Fluid Identification Study On ShuangEr Layer Of MoLiqing Defaulted Depression In Yitong Moliqing Basin

YiTong basin is located in the central Jilin province.It is a double faulted and largesubsidence basin. The source is sufficient both sides of basin. Sedimentary fast rate,leading tochange quickly. The study area Moliqing fault depression is a secondary structure unit inYitong basin.Its main purpose layers is Eocene Shuangyang group. Reservoir in ShuangErpart is the main layer of study groups.The reservoir lithology is mainly glutenite, pebblysandstone, mud (ca) sandstone, pebbly silty sandstone.The main reservoir and hydrocarbonbearing section are formed by a plurality of graded and reverse graded cycles.Submarine fan is the main type of sand body development Moliqing rift. The lithology ismainly:1) sectors conglomerate of particle diameter, poor sorting, complex compositions;2) lithology is relatively single.The gravel rock, pebbly sandstone and Siltstone have betterpore structure in a sector;3) the mud(ca) silistone of fine, the heavier mud, low porosity andlow permeability characteristics. On the basis of composite calibration, logging data andconventional logging data, we work on the qualitative analysis of log response reflecting theability of different lithology, research and analysis various lithology logging responsecharacteristics, the introduction of deep lateral resistivity curve and natural gamma curvecorrelation parameters, the use of the geological parameters and log curve values closelyrelated to the main lithology identification. By cross plot analysis, clustering discriminantanalysis techniques such as establishing discriminant function, we realize the conventionallogging data of lithology identification. Lithology identification in the mudstone,calciumrocks, gravel rock, fine sangstone, siltstone and other five kinds of lithology are realized. Therecognition accuracy is85%or above.The log response is the comprehensive reflection of the rock lithology and fluidproperties.The characteristics of strata lithology is complex, leading to widespread theoil-water layers and high resistivity water, fluid identification difficult.Therefore, in the highaccuracy based on lithology identification, it is a more suitable approach that establishingidentification of oil water is based on lithology.Firstly, the paper is based on analysis of the data sample experiment inMoliqing area.Through the histogram technique analyses Distribution characteristicsof effective porosity, permeability and other geologicalparameters of mudstone,calcareousrocks,sandstone,fine sandstone and siltstone.And using crossplot technique analyses theinfluence of matter and calcareous cement complex mud in lithology of reservoir pore permeability characteristics.Secondly, combined with the analysis data of the rock oil, thepaper sum up Various kinds of lithology and physical property and oil-bearing propertyrelation and rule. Thirdly, using logging curve and the twists and turns of the resistivity curveand curve overlapping method qualitative analyses log response characteristics of the typicalreservoir,oil-water layers,water layers and high resistivity water layers. The paper establish acomplex fluid identification chart about conglomerate, sandstone and siltstone by using thecrossplot method.The chart coincidence rate has reached more than80%.In fourth, thesufficient analysis in lithologic slice data of high resistancelayer, the study has found that thecomplex lithoclast is caused by water bearing layer of high resistance factors.This paper hasestablished the induction resistivity logging value/rock resistivity and deep lateral resistivityidentification chart. This method identifies the high resistance water layer.