The Gas Bearing Analysis And Reservoir Modeling In The South Of Yulin Gas Field Of P_1s2

Reservoir is defined as a place to accumulate oil and gas or a object of hydrocarbon bearing pool empoldering,which is focused by oil & gas explore engineer invariably. Establishing fine reservoir geological model is not only the final result of gas reservoir description, but also the basis for developing reservoir efficiently. The gas field of P1s2 in the south of Yulin is the main purpose which is low porosity and low permeability sandstone reservoir. Now gas reservoir is under development. With explor natural gas in the large area at the same time, there have been water production wells. As the large reservoir area, river parting, moving and diversion frequently, which cause the sandstone reservoir horizontal change tempestuously, complex geological condition and aeolotropism strong. So it's necessary to make overall evaluation of the purpose layer on the field.Considering the geologic characteristics and using the software of geoloy modeling-Petrel, stochastic modeling technique is used to establish the geologic model of P1s2 gas reservoir including tectonic, strata, and reservoir parameters (porosity, permeability and saturation) of zone that is divided S21, S22, S23 frone top to down. On this basis, analyse the gas bearing and the distribution of sand body characteristics of P1s2, then make a classification of reservoir evaluation. The results show that S23 zone is the main gas formation in P1s2. With the relatively wide distribution and thick of sand body, cause the reservoir property relatively good. Oppositly S21 and S22The sedimentary facies of P zone have little and thin sand body, fine particle size of rock, poor reservoir property. 1s2 reservoir is formed by braided distributary channel sediment and developing intrafacies of delta plain in general. Sand body remains in banded distribution from north to south.North part is thick while south part thin. By extending to east and west ends the sand body becomes thin or piching,nevertheless it has good connectedness in all. In the study areas,reservoir mainly develop quartz sandstone, lithic quartz sandstone and lithic sandstone. The reservoir space contain intergranular pore,intercrvstal pore,emposieu and so on. Identify the gas zone and water zone of the study area by logging parameters. Net gas keeps main part of gas pool.In southwest a little edge water is discovered with about -1785m gas/water contact(GWC). The reservoir is part of close sand reservoir with low-porosity and low permeable sublayer.Porosity ranges from 1-15%,averaged at 5.44%.Permeability ranges from 0.0037-234×10-3μm2,averaged at 7.48×10-3μm2.The samples with permeability more than 10×10-3μm2 only number 12% of all.In conclusion the reservoir has bad pore configuration and strong heterogeneity.Through research, sand body and reservoir parameters dimensional distribution of P1s2 gas reservoir have become clearer than before. As the use of low gas, producing a smaller scale, currently the development of gas production capacity is in construction phase and the production potential is large. The study provide a reliable basis for the field application, especially for the formulation of development programs, reasonable well spacing, strictly control the production of measures and so on.