Abstract: Systematic analysis and study is conducted on the difficulties in the sedimentary system in the lower part of Es1, reservoir characteristics, and logging evaluation of main target formations in the west slope of Qikou Sag. This is helpful to determine the exploration direction and target of the area. Taking the geological characteristics of Liujianfang area as an example, based on analyzing the sedimentary source, sedimentary characteristics and reservoir characteristics, effective identification of reservoir lithology is proposed to be conducted on the basis of drilling core data and cross plot method to solve the difficulties in evaluating micritic calcite dolomite reservoirs and calcarenite reservoirs. A set of effective approaches to evaluating such kind of reservoirs are developed based on the effective identification of hydrocarbon zones by using the method integrating mud-log and gas-log, the method integrating mud-log, gas-log, and image-log, the MDT testing technique, and the reservoir comprehensive evaluation method. Remarkable results are obtained by applying the newly developed approach to conduct a new round of fine reservoir evaluation of new and old wells in micritic calcite dolomite reservoirs in the lower part of Es1 in the west slope of Qikou Sag, which further proves the feasibility of the approach

Key words: Huanghua Depression, west slope of Qikou Sag, micritic calcite dolomite, various information, fine reservoir evaluation, application result