Research On Gulongnan Area Of Ancient 693, 146 Block Fluid Identification Method

Gulong area south of the ancient 693, 146 block is located in Qijia Gulong sag in the south, objective layer of Putaohua reservoir by Western and Northern depositional system, reservoir changes quickly, the relationship of oil and water complex. Parts of the existence of low resistivity reservoir, oil-water layer development obviously, original submitted to proved reserves during the establishment of the standard application in existing development wells to identify oil and water rate is low, has brought great difficulties to the oil and gas reservoir identification, evaluation and perforation selecting layer. Therefore, this paper starts from the study area lithology, physical property, electrical property and oil-bearing relationship respectively from lithology, shale content, grain size, clay type, cation exchange capacity, pore structure, formation water and other aspects of GR, SP, DT and Rt curves of factors were analyzed, the influence of the situation, pointed out that the high clay content and clay mineral conductive ability, micropore water saturation is the main reason for the high and low resistance oil layer; in the mechanism of oil-water layer identification difficult based on the analysis of the construction of sensitive to fluid properties parameters of LLD/ILD, Rt/(1-Vsh), Rt* with 2 and SP/Rt, respectively. A fluid identification with DT, SP and Vsh chart, SP/Rt-DT chart, 2-SP Rt* is suitable for fluid identification in this area, plate accuracy reached 87.5%; application of core and oil testing and well logging data, the establishment of the effective thickness and electrical Standard, effective thickness of interlayer standards; by core calibration logging method were established mud shale content model, effective porosity and permeability interpretation model; Archie, Archie parameters, Indonesia model is established, and in the research foundation of the causes of low resistivity is proposed based on background conductive saturation interpretation model, through the sealed coring well compared to the calculation results, determine based on conducting background saturation interpretation model for the saturation interpretation model; total depict 34 oil-water layer wells, saturation of the same layer, mainly distributed in 30-50% area. And the calculation results of well logging saturation are used to describe the quantitative classification of oil and water in the same layer area, according to the degree of saturation of 0-30%, 30-50%, 50% or more.