Maturity of Tertiary Oil-source in West Qaidam Basin
ZHAO Dong-sheng1、2 ZHANG Min2 ZHANG Dao-wei2 YANG Qian-zheng2 ZHAO Xiao-hua2 LIU Gui-hua2 HAO Xiao-mei2 (1. Geology Department of Northwestern University,Xi′an 710069;2 Company of Qinghai Oilfield,CNPC, Dunhuang, Gansu 736202)
Maturity and types of crude oil depend on maturity of source rock. It is adopted R0, C29-20S/20S+20R and C29-ββ/ββ+αα define the maturity of source rock, and C29-20S/20S+20R, C29-ββ/ββ+αα as well as vitrinite reflectance of crude oil reduction (RC) to define maturity of crude oil in west Qaidam basin. In the light of studies there are two types of crude oil for low-maturity and maturity in west Qaidam basin, original low-maturity crude oil migrate to deep structural trap of Mangya depression and its margin, part of low-maturity crude oil remove to shallow structural trap because of affection of late movement, late maturity crude oil accumulates in the deep structural trap. Therefore, exploration of primary reservoir of low-maturity and maturity crude oil, in the west Qaidam basin, should surround deep structural trap of Mangya and Gasi sag, and shallow structural trap of Xiaolianshan sag and its margin.
【CateGory Index】： P618.13