The Study Of Marine Layers Structure In Longmen Shan Foreland Basin Based On The Seismic Data

Longmen Shan Foreland Basin is located in the western Sichuan Basin, closing to the Longmen Shan thrust belt, in the southeast bordering with east slope of Central Sichuan forebulge. After years of petroleum exploration and development, we confirm that Longmen Shan Foreland Basin is rich in petroleum resources with perfect qualification of reservoir rocks, and there is great exploratory potentiality with lots of Structural traps in marine carbonate layers, Longmen Shan Foreland Basin.The main contents and results of this paper are listed as follows:(1) Based on the recent acquisition of 2-D seismic data and logging data in Longmen Shan Foreland Basin, the study work contains horizon calibration, fault interpretation, structural analysis etc, in order to reveal fracture characteristics and structural features of the marine layers.(2) Understanding the general geology of Longmen Shan Foreland Basin and following foreland basin tectonic theory, horizons calibration and faults interpretation are carried out by according to seismic data process and interpretation, after in progress the analysis of Longmen Shan Foreland Basin structural features applying Fault-related Fold approach.(3) 6 synthetic seismic records are composed by applying the data of 6 wells, and on 21 seismic reflection profiles, stratigraphic unit demarcation is completed with six main horizons. What's more, no less than 30 faults are marked and interpreted, and four Structural maps are drawn in marine layers.(4) According to structural features of the basin, Longmen Shan Foreland Basin is divided into five tectonic units, as follows: LongmenShan-Basin Transition Belt, Longquanshan fold Belt, Pengxian - Mianzhu syncline Zone, Xiaoxinhe structure Zone and Southeast slope Belt. Finally, seven local structures are discussed in order to the analysis and description of elements of structural traps. The comprehensive analysis of regional fracture characteristics of marine layers and structural features in Longmen Shan Foreland Basin, is laying the groundwork for the next step of petroleum exploration.