Two Types of Strike-Slip and Transtensional Intrabasinal Structures Controlling Sandbodies in Yitong Graben

• Published in: Journal of earth science (Wuhan, China) China), 2011-06, Vol.22 (3), p.316-325
• Main Author: 王家豪 陈红汉 王华 江涛 苗红波
• Format: Article
• Language: English
• Subjects: Biogeosciences; Cenozoic; Earth and Environmental Science; Earth science; Earth Sciences; Fault lines; Geochemistry; Geology; Geotechnical Engineering & Applied Earth Sciences; Graben; Petroleum; Seismology; 中国东部; 伊通地堑; 地震剖面; 砂体; 结构控制; 结构类型; 走滑运动; 边界断层
• ISSN: 1674-487X; 1867-111X
• DOI: 10.1007/s12583-011-0184-7

Recently,the researches on structure controls on sandbodies have provided a new method for predicting petroleum reservoirs.The Yitong（伊通） graben is situated in the northern section of the Tan-Lu（郯-庐） fault system in eastern China.It was characterized by dual properties of strike-slip and extension in Cenozoic.Two types of intrabasinal structures were identified as oblique fault and trans-verse uplift in the graben.The oblique faults arranged en echelon in plain and locally presented nega-tive rosette structures on seismic profile,so they were closely derived from strike-slip movement of the northwestern boundary faults.Moreover,these oblique faults were divided to five zones.The three transverse uplifts,located corresponding to flattened southeast boundary faults,were mainly originated by displacement-gradient folding due to segmental extensional activities of southeast boundary faults.The large-scale sandbodies of subaqueous fan facies and fan delta facies had developed at the two types of intrabasinal structure zone.Based on analyzing the seismic facies,logging facies and seismic attrib-ute extractions,and on discovering many incised valleys at the oblique fault zones,the two types of in-trabasinal structures were revealed to have conducted drainage entering basin and further dispersing,and to have consequently controlled the development and distribution of sandbodies.