The Research About Four Properties Of The Chang2Reservior Of The ZL Oilfield

Zhiluo oilfield located in southeast of the Iraqi Erdos Basin in northern Shaanxi slope,constructed as a flat area west-dipping monocline dip less than1°, per kilometer gradient of7-10m, the internal structure is simple, local compaction may be due to differences in lowamplitude formed nose uplift; The significant feature of this area is constructed by structurestability and undevelopment of local structures.Therefore, this article from logging data, combined with drilling, logging, core,laboratory analysis, well logs and other geological data, To research the construction ofreservoirs, reservoir properties and their internal fluid characterization and properties of fine-integrated; deepen the Research of reservoir lithology, physical properties, oil resistance andelectrical changes, and establishing the geological characteristics of the4properties relations,to explained the study area reservoirs standards for reserves to provide a reliable calculationof the effective thickness, effective porosity, other major oil saturation calculationparameters to meet the low permeability reservoir oil well logging reservoir evaluation fromall of this to meet the needs of expandition of oil and gas exploration.By contrast strata division and an overview of the study area can mainly knowstratigraphic sequence, facies changes in lithology and stratigraphic thickness, to identificatethe reservoir distribution and connectivity, provide the basis for seeking favorable oil and gasareas and rational development of oil and gas fields. zhiluo oilfield chang2section ofsedimentary facies types is lakes-delta chang2strata can be divided into chang21tochang23, etc.3sedimentary cycles. Chang2sand sandstone gray, gray-green and dark graymudstone; developed parallel to bedding and massive bedding; lithology is fine-grainedfeldspathic sandstone; porosity is mainly intergranular pores, followed by grain the solutionpores; mainly porosity range of2.19%to18.4%, with an average of12.8%; penetrationmainly range of0.12~9.63×10-3μm2, the average of1.85×10-3μm2, low porosity reservoirs,special low permeability reservoir; length2reservoir is low oil saturation of reservoir; initial oil saturation was33.0%, with an average water saturation of65.0%. According to theevaluation criteria, can be divided into the reservoir of Yanchang Formation chang2Ⅰ, Ⅱ,Ⅲ, Ⅳ Four grades, chang2Class Ⅲ reservoir rocks are mainly developed for lowporosity and very low permeability reservoir.