The Study On Fine Geological Characteristics And Reservoir Evaluation Of Fine Geological Feature Of Yan 10 Reservoir In Maling Oilfield M Area, Ordos Basin.

Maling oilfield M area is located in the South-western part of North Shaanxi slope, Ordos basin, the main development sequence is Jurassic Yanan formation: Yan 10 reservoir. With the development of oil field, geological research in the study area is weak, causing problems for identification of oil-water layers, can’t keep up with development needs of oil field,so based on these,studies have been developed on fine geological feature of yan 10 reservoir,which lay a solid foundation for further exploration and development work.This paper research the yan 10 reservoir, base on the geological information,rock information,logging information and production dynamic information,we first carry out the research of formation division and comparison,establishing precise formation comparison frame, which reveal micro constructions features of the top of sand body, and analyze plane exhibition features of sand body thickness;then carry out electric property features research, reveal distribution features of reservoir electric property, analyze electric property features, then the model research of reservoir parameter explaination was carried out.Based on four properties relationship analysis, logging explaination models have been established on four properties.After those, carry out deposition micro phase and heterogeneity research respectively for detailed description of deposition features and heterogeneity features in study area.Last carry out flow unit research based on the reservoir features. Divide the reservoir for different flow units and use dynamic datas to validate the results.Studies show that Yan 10 reservoir develops two small layers: yan 101 and yan 102 among which yan 101 is the major reservoirs. each oil group in yan 10 belongs to west single oblique construction, with part of saddle-like uplift, the tendency is east–west and in different layers this construction has inherition, but the lower part of construction changes larger in amplitude, sand body is overall connected good in the plane, banded exhibition from southwest to northeast,ductility is good, from the source area in the southwest close to central sand body thickness is big;the yan 10 reservoir porosity is 15-18%, average porosity is 16.7%,permeability is 8.6×10-3μm2. Permeability and porosity are correlated in yan 10 reservoir, their plane distribution trendency are very similar, physical properties are best in central area; sedimentary facies in yan 10 reservoir are mainly bank deposits, natural levees, floodplain deposition. Yan 10 reservoir and hydrocarbon distribution are under the influence of meandering River deposits was banded distribution from southwest to northeast, disappear in northeastern river channel; the heterogeneity of yan 101 is weak, yan 102 strong. the yan 10 reservoir are affected in plane distribution by construction, deposition micro phase, and heterogeneity significantly, along river direction, especially in the central of study area oil contained saturation degree is high; take parameters from rock-taken wells,like porosity, permeability, and flow layer index,for samples cluster analysis, based on these judge nonrock-taken wells, divided into three classes: classⅠ, class II, and class III flow unit which can integrated reflect reservoir storage, seepage,the oil and gas contained and so on.