High Resolution Sequence Stratigraphy of Silurian Strata in Tazhong Area

Abstract

According to the fundamental principles of high resolution sequence stratigraphy, this paper focused on the application of high resolution sequence stratigraphy to Silurian strata in Tazhong area. Based on the comprehensive study of logging, drilling and seismic information, the high resolution sequence boundaries of Silurian strata and two scales of datum level cycles (long-term and intermediate-term) can be recognized in Tazhong area. Seven chronstratigraphic boundaries can be recognized in Silurian strata, including four sequence boundaries, which were the transformation from datum level falling to datum level rising, and three flooding surfaces, which the transformation from datum level rising to datum level falling. The Silurian strata in Tazhong area can be divided into three third-order sequences which correspond to three long-term datum level cycles, and 11 fourth-order sequences (parasequence sets) relating to 11 intermediate-term datum level cycles. The classification aforementioned can much better solved the corresponding problem between the six lithological sections of Silurian strata and sequence formations, finally establishes the high resolution sequence stratigraphic framework of Silurian strata in Tazhong area.

Fine dissection of meandering river sand bodies under dense well nets

“…XB Development Zone is a new type of anti-salt polyflooding promotion block, and the degree of sand body cutting and stacking is different, and the internal connection degree is different, resulting in large differences in the residual oil in different sand bodies. he main reservoir PI1 and PI2 oil layer sand bodies in Q area are mainly dominated by the delta front margin and the delta diverted plain [7], and under the guidance of the principle of sequence stratigraphy, the PІ oil formation in the northern part of the Changyuan X oilfield in Daqing was finely divided and compared with the sedimentary time units, and the isochronous stratigraphic lattice of the target layer was established [8]. The logging facies model was established by identifying the logging data under the guidance of the sedimentary model [9].…”