Reservoir Evaluation Of He8and Shan1in Sudong41-33Area In Sulige Gasfield

The characteristics of structure，deposition microfacies and sand body morphology,diagenesis，physical property and micro-pore structure of He8and Shanl reservoir inSudong41-33area of Sulige gasfield are researched at the base of test results of cast section，SEM, Xdiffraction, cathodeluminescence, grain and high pressure mercury penetration. Thenthe reservoir is evaluated and favorable areas are selected, the main results as ofllow.Several latitudinal nose uplitfs can be recognized in He8and Shanl reservoir, structureof every sublayer presents good succession. Braid river deposit develops in He8member anddelta plain subfacies grow in Shanl member. Channel bar, bed detention and distirbutarychannel microfacies are the main save fades belt. Correspond relationship between sand bodymorphology and deposition microfacies is preferable, sand body scale and thickness of He8member increase rfom lop to down, sand body of Shanj’develops more better than othersublayer in Shanl member.Lithology of He8member is medium-coarse grain lithic quartz sandstone andifne-medium grain lithic sandstone, while medium-coarsc grain quartz sandstone, coarsegrain and giant-coarse grain lithic quartz sandstone tlike the main place in Shanl member.He8and Shanl member are on the late diagcnetic stage B, compaction pressolution make theporosity of He8and Shanl member lose15.55%and14.61%，porosity decrease17.35%and18.94%because of cementation, dissolution contribute5.93%and6.04%. Emposieudiagenetic facies is more favorable than chlorite and kaolinite cement diagenetic facies,Alternation of physical property which in He8is better than that in Shanl member coincideswith sand body distirbution. Content of debris dissolved pore and kaolinite intercrystal pore ishigher, pore throat radius distribute with double or multi peak，which is affected bydevelopment degree of pore throat.The key factors inlfuencing reservoir quality are selected, macroscopy is combined withmicroscope, weight is considered. Reservoir is evaluated synthetically, I types are always inthe most favorable deposition microfacies and diagenetic facies.