| In order to guarantee the increase of JLK oil and gas fields’s reserves and production. Inthis paper, a lot of drilling, logging, coring data was used, with the tech help of thin sectionidentification, X-ray diffraction, mercury porosimetry, scanning electron microscope, throughthe depth study of JLK’s formation, structure, sedimentary, reservoir diagenesis, micro porestructure, physical property and heterogeneity characteristics, Comprehensivly establish thestandard of reservoir evaluation. The results indicates that,the type of JLK sedimentary faciesis braid delta front, microfacies includes channel, channel sand bar, sheet sand and overbank,channel, channel sand bar are the main reservoir. The layer’s interlayer heterogeneity andplane heterogeneity heterogeneity are very strong. Reservoir is middle holes and miniaturethroats, and physical analysis shows that reservoir is medium porosity and mediumpermeability type. The reservoir has the characteristics of high boiling point, light fraction,low density, low viscosity, low solidifying point, low initial. Formation water is the calciumchloride type,which is high salinity, The type of JLK oil and gas reservoir is structural andlithological reservoir, with top gas, middle oil, bottom water, controled by the tectonic andlithologic. Analyse the reason of low-resistivity from seven aspects: structural amplitude, rockthickness, bound water saturation, water salinity, the clay minerals of reservoir, pore structureand reservoir conductive mineral effect. |
