Research For Reservoir And Oil Layer Distribution Rule Of TheⅡ-Ⅲ Oil Layer Of The Second Member Of Hetaoyuan Formation In Dong Zhuang Oilfield

With the continues depth of the global oil and gas exploration and geological theory research, the study of oil and gas reservoirs increasing attention has been paid. Such as in recent years, the AAPG Annual Meeting has taken reservoir studies as the main directions and one of the hot spots in the study of oil and gas basins. The reservoir geology ideas, new methods continue to produce.Reservoir sedimentology increasingly from macro to micro, from theory sedimentology to the development of applied sedimentology, reservoir description and prediction are also increasingly from qualitative to quantitative development.Dong Zhuang oilfield located in the territory of the Dongzhuang village,Shayan township of Xinye County, Henan Province, structural position in center of the Dongzhuang secondary depression of the southern Nanyang depression which located in Nanxiang Basin, is a complicated fault anticlinal structure. Since the discovery of oil fields, did not carry out the system on the basis of geological research, reservoir structure, reservoir distribution, the law of the distribution of oil and gas layer clear understanding; do not form a perfect injection patterns, is still in the stage of trial mining, injection test, low-yielding low-energy well take fishing oil production, reserves of water driving a low degree. In recent years, increased efforts to adjust in the field, drilled number increased to52, the need to deepen the understanding of reservoir structure; the sedimentary microfacies study of the deposition time unit, characterize reservoir distribution and heterogeneity characteristics; injection and production correspondence analysis, do a good job of injection and adjustment, improve water injection conditions, restore the formation energy, efficient development of the reservoir.The stratigraphic sequence of Dong Zhuang oilfield from top to bottom are the Pingyuan formation of Quaternary, the Shangsi formation of Neogene, the Hetaoyuan and Dacang formation of Paleogene. Eh₂and Eh₃is the region’s major oil-bearing strata, lithology is dark gray mudstone, shale and light gray fine-grained sandstone, siltstone unequal thickness interbedded, pebbly sandstone locally developed. The deposition theory as a guide, according to the regional depositional setting, drawing on the results of previous studies, small layer is divided into52wells in the region. Stratigraphic division analyzes the key hole formation, to determine the sedimentary cycles of the Eh₂and Eh₃at all levels; to select backbone even well stratigraphic correlation profile, The backbone section hole formation segmentation and contrast under the control of the sedimentary cycle, consider the stability of the single layer of sand interval in the framing process, and, as far as possible, be divided into single sand body level; the backbone profile well closed to the backbone profile well as the standard, go to the region’s well correlation, and ultimately achieve the closure of the region stratigraphic correlation. The reservoir of Hetaoyuan formation mainly lacustrine delta deposition, the basis for the study of the regional depositional setting of Hetaoyuan formation, under the guidance of the lacustrine delta depositional model, through key wells research, single well analysis, establishment of the knowledge of sedimentary microfacies library, small layer of microfacies to all the wells. A section deposition microfacies analysis, preparation of sedimentary microfacies maps of every small layers, analysis of the area lacustrine delta sedimentary evolution and facies belts law. Use the sedimentary microfacies research, analysis of favorable facies distribution. The use of core laboratory analysis for porosity, permeability, saturation, mercury data, wettability, sensitivity and relative permeability, fluid analysis data, PVT experimental data, and provide a reservoir properties, research reservoir parameters change characteristics, research reservoir microscopic pore characteristics, study pore types and pore combination, pore throat distribution characteristics, clay mineral characteristics. Reservoir macroscopic heterogeneity study take the sedimentary microfacies temporal evolution of features and sedimentary facies model as a guide, based on the processing results of reservoir parameters, Research layer heterogeneity, heterogeneity in the layer plane heterogeneity, analysis the distribution characteristics of sand bodies, reservoir properties and the main oil sands compartment on the three-dimensional space, and in accordance with dynamic data to verify its correctness; microscopic heterogeneity mainly refers to the heterogeneity of the pore and throat, as well as fluid heterogeneity formed by rock wettability, the study integrated application laboratory analysis data of sheet, cast, electron microscopy, capillary pressure, use geostatistical methods to comprehensive analysis, and study the microscopic characteristics of the reservoir in the area. According to the research results, the choice of the parameters of the reservoir properties, sandstone drilling rate, sandstone thickness, connectivity, and conduct the reservoir classification and evaluation.Integrated logging curve characteristics and test oil, logging and laboratory analysis data to carry out the reservoir four relations of the Hetaoyuan of Paleogene of Dong Zhuang oilfield. Select reservoir parameters of the purpose layer of the key wells, formed the best conversion relationship with logs, the establishment of the Dong Zhuang oilfield lithology, physical properties and effective thickness parameter interpretation model, the digital processing and interpretation of the multi-well, reprocessed and the establishment of the explanatory model or criteria for the classification of the oil-gas-water layer, the use of software to re-log interpretation the Dongzhuang Oilfield52wells, and to study the changes in the characteristics of the oil and gas in the plane and vertical, find out law of the oil and gas in the vertical plane distribution, the preparation of oil layer reservoir thickness contour map.Dong Zhuang oilfield complex structure, reservoir sand body is changing fast, strong heterogeneity. At present, the number of oil wells larger than the number of points of injection wells, existing injection wells and oil wells corresponding to poor, oil wells in poor condition by the effect, most of the oil wells in the state of exploitation of natural energy, the formation energy is low, low oil production, oil field as a whole is inefficient business the development of the state. Through the reservoir study to figure out the laws of reservoir development.