Study On Recognition Method Of Low Resistance Reservoir In Huanxiling Oilfield

HuanXiling oilfield in the western depression of Liaohe depression in south central section, the reservoir type is rich, has the conventional structural reservoir, lithologic reservoir, stratigraphic reservoir, also the regional distribution of the existence of low resistivity reservoirs of oil and gas pools formed part of the test, industrial oil flow to see the oil production test wells, from the current research results, with the exploration and development potential certain. In the study process of this kind of low resistivity reservoir in, summarizes the research and method for the identification of a set of system.First of all, starting from the causes of the low resistivity oil layers, low resistivity reservoir in Huanxiling oilfield mainly has two aspects of geological origin and physical cause. One is the geological origin mainly refers to the fault trap formed by tectonic action, micro anticline traps or lithologic trap, if this kind of trap structure amplitudes were lower, oil-bearing height is not very high, oil-water differentiation is relatively poor, low oil saturation, easy to form a low resistivity oil and gas reservoirs. The two is the physical cause mainly refers to the reservoir internal factors(high bound water saturation, additional conductivity of clay), external factors(mainly refers to the drilling fluid invasion) composite factors and other conditions.The second is based on the systems analysis the characteristics of low resistance reservoir in different blocks: one is the effect of regional tectonics, Huanxiling oilfield in the edge of the basin, trap oil-bearing low amplitude, so the reservoir has characteristics of low amplitude trap(60-100m), low oil saturation(50-55%), displacement pressure is less than 0.15 MPa, small the oil-water density difference(0.15-0.25g/cm3) etc.. Two in Huanxiling oilfield in the edge of the basin, which belongs to the low energy environment, with high real conditions of formation water saturation(particle reservoir rock is fine, high shale content, median grain size small, the specific surface area increased, fluid adsorption capacity). Because the pore structure variation, reducing the salinity of formation water, immobile water itself has better ability with conductive, later gradually increased immobile water saturation, reservoir resistivity reduce, if oil and gas migration to the easy formation of low resistivity reservoir in this kind of trap. The three is in the electric display data with low resistivity, acoustic slowness with large, natural gamma value increases, low oil saturation, reservoir physical property is poor(low porosity and low permeability) characteristics.Finally the summary of HuanXiling Oilfield low resistance reservoir research methods:accumulation model analysis of comprehensive application of three kinds of methods of analysis, gas combination logging identification technique and logging interpretation method of measurement. In the accumulation mode research into at the same time, oil production test data test to make full use of the adjacent blocks obtained industrial oil flow well, sedimentary environment and reservoir properties compared with the types of reservoir. Two the establishment of logging interpretation and logging data model by use of gas, two times to understand and evaluate the necessary for low resistivity reservoir, resulting in a set of hidden rules of use, gas logging additional identification and interpretation of logging low resistance reservoir recognition technology integrated application model.