Progradation reflection characteristics and significance in Shiwu fault depression,Songliao Basin
Liu Peng-bo1,2,4, Pu Ren-hai1,2, Liu Juan-xia3
1. The Key Laboratory of Continental Dynamics,Northwest University,Xi'an City,Shaanxi Province 710069,China;
2. Geology Department,Northwest University,Xi'an City,Shaanxi Province 710069,China;
3. Exploration&Development Institute,Dagang Oilfield Branch Company of PetroChina,Dagang District,Tianjin City 300280,China
Abstract：Four sets of progradation reflection which came from NW,North and SE were found from the Huoshiling formation to Shahezi Formation strata in Shiwu fault depression deep belt.By carefully interpreting the distribution and their relationship of the duo leaves inside every prograding body and based on the studies of sandstone thickness forward modeling,it is believed that the first set of progradation reflection which is from steep slope is underwater gravity flow cause,the other three sets of progradation reflection are turbidite fan cause,every duo leave sandbody is about 10 to 15 meters thick and every progradation reflection sandbody is about 40 to 50 meters thick.The turbidite fan sand bodies are embedded in the dark mudstone,east side of the deep depression raised up,the dramatic faulting activities did not affect deep progradation reflection bodies too much,so the excellent source-reservoir-seal assemblage and lithology reservoirs might develop.
