Reservoir Evaluation And Research On The Development Mode For Xinglongtai Buried Hill Belt

Xinglongtai buried hill belt is a major fractured buried hill reservoir and production capacity construction block discovered in Liaohe oilfield in recent years. The reservoir is deeply buried, has large oil-bearing relief and interior faults within the buried hill and complex reservoir lithology. These characteristics decide the difficulty of research on such reservoirs. Based on rock mineralogy, tectonics and petroleum geology, this research employs multidisciplinary methods including geology, seism, logging and reservoir engineering to conduct comprehensive geological study on aspects of the fault system of the buried hill structure, subdivision of formation lithology, reservoir identification and evaluation by using fine structure interpretation through litho-electro combination and logging-seism combination, Archaeozoic lithology subdivision through measuring zirconite age and rock (cuttings)section, and fractured reservoir assessment based on core and production test data by applying conventional and advanced image logging, thus formed the research method and technological means for buried hill reservoir evaluation. The research indicates that the buried hill belt in this area comprises double structure of both Archeozoic and Mesozoic, lithology composition and structural features are different in different regions. The lithology of the Archaean rocks include metamorphic rocks and magmatie rocks, which are subdivided twenty-five types.The type of oil reservoirs in Xinglongtai buried hill belt is considered to ultra-thick massive fractured reservoir. The reservoir development plan is optimized with the help of numerical simulation techniques based on reservoir engineering theory combining with new drilling techniques in accordance with the reservoir speciality. Joint development by diversified well types of complex well structure, tridimensional well pattern of inter-section superposition and intra-section staggering, and water injection into bottom section have been determined through innovation research and preliminary practice. This research provides referential experience for the development of analogous reservoirs.