The Reservoir Evaluation And Development Technology Of Non-Sandstone Reservoirs Between Salt Beds In Qianjiang Depression

Non-sandstone Reservoirs between salt beds are very rare not only at home and abroad, but also very important to the sustainable development of Jianghan oil field. It is still at the stage of the scientific research and field-tests on non-sandstone reservoirs between salt beds. We urgently need to develop a set of suitable technology, used by decision-making of the development of Non-sandstone Reservoirs. Some basic researches have been done in this paper, focus on reservoir evaluation, reservoir stimulation, completion, and development scheme etc. Some primary achievements have been gained.As for the reservoir evaluation, at first, started with basic data such as core analysis, geological, mud logging and well logging, the standard of lithology identification has been established by the study on core location and rock-electricity relation; The second, based on the lithology analysis, some changes in law of sedimentary microfacies have been showed in the sedimentary environment, muddy glauberite faces and muddy dolomite faces in six kinds of lithology are good to trap oil-gas. The third, according to the analysis of reservoir space type, reservoir types are divided into three types: pore type reservoir, fracture type reservoir and fractured-porous reservoir, which have different logging response characteristics. The last, the standard of welllogging interpretation was established by the study on reservoir identification and reservoir evaluation, oil reserves in place was calculated as 1152×10~4 t, and used for the studing oilfield development scheme.As for The development technology, at first, sensitivity test proved that stress sensitivity is bad for the reservoir development. So pressure control must be carried on to avoid reservoir damage. The second, three kinds of the compliton types, short open-hole complirion, casing compliton, casing plus expandable compliton,were suitable for the development of non-sandstone reservoirs. The third,based on the analysis of stimulation,low-damage acidizing fluid was developed for the non-sandstone reservoirs. The last, started at analysis of welltesting in different litholoies and different lithofacies, sensitivity test, waterflooding test, basic data such as core analysis, geological, mud logging and well logging, reservoir development method should be stand on waterflooding. Gas-water alternative injection can be used to enhance oil recovery.The pilot test was carried on and some good results were achieved during research.