APPLICATION OF HIGH-RESOLUTION SEQUENCE STRATIGRAPHY ON A BEACH-BAR SYSTEM, LAYER B0 OF THE MEDIUM SUB-MEMBER OF SHAHEJIE FORMATION, MD OILFIELD, CHINA

To enhance the resolution of reservoir recognition and predict the remaining oil in the MD Oilfield, high-resolution sequence of layer B0 of the Medium Sub-member of Shahejie Formation in MD oilfield was divided on the basis of high-resolution sequence stratigraphy, theory of base level cycle, cores and electrical logging data. As a result, higher base level cycles were recognized as a long-term base level cycle, 3 intermediate base level cycles and 9 short-term base level cycles. In addition, the regional stratigraphic framework was established. Two kinds of short-term base level cycles were identified: shallowing-upward non-symmetry (type B) and symmetry which first deepen upward then shallow upward (type C). On this basis, a sedimentary model of beach-bar was built.