Sedimentary characteristics and control factors of gypsum-salt rocks in the Paleogene Xingouzui Formation in Jiangling Depression,Jianghan Basin
Sedimentary characteristics and control factors of gypsum-salt rocks in the Paleogene Xingouzui Formation in Jiangling Depression,Jianghan Basin
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发表时间：
2015
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Mlr Key
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作者：
Mlr Key
江陵凹陷位于江汉盆地西南部。研究表明，资福寺凹陷和梅淮桥南部凹陷古近系新沟嘴组下段发育一套膏盐岩。通过对钻井、测井和岩心资料的分析，总结了膏盐岩的岩性、电性和物性，结合三维地震剖面资料和正演模拟结果，确定了主要岩性组合的地震响应特征：膏盐岩和泥岩夹层具有振幅较高的特征，砂岩-泥岩夹层的振幅中等，纯泥岩的振幅最弱。应用井点预测和均方根幅度法预测新沟嘴组下部膏盐岩的分布规律。结果表明，新沟嘴组下部膏盐岩在平面上分布较为有限，与沙市组相比有明显的南移收缩趋势，主要受物源、构造和沉积环境综合影响。
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.