Researches of mixed sedimentation of the Carboniferous in Bachu-Makit area in Tarim Basin
Fu Meiyan1, Zhang Shaonan1,2, Zhao Xiu3, Lü Yanping3, Chai Fangyuan1
1 Energy Resource College of Chengdu University of Technology，Chengdu 610059，Sichuan 2 School of Resources and Environment of Southwest Petroleum University，Chengdu 610500，Sichuan 3 Petroleum Exploration ＆ Production Research Institute，SINOPEC Northwest Company，Urumqi 830011，Xinjiang
Abstract：The characteristics of clastic-carbonate mixed rocks and mixed bed series of the Carboniferous in Bachu-Makit area in the Tarim Basin were reported，through analyses of petrology，observation of cores，thin sections and well-log data.According to the intensity of mixed sedimentation，the clastic-carbonate mixed rocks are divided into mixed clastic，mixed carbonate rocks and high-mixed rocks.The Lower Mudstone and Middle Mudstone of the Bachu Formation were mixed clastic，while the bioclastic limestone of the Bachu Formation，Xiaohaizi Formation and Middle Mudstone of the Bachu Formation were mixed carbonate rocks，while high-mixed rocks distributed in the Upper Mudstone of the Karashayi Formation and Lower Mudstone of the Bachu Formation，as well as in the Middle Mudstone of the Bachu Formation partly in Bashituo area.The occurrence of high-mixed rocks in clastic of regression corresponded to the transition environment with intense clastic-carbonate mixing.There were four sequences identified in the Carboniferous in this area.The mixed bed series almost formed in the early stage of TST and later period of HST，with punctuated mixing and facies mixing domination.It is concluded that the intensity of mixed sedimentation can be used as a main indicator of evaluating the nature of mixed sedimentation environment，which can be divided into four orders.There was a mixed sedimentary surface in the Lower Mudstone of the Bachu Formation，where the intensity of mixed sedimentation reached the third order，and can be used in stratigraphic correlation.In conclusion，based on the characteristic of clastic-carbonate mixed sedimentation，the main controlling factors of mixed sedimentation were discussed，mainly including tectonic movement and eustatic change.
Fu Meiyan,Zhang Shaonan,Zhao Xiu et al. Researches of mixed sedimentation of the Carboniferous in Bachu-Makit area in Tarim Basin[J]. JOPC, 2012, 14(2): 155-164.
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