Oil & Water Identification And Log Interpretation Method Researching For Southern Steep Slope In Biyang Depression

Southern actic region in Biyang Depression is located at southern faults inside, close to the northern oil source area, with excellent conditions for oil sources.The Pingshi sand from the southwest, the Yangqiao sand from southern and the Liyuan sand from southeastern extended into north oil source area, which the large sand and the nose structure configurated to lithologic updip pinch out traps,the small sand formed glutenite Lithologic traps by property blocking of roots, provided favorable oil gathering place.Bi310,Bi301,Bi320,Bi304 oil-blocks distributed from west to east.In this region, Reservoir lithology Particle was coarse and mixed, with poor sorting, low rock composition and structure maturity.The reservoir lithology and physical changed from middle porosity and permeability in top to low porosity and permeability in bottom, and distributed unevenly in the surface. the reservoir are mainly distributed in the Paleogene Hetaoyuan group,with heavy oil in shallow formation, generally oil in middle and volatile light oil in deep, which the formation water type was heavy sodium bicarbonate.Now, showing was found in southern actic region of Biyang depression, a part of wells have high oil stream, displayed excellent exploration prospect,but have many difficulties in the logging interpretation process such as diverse reservoir, complex lithology (sandstone, conglomerate, gray sandstone, gray shale), the electrical resistance by rock have more influence than by oil, sand connectivity is poor, chaotic relationship between oil and water, oil-dry boundary is not clear, oil-water layer is not obvious in electrical characteristics. In order to explained preferably reservoir distribution, improved the ability to identify reservoir, served for the research and production services, then decided to carry out the research topics of "oil&water identification and log interpretation method research in southern steep slope of Biyang Depression".This paper carried out the reservoir characteristics and relationships between four-propertis of logging, founded interpretation model of reservoir parameters for the main lithology, qualitative or quantitative distinguished reservoir by using multiple logging curves overlap and clay content, studied lower limit of net reservoir with coring and mud logging data, analysed logging data,found log characteristics of typical oil and water layers,build oil saturation interpretation model and identification standard of oil-water. Finally, this research applicationed to the logging interpretation work in southern actic region in biyang depression, and achieve better results.