Study Of The Reservoir Evaluation On Chang2 Reservoirs Of Yanchang Formation In Huangjialing Area Of Zhiluo Oilfield

Huangjialing area of Zhiluo oilfield is located in Fuxian,the study area covers an area of 114 km2, tectonic location southeast of shanbei slope of ordos basin.From the oil production test result, Chang2 has a good shows, indicate a good exploration and development potential.Based on the sedimentary petrography, reservoir geology and petroleum geology, geophysical well logging, and other related theory as the instruction, which is based on the advanced test method, using geological outcrop, drilling, well logging data, taking the research method of combining the macro and micro to Huangjialing area of Zhiluo oilfield Chang 2 stage study of reservoir characteristics in detail. obtained the following results and understanding.Through core description and rock thin section identification, believe that Chang 2 reservoir rock types are mainly medium to fine arkose, clastic composition are mainly quartz, feldspar and cuttings and a small amount of filler, filler content components are mainly chlorite, illite.Sandstone low compositional maturity and structure maturity are low. Sorting characteristics is Medium- sorting. On the basis of regular physical data, the results of the analysis is that Chang2 reservoirs which are low porosity and low permeability. Chang2 1 average porosity is 12.93%, the average permeability is 1.73×10-3μm2;Chang22 average porosity is 13.76%, the average permeability is 2.14×10-3μm2.According to the mercury injection capillary pressure test data analysis, think Chang 2 reservoir is given priority to with fine pore throat. The diagenesis types in of the study area are mainly mechanical compaction, cementation, metasomatism and dissolution and fracture. According to the I/S in S %, quartz, increase the level of grain contact type, pore type and comprehensive judgment index, district Chang 2 in the late diagenetic stage B period.According to the reservoir classification standard, Chang 2 reservoir of the study area is divided into four categories: Ⅰhigh quality reservoir, Ⅱ medium reservoir, poor reservoir, dense reservoir, and Chang 2 reservoir has carried Ⅲ Ⅳon the comparison and evaluation from various angles.