Xiaotang areas are studied,and favorable exploration zones in this area are also *** are two types of carbonate platforms developed in the Cambrian-Ordovician in the Gucheng-Xiaotang area,namely,carbonate ramp and rimmed platforms,and the evolution process of the platform in the Gucheng area is different from that in Xiaotang *** the Early Cambrian,the study area was a homoclinal carbonate *** the Middle to Late Cambrian,it evolved into a rimmed platform,with 5 phases of mound shoals *** the southern area,mound shoals were in progradational arrangement and the third and fourth stages of mound shoals suffering exposure and further developed abundant karst *** the northern area,the mound shoals appeared in a superposition of aggradation-weak progradation,the third,fourth,and fifth stages of mound shoals suffered exposure and dissolution,and the platform slope developed gravity flow *** the Early to Middle Ordovician,the southern area gradually evolved into a distally steepened carbonate ramp,where retrogradational dolomitic shoal developed;while the northern part experienced an evolution process from a weakly rimmed platform to a distally steepened carbonate ramp,and developed two or three stages of retrogradational mound *** high-frequency oscillation of sea level and local exposure and dissolution were beneficial to the formation of mound or shoal reservoirs in platform margin and ramp,and the configuration of these reservoirs with low energy slope-basin facies source rocks could form good oil-gas enrichment *** dolomitic shoal in the Ordovician platform ramp is the practical exploration field for increasing reserve and production in the Gucheng *** mound shoal at the Cambrian rimmed platform margin is the key exploration object in the X