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Detailed Reservoir Architecture Analyses of Mouth Bar in Shangyi Block of Shanghe Oilfield, Huimin Sag(PDF)


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Detailed Reservoir Architecture Analyses of Mouth Bar in Shangyi Block of Shanghe Oilfield, Huimin Sag
GUO Jing-xing SONG Xiao-qian WANG Si-wen GUO Yun-long PENG Xue-huan
1. School of Geosciences, China University of Petroleum, Qingdao 266580, Shandong, China; 2. Linpan Institute of Geology, Shengli Oilfield Company, SINOPEC, Linyi 251507, Shandong, China
mouth bar reservoir architecture interface hierarchy vertical evolution the second member of Shahejie Formation Shanghe oilfield Huimin sag
After nearly 40 years exploration, the development of petroleum reservoir in Shangyi block of Shanghe oilfield, Huimin sag becomes much more difficult. In order to find the distribution of remaining oil, based on the abundant core and well logging data, the mouth bar reservoir in the third and the fourth sand groups of the second member of Shahejie Formation was analyzed for many aspects, including the grading system of architecture interfaces, the identification and characteristics of a single mouth bar and the vertical evolution law. The results show that the mouth bar reservoir can be classified into 5 grades architecture interfaces; the origin types of the fifth and fourth architecture interfaces are flood shale and argillaceous layers, respectively; the origin types of the third architecture interface are sedimentary with poor physical properties and diagenetic calcareous sandstone, and can be further subdivided into shale interlayer, calcareous interlayer and transitional interlayer; the shale interlayer has more lateral continuity than the calcareous and transitional interlayers in the third architecture interface, and can extend for 300-800 m; along the progradation direction of mouth bar, the dip angle of interface in the slope break belt can up to 8°, while the dip angle is less than 2° in the flat terrain; along the vertical provenance direction of sandbody, the dip angle of interface is generally below 1.5°; four identification marks recognizing lateral boundary of single mouth bar include that the top surface altitude difference of reservoir, the appearance of interval zone of mouth bar deposits, the fringe of two mouth bars overlapping each other and the existing difference from curves and deposition thickness of sandbody; the fluctuation of base level controls the superimposed relationship of sandbody, and determines the deposition thickness of mouth bar sandbody and the physical characteristics of reservoir. This results have an important significance in guiding prediction of the remaining oil’s distribution in Shanghe oilfield and other similar oilfields.




Last Update: 2016-06-02