The study of the macroscopic heterogeneity of reservoir：Taking the Heidimiao reservoir of Da 208 block in Jilin Oilfield as an example
Hu Wangshui1 Cheng Chao2 Wang Wei1 Niu Shizhong1 Peng Guohong1 Wang Donghui1 Zhang Yukun1 Zhou Ping1
(1.Key Laboratory of Exploration technologies for Oil and Gas Resources|Ministry of Education|
|Yangtze University|Jingzhou|Hubei |434023； |2.Shanghai Branch of CNOOC Ltd ||Shanghai |200030)
Reservoir heterogeneity is the main internal factors that impact the reservoirs of oil，gas，water seepage and the oil and gas recovery. The study of reservoir heterogeneity is very necessary for making clear the distribution of remaining oil，taking reasonable injectionproduction measures and improving the recovery. Taking the Da 208 Heidimiao oil formation delta front subfacies of Jilin Oilfield as an example，the interlayer heterogeneity and inlayer heterogeneity and plane heterogeneity were analyzed with the method of recognizing and comparing the barriers and interlayers，sedimentary microfacies analysis，geostatistical parameters，and Lorentz coefficient. The study shows that the Heidimiao reservoir develops three sets of stability barriers，which can be divided into 3 layer series of development； the interlayers develop in the all single sands，the injectionproduction wells that the interlayers divided should be classified as different well pattern； the heterogeneity is obviously impacted by sedimentary microfacies，the heterogeneity of subsea river channel and mouth bar microfacies is the strongest； the studies of geostatistical parameters and Lorentz coefficient have shown that Heidimiao reservoir 10 single sands are highly heterogeneous，and statistical parameters often deviate from the strong heterogeneous standard far，while the Lorentz parameter values distribute between 0 and 1，more intuitive and quantitative to show the strong and weak of the macroscopic heterogeneity of reservoir.