Metamorphic Rock Reservoir Logging Evaluation Method Of Effectiveness Research

As the increasing global demand for oil and gas and Exploration degree of in-depth step by step, there is an increasing demand for oil and gas. Traditional to sedimentary rocks as the main target of exploration and development and the large-scale anticline, fault reservoirs which is more easily found have been basically explored and developed. Looking for a new reservoir to increase oil and gas production, has become a crucial problems facing from oil fields currently. In recent years, the metamorphic rock reservoir of bedrock reservoirs has become the target of exploration, greets each of the demands of oilfield exploration and development, which will be the focus of exploration and development in the future. Metamorphic rock reservoir belongs to a special lithology reservoir, it has complex lithology, fracture development extremely, complex pore structure, strong heterogeneity, fast face change, etc Especially crack, is not only oil and gas migration channel, and is the main space for storage, therefore metamorphic rock reservoir lithology identification and reservoir effectiveness evaluation at home and abroad, is a more difficult task. In order to fully develop metamorphic reservoirs, conducting metamorphic rock reservoir logging evaluation method of effectiveness research is particularly important.It regards mainly to our country thrive in liaoHe depression archaean group metamorphic buried hill reservoir as research purposes layer in the thesis. Using "core calibration logging technology", comprehensive well theoretical method and simulation experiment method, established the automatical lithology identification method. Through the research of metamorphic rock reservoir reservoir space characteristics and pore structure characteristics, combined the characteristics with its response features on the logging data, to make classification of metamorphic rock reservoir; Using conventional log, micro resistivity imaging logging, combined with the test and test data, to do qualitative evaluation of the effectiveness of different types of metamorphic rock reservoir Select the most relevant reservoir parameters on metamorphic rock reservoir effectiveness, combined with test data, to do the quantitative evaluation of the effectiveness of the reservoir.According to the research above, in view of the different types of metamorphic rock reservoir, we summed up a set of method suit to the work area of metamorphic rock reservoir logging evaluation of the effectiveness, and obtained the following results: (1):Metamorphic rock reservoir rock types are mainly for regional metamorphic rock, migmatite and fractured metamorphic rocks; For similar mineral composition, logging response characteristics of similar lithology merger, get seven kind of lithology logging data to identify;(2):Light-colored mineral content of more mixed granite, mixed gneiss, gneiss and neutral and acidic igneous rocks igneous rocks become the reservoir rock because of prone to fracture. The amphibolite rocks and maficigneous rocks with a lot of dark mineral content is not easy to develop into cracks and become non-reservoir rock.(3):By conventional logging data, using R/S analysis method to evaluate the fracture development situation of metamorphic rock reservoir, comprehensing acoustoelectric imaging logging data caneffectively identify and evaluate the effectiveness of crack and reservoir.(4):to comprehensive analysis and research the effectiveness of the method of the metamorphic rock reservoir, and concludes that the logging of the reservoir evaluation standards.Many factors influence on the effectiveness of metamorphic rock reservoir, Just from the Angle of well logging, this paper combined with metamorphic rock reservoir lithology and ground stress field to study the validity of reservoir and fracture. Thus we will continue on the basis of the study, from a different Angle to comprehensive consider all aspects of the factors influence on fracture and effectiveness of reservoir, so as to enrich and improve the finiteness of metamorphic rock reservoir comprehensive evaluation methods.