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《Acta Sedimentologica Sinica》 2009-01
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Organic Bioherms and Their Forming Models of Changxing Formation in Manyue-Ganquan Section of Kaixian, Northeast Sichuan

RONG Hui1 JIAO Yang-quan1,2 WU Li-qun1 LI Rong1 WANG Rui1 WANG Shi-hu1 YANG Shang1(1.Faculty of Earth Resources, China University of Geosciences, Wuhan 430074;2.Key Laboratory of Technique and Petroleum Resources of University of Education, China University of Geosciences, Wuhan 430074)  
Two phases of bioherms are respectively developed in the middle-upper of two descending cycles in the forepart of Changxing Formation in Manyue-Ganquan section of Kaixian, northeastern Sichuan. By the outcrop surveying, observation by microscope and diffraction of X-ray, the composition of bioherms is researched in detail. It is found that the first phase of bioherm in which the bioherm-building organisms are dominated by cyanobacteria and the lithology includes micrites and dolomitised limestone is composed of bioherm-bottom and bioherm-core. The second phase of bioherm in which the bioherm-building organisms are dominated by algae primarily and types of sponges and corals later and the lithology includes micrites with partly dolomitation is composed of bioherm-bottom, bioherm-core and bioherm-top and turns to reef finally. Based on that, the bioherm-forming models of two bioherms are discussed: the former which develops on the platform margin shoal-slope is low energy bioherm and has two phases of evolvement, while the latter which develops on the platform-margin shoal and reef is high energy bioherm and has four phases of evolvement.
【Fund】: 教育部构造与油气资源重点实验室开放基金项目(批准号:YQ2006KF18);; 中国石油化工集团公司项目(编号:2006026015);; 中国石油化工集团公司前瞻性项目专题(编号:2007026230)联合资助
【CateGory Index】: P512.2
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