The Reservoir Study On Proterozonic Buried-hill In Damintun Sag, Liaohe Basin

The author applies comprehensively geology , tectonics and some updated theories and methods to the study, and takes advantage of geology, seism, logging and other multi-professional technologies incorporating computer technology. The study investigates intensively the faults system, formation lithology, strata distribution, reservoir space style, fracture distribution, reservoir physical property and other important and difficult problems, and especially makes predictive study into fracture distribution.The study area is Anfutun burial hill and Shen257 burial hill, which lies in the north of Qiandangbao faults. The Proterozoic strata is made of marine detrital and carbonate, and the main lithologies are dolomite, quartzite and pelite. The paper sets up stratigraphic sequence on the base of region geological background, and also studies the burial hill strata spacial distribution characteristics on the base of core describing,stratigraphic dip and imaging log interpretation.Based on the 3D seismic fine interpret technology, the paper ascertains Proterozonic and Archean burial hill superface construct, and analyzes the burial hill faults framework and the burial hill inner construct. Based on the system coring and core analyzing materials combining log interpretation technology, the burial hill reservoir rock are mainly the dolomite of Ptd2 and the quartzite of Ptg4, meanwhile the quartzite of Ptg4 and the dolomite of Ptg2, g6 can also be the good reservoir rock. The main reservoir space style are macroscopic cracking,solution cavity,corroded hollow and inter-crystalline suture. The macroscopic suture is the passage of reservoir space. The fractured reservoir interpret standard is set up on the base of logging cross plot technique. The reservoir is divided into three classes, and the reservoir properties become worse fromâ… toâ…¢class. Based on core observing, 3700 logging and imaging log interpretation technology, terrestrial stress experimental analysis technology and seismic inversion technology, the paper investigates comprehensively the burial hill lithology and fracture distribution, and predicts the good fracture distribution zones.