Reservoir Evaluation Of Fuyu Oil Reservoir In Xingshugang Field

Xingshugang zone is located in Daqing Placanticline, all the upper oil formations are tectogenesis reservoirs and the field has been in production for many years . The industrial value of lower Fuyang oil layers was discovered gradually and became the focus for evaluation in recent years. The oil layer of Fuyang reservoir is attached to low permeability and low porosity reservoir with complex pore structure, unapparent differentiation of gas and water, unobvious interface of gas and water. This paper has preceded comprehensive evaluation of Fuyu oil pay zone, and has further researched into the distribution law of reservoir systematically and deeply by using some material such as geology, logging and production test and applying the theory and technology of sedimentology, logging geology, reservoir geology, sequence stratigraphy and so on. The main points are as follows:1.Combining with previous results of the small layer partition, selected the Xing 78 as standard well and established the well tie profile covering the whole district.Carried on the fine partition and contrast for little layers and established the stratigraphic framework for the research area mainly according to the lithologic curves.2.Sedimentary microfacies were divided on the basis of the fine description of core and laboratory observation and research of numerous core chips and according to the core study of phase - log facies analysis, and the distribution rule of the sand body was determined and the conclusion was put forward that combining with the fine description of core and laboratory observation and research of numerous core chips, differentiate sedimentary delta plain and delta front and phase and underwater distributary channel sandbodies underwater distributary channel sandbodies.3.The petrophysical distribution, pore types, rock mechanics, pore and throat types and microscopic pore structures were studied through logging files handling, logging re-interpretation, core observation, thin slice analysis and mercury penetration. It is believed that the Fuyu reservoirs belong to low-porosity and low-permeability with bad petrophysical properties.4.Based on the establishment of characteristics of reservoirs and the predominant factors to control the reservoir development, according to the actual situation of the study area we chose 4 optimal parameters, including porosity, permeability, clay content and the effective thickness as evaluation parameters. Using the mercury curve type as constraints, small layers were evaluated and the reservoirs were also comprehensively evaluated5.The most favorable sedimentary facies of Fuyu oil layer in Xingshugang region is distributary channel and FⅠ2, FⅠ3 , FⅠ5 , FⅠ6, FⅡ2 are the main small oil bearing layers. As the reservoir depth increased, reservoir quality varied. Numbers and sizes of typeⅠreduced, but numbers and sizes of typeⅢa relatively increased.