Comprehensive Evaluation Of Well Logging Of Stream And Bar Sandstone Reservoirs In The Es₄ Of Gao89 Block

Gao 89 block is a Stream and bar sandbody of Shore-Shallow Lacustrine. The lithologies mainly include sand, limy siltstone, pelitic siltstone, brown-grey nonuniform interbedding oil shale and so on. The Stream and sand body distributes around the bar body and there is much sand but the sand bed is thick. Lake wave elutriation make the storage ability of reservoir is better and the log and testing showed that the petroleum accumulation gradation is high. Because of the low resolution of the conventional logging information, it's difficult to divide the oil layer and dry layer. Combining logging with other primary information we form the identification and quantitative evaluation techniques for the Stream and-bar sand reservoirs.This research demonstrates:Imagery logging information plays a great role in calibrating the convention logging, identifying lithology and their combined modes and delineating reservoir exactly having nonreplaceable advantage against other logging technologies. According to the lithologic character, physical property and profile distribution, we divided the reservoirs into three classes and five subdivides. These conclusions provide method criterion for thin alternating beds interpretation in future and form an effective Stream and bar sandstone log interpretation technique series. Microelectrode curves have higher resolution than other convention logging curves. Although the microelectrode curve present minus difference, the reservoirs have definite deliverability, particularly in high pressure low permeability layer. It is not the finally index curve of dry layers and on the contrary it can preferably identify reservoirs.Stream and bar sandstone reservoirs logging evaluation scheme and methods are used in reservoir secondary evaluation in Gao89 block of ZhengLiZhuang oilfield in 2006. Through researching the threshold of available reservoir, we delimit the inferior limit of lithology, physical property and thickness. After well testing, we find that the interpretation oincidence rate is raised from 77%to 90%. This is mainly profitable from the knowledge transformation of dry layers to oil layers.