ISSN 1009-6248CN 61-1149/P Bimonthly

Supervisor:China Geological Survey

Sponsored by:XI'an Center of China Geological Survey
Geological Society of China

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    Reservoirs Characteristics and Evaluation of Yanchang Formation in Zhidan Area, Ordos Basin

    • In this paper,we analyze the data of drilling cores and cast thin sections,study the petrologic characteristics,characteristics of pore and permeability,and the porosity types,and discuss the effect of such factors on oil-bearing layers of Chang-2,Chang-3,Chang-4+5,and Chang-6 in ZHidan area. The resultindicates that the Yanchang reservoir is characterized by low mineral maturity and highst ructure maturity,of which Chang-2,Chang-3,and Chang-4+5 are better than Chang-6 in mineral maturity. The physical property shows that Chang-2 is characterized by middle-sized pores and low permeability while Chang-3,Chang-4+5,and Chang-6 are very low in permeability. Reservoirs are divided in to four types by several parameters,withChang-2 oil-bearing layer containing reservoir type and Chang-6 oil-bearing layers mostly containing reservoir type-Ⅲ.
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