The Study Of Reservoir Description And Remaining Oil Distribution In Tiger 10 Oilfield Block

After many years of water injection development, the vast majority of domestic oil field has entered the middle and high water stage, more than 60% of the remaining oil remains underground. Restricted by geographical environment, the difficulty of exploration continues to increase, looking for the new development area is becoming more and more difficult, high combined water cut, exploitation degree is high, recovery rate is low, and the grim situation led to the oilfield exploitation become more and more difficult. Therefore, vigorously promote the large-scale reservoir description, understand the distribution of remaining oil, through adjustment and comprehensive management, increasing recoverable reserves, slowing the rate of decline, maintain the relative stability of the old oil fields is the fundamental guarantee for the sustainable and stable development of China’s oil.Tiger ten block is located in Huanjiang oilfield central, built in 2011 production, mainly exploited horizon for Chang4+5 layer, influenced by tectonic movement, the storage layer lateral variation, underground oil and water relative relationship is complex, storage layer plane distribution difference larger, single well high water cut, low productivity and some oil wells in production greatly decreasing problems exist in the process of oil exploration and development. In this paper, the integrated use of sedimentology, structural geology, petroleum geology, seismic sedimentology, logging geology theory, from the stratigraphic division and correlation, rock characteristics analysis and sedimentary facies analysis of fine reservoir description of the study area, analysis of the sedimentary evolution, reservoir heterogeneity and the reservoir of classification and evaluation, and established the three-dimensional geological model, in the final analysis the residual oil distribution rules and establish favorable potential area with, and puts forward corresponding measures for tapping potential, to increase production efficiency.The cycle method, mark layer, such as thickness method, such as elevation method, combining with coring well data, seismic and logging data, in the region of unit time comparison and division of work, establish logo layer identification mark in the area within the scope, to establish the standard profile skeleton, in mark layer under the constraint, were used in sub layer of the oil group, stratigraphic framework of the whole area closed for the high resolution sequence stratigraphy is established.To establish precisely based on the stratigraphic division and correlation of the carry out time stratigraphic frame type of reservoir sedimentary microfacies characteristics of lattice, from within the area of coring well data of, based on previous research, synthesis of the core, electric logging measured curves and the results of seismic sedimentology in that the study area mainly developed delta front subfacies sedimentary facies, sedimentary microfacies subdivision for shunt channel, channel flank and shallow lake mud mainly. At the same time, the sedimentary facies model of the study area was established based on the research results of the plane and profile distribution of sedimentary facies. Through the study of reservoir characteristics. It is found that the area within the reservoir size distribution is more fragmented, different regional non heterogeneity has a great difference. So we set the reservoir classification and evaluation standard, the reservoirs are divided into three types, type I and II reservoir usually developed in the main river channel, located under water flow channel microfacies, class III reservoir is usually distributed in the channel side or end and poor physical property. On the basis of fine geologic research, the 3D geological model and sedimentary facies model of the study area are established by stochastic modeling theory.Tiger ten reservoir layer development zone fine 3D geological model is based on the basis of the integrated use of lithology, well logging, production data, through the modeling software petrel, combined with a deterministic modeling and stochastic modeling method, using artificial interactively processing of sedimentary micro facies modeling, using phase control technology on physical parameters using sequential Gaussian simulation method to simulate, the establishment of the development zone of quantitative three-dimensional geological model, and evaluation and selection of sedimentary micro phase and parameters of the model. Finally, the comparison between the simulation parameters and the original input data, the comparison of the slice and the porosity model, the model and the method of hand drawing plane distribution contrast, the reserve fitting method are analyzed.On the basis of the above research results, a comprehensive analysis of the the residual oil distribution rules and statistical classification of remaining oil, divided the remaining oil favorable accumulation area, also of injection production well pattern control unit are analyzed, put forward corresponding measures for tapping potential of remaining oil, oilfield further exploration and exploitation and improve oil recovery provides reliable basis for.