The exploration potential of shale oil reservoirs in Jiyang depression, Bohai Bay Basin:

Revaluations based on old oil wells data

Abstract

Reevaluations of original oil well data are an effective method for fine reservoir evaluation. In this study, two methods of generation conditions and hydrocarbon expulsion characteristics are used to reevaluate the data of five original oil wells in Shahejie Formation Lower Third Sub-member (Lower Es3) and Upper Fourth Sub-member (Upper Es4) of Jiyang depression, Shahejie Formation, Bohai Bay Basin. The results showed that: (1) Lower Es3 of Zhanhua sag and Dongying sag have certain shale oil development potential, however, the overall evaluation of hydrocarbon generation potential is not very high; (2) in Zhanhua sag, the hydrocarbon expulsion peak appears in Lower Es3, while in Dongying sag, the hydrocarbon expulsion peak occurs in Upper Es4; and (3) among the five oil wells, the hydrocarbon expulsion peak of Y187 Well overlaps with the positive value of hydrocarbon generation potential evaluation, and the reservoir thickness in the enrichment area is relatively large, which has a good development effect. The evaluation results are consistent with the actual development situation, which makes up for the weakness of previous shale oil reservoir research in this area, and has a certain reference value for shale oil reservoir cognition.