Conventional Logging Data Processing Technology And Applications In Sandy And Clay Formation

The Qikou sag locates in The Dagang Oilfield of the Bohai Bay Basin。After years of exploration and development,we identified that the reservoir type was even complex, which usually presented lithologic reservoir and construction of reservoirs jointly controlled oil and gas distribution;Construction on the reservoir in the same type, it included the typical pure sandstone reservoirs, muddy siltstone reservoirs, high levels of calcium carbonate reservoir, the reservoir conglomerate, pebbly sandstone,etc;it has the coexistence of low resistivity reservoir and high water blocking layer on the electrical performance; it has pore structure type in the performance of complex pore structure; it have been unable to meet the complex Qikou depression Reservoir Evaluation using single conventional evaluation methods.Port for the evaluation of problems Qikou Depression,The first layer Qikou depression each reservoir using core particle size, clay content, lithology, clay content, porosity and permeability of the histogram and some wells in mercury NMR data confirmed that next of Formation Reservoir lithology is mainly lithic quartz feldspar fine sandstone, its mineral composition dominated by feldspar, quartz, lithic second; moderate clay content, content in the 5-15% or less, the cement is mainly clay cementation, out of town, the reservoir is mainly montmorillonite clay minerals plus kaolin;Reservoir poor sorting, structure and composition with maturity of less obvious features; permeability of roughly 1～100×10-3μm2 range. Evidently, the majority of the town of Sandstone reservoir is high porosity-in and permeability. Similarly, the analysis showed:Guantao Formation sandstone reservoirs are mostly high porosity-in and permeability; out of town group and the conventional reservoir reservoir Guantao group mainly has low resistance between oil development; Dongying Formation sandstone reservoirs Most are in the hole layer-low permeability reservoirs;most of the sandstone reservoirs are in the low porosity-permeability reservoirs; Shahejie most sandstone reservoirs are low porosity-permeability reservoirs; sand most of the three sandstone reservoirs a low porosity-permeability.Complex reservoirs requires an effective interpretation and evaluation methods to improve the interpretation of success. This created a new set of conventional data processing procedures:First, a preliminary calculation of logging data and core analysis of petrophysical parameters result, type of reservoir and fluid nature of the recognition, the basis, select the appropriate model of porosity and permeability full explanation explained.Finally, Forward software platform, summed up the information at home and abroad conventional logging interpretation methods and models suitable for the preparation of a shale formation reservoir in Dagang district type, fluid identification, reservoir rocks accurately calculate the physical parameters of the procedure.On 22 new wells in the region to explain the test data to verify through achieved good effects.