Author(s): Shen Junjun, Chen Bo, Wang Chunlian, Chang Junjie, Zhou Xiaofeng, Guan Xiaoqu, Zhao Zhipeng, Hubei Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, MLR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral Resources, Chinese Academy of Geological Sciences, Jianghan Oil Production Plant of Sinopec Jianghan Oilfield, The Geophysical Exploration Research Insititute of Huabei Oilfield, PetroC hina
Pages: 265-274
Year: 2015 Issue:  2
Journal: Journal of Palaeogeography
Keyword:  Jiangling Depression; Paleogene; Xingouzui Formation; gypsum-salt rock; sedimentary characteristic; regularities of distribution char;
Abstract: Jiangling Depression lies in the southwestern Jianghan Basin. Researches have shown that the lower member of Paleogene Xingouzui Formation in the sub-depressions of Zifusi and southern Meihuaiqiao developed a set of gypsum-salt rocks. By the analysis of well drilling,logging and core data,we summarized the lithological,electrical and physical properties of the gypsum-salt rocks combination with the 3D seismic profile data and forward modelling result,the seismic response characteristics of the main lithological association have been determined: Gypsum-salt rock and mudstone interbeds are characterized by higher amplitudes; sandstone-mudstone interbeds show median amplitudes; pure mudstone has weakest amplitude. Well-point prediction and the root mean square amplitude are applied to predict the distribution regularities of gypsum-salt rocks in the lower Xingouzui Formation. The result shows that the distribution of gypsum-salt rocks in the lower Xingouzui Formation is relatively limited on the plane,with an obvious trend of southward migration and shrinkage compared with Shashi Formation,which is mainly affected by comprehensive factors of provenances,tectonics and sedimentary environment.