Characteristics And Distribution Of Reservoirs In Jiaji - Jiayi - Upper Reservoir

Research work area at the Silurian source depressions,JialingjiangFormation hydrocarbon source mainly from the Silurian, have enough hydrocarbon source,ground exposed Shaximiao Formation of the Jurassic, the cap rock are integrated, and the storage conditions are good. Several sets of reservoirs develop in longitudinal have better physical properties.Whilldrilling,blowout, well leak,etc,oil and gas shows in general. Work area in Jialingjiang Formation have the large of controlled gas reserves but low degrees of proved reserves,potential of exploration is high.In this paper, well drilling, logging, seismic data and a variety of experimental tests,were taken to studying the stratigraphic division and correlation, sedimentary facies and reservoir characteristics of the study area. Jialingjiang in the study area during the carbonate platform, developed the open and limitation platform platform facies. Jialingjiang Formation experienced three sea-level changes in its sedimentary evolution, three transgression scope and relative sea level height, gradually decreasing and decreasing trend. Although the study area Jialingjiang Formation sedimentary vertical differentiation has obvious stacking cycle characteristics, but the distribution of the plane, doesn’t have so simple regularity, sets the reservoir cap is deposited on the plane with more frequent changes and differentiation.Based on the basic characteristics of the Jialingjiang Formation, in accordance with the development of sequence stratigraphy theory, three profiles were selected to study. With comparison, we find the study area developed sets of stable marker bed, have clear stratigraphic boundaries easy to compare. Study area of Jialingjiang Formation reservoir rocks include:granular limestone, granular dolomite and powder-microcrystalline dolomite.Jialingjiang Formation is low porosity and low permeability reservoir,82.39%of the porosity of the sample is less than2%, a porosity greater than6%to about3.3%, only about6%of the sample permeability was found to be greater than0.1×10-3mD. Jialingjiang Formation can forming the local high porosity and high permeability intervals with the role of cracks. Jialingjiang Formation reservoir were determined that low porosity and low permeability reservoirs. Reservoir space of the research area reservoir layer have diverse types.Comprehensive analysis, reservoir space mainly secondary porosity or holes, in addition to caves and cracks reservoir space are also developed. With comprehensive judgments, the main types of Jialingjiang Formation was fracture-pore reservoir.Jialingjiang Formation reservoirs in the study area is divided into four categories, the most developed reservoirs is T1j12-T1j1上, followed is T1j22. According to the results of the Jialingjiang Formation single well logging interpretation.In the study area of the reservoir section pick out three profiles, comparative evaluation of reservoir, to summarize the distribution of reservoir. Jialingjiang Formation in this area to carry out the evaluation of favorable development goals.