The Study Of3D Geologic Modeling Of Zhong City Oilfield

With the deepening production and development of Oilfields, some of onshore Oilfields in China have actually come into the high water cut stage, the complicate geological situations have been further exposed with severe heterogeneity and difficult exploitation. For the elder Oilfields, there is still a large number of remaining oil, how to describe the distribution of the remaining oil exactly is the main target of exploration and development of Oilfields. In order to achieve this goal, there are many new methods of studying on remaining oil have been appearing, and the trend of research is from single subject analysis to application of multi-disciplinary including geological studies, reservoir engineering, numerical simulation, logging methods and so on. The first step for the study of residual oil is to build accurate and fine3D geological model. Three dimensional reservoir modeling from the perspective of three dimensional space to study the reservoir quantitatively, its core is the study of reservoir through the integration of multi-disciplinary, and the realization of three-dimensional visualization. Three dimensional reservoir modeling overcome the limitations of using two dimensional maps to describe three dimensional reservoir, and is able to quantitatively characterize the heterogeneity of the reservoir in3D space. Otherwise, the simulation result of3D geological model can directly with three dimensional reservoir simulation software standards, which is useful to conduct the integrative study of geology and reservoir simulation.In this paper, the Zhongshi Oilfield located in zhe southwest of Qianjiang City, Hubei Province, Zhong City, and the structure is located in the leading edge of the Jianghan Basin, Qianjiang Sag potential Peking fault, with a bell Lake faults structure. The paper focuses on the fine geological modeling, and taking Saertu, Putaohua and Gaotaizi reservoir in this area as the object of research, applying multi-disciplinary theories and techniques including sedimentology, sequence stratigraphy and geostatistics to build the3D fine geological model on the basis of detailed geological study of the reservoir characters. The model shows the underground geological characters objectively and correctly, which also supplies references for the problems in the following progressive exploration and development, such as effective reservoir is difficult to identify, reservoir distribution or sand body connectivity is not clear,waterflooding effect is not obvious and so on. The rigion include of development fault, complicated structure, rapid changes of lithology. Because of the consult of north Qianjiang bottom wall control of the erosion surface of the disk Jingsha group off the order, lithology, structure, composite oil deposit and the overlap of the faults and lithologic complexity of surface erosion in Jinsha imbricate arangement multi-layer permeability sand reservoirs. The Zhong city Oilfield have a total of14oil groups,350oil sand bodies. The reservoir heterogeneity is very complex. Interlamination and layers have prominent contradiction. To setup exact and fine modeling could supply gel surfactant water combination drive for3D geologic model, also used for characterize production tail heterogeneity reservoir, offer reference material of later stage of production tail. Combined work area situation, we built the2nd and4th members of Qianjiang formation fine geologic model and property model to describe the distribution and heterogeneity substantially. At last we checked the exactitude of models, to provide the reliable data of the geological model for the follow-up numerical simulation. In this paper, the geological model can be used for reflecting of reservoir, physical property distribution law and providing the reliable data of the geological model. We can realize the integration of geological modeling and reservoir numerical simulation integration, to provide the basis for the development and adjustment of the Zhongshi Oilfield.1. Built fine geological model of4th and2th members of Qianjiang formation by vertical, total of9,735,540grids.2. The structure model is well illustrated the nose structure of the study area and features controlled by erosion; the use of powerful visualization capabilities of the Petrel software, calibration of various types of data errors.3. We use Petrel software to digitized all small layer of oil sand body and constrain the modeling of facies and physical property.4. For the study area, the oil sands are mostly of the characteristics of isolatedl enticular, we use a combination of certainty and stochastic simulation.5. Section hierarchy to establish appropriate physical template, use phased modeling techniques to create the porosity model; co-simulation. method to establish the permeability model; use a combination of certainty and stoc hastic simulation, establish the oil saturation model. The model conforms to the geo logical knowledge to better portray the nonuniform of the reservoir.6. We fitting the reserves of the passage (including layers), error of less than5%, small layer’s error less than10%.7. Coarsening model according to the requirements of digital-analog, Model in accordance with the plane50*50m, vertical to maintain a grid of lm, established two models of the rough, to ensure the consistency of coarse model before and after.