Seismic facies characteristics and distribution of sedimentary facies of Permian Fengcheng Formation in Mahu area, Junggar Basin
Received date: 2021-10-22
Revised date: 2022-01-12
Online published: 2022-05-12
Supported by
The China National Science and Technology Major Project(2017ZX05008-004-008);the Major Science and Technology Project of CNPC(2021DJ0206)
Fan delta-lacustrine sedimentary system developed in Fengcheng Formation in Mahu area, Junggar Basin. The exploration area of multi-type oil and gas reservoirs is closely related to the distribution area of each sedimentary facies belt, and the wells drilled in Fengcheng Formation are relatively limited. It is of great significance to predict the distribution of each sedimentary facies belt by using seismic facies analysis technology. This paper conducts a comparative analysis of downhole core, logging response, single well sedimentary facies and seismic reflection characteristics beside the well, and establishes the correspondence between different sedimentary facies types and seismic facies of the Fengcheng Formation, seismic phase boundary recognition method based on frequency division reconstruction and waveform classification, pointed out the plane distribution range of the main seismic facies of the Fengcheng Formation, and predicted the distribution characteristics of the main sedimentary facies belt of the Fengcheng Formation based on the paleo-geomorphology. The extracted seismic facies have strong planar distribution regularity and high degree of conformity with the downhole sedimentary facies and lithology. It can reflect the planar distribution regularity of the Fengcheng Formation sedimentary facies in the Mahu area. The fan delta plain-inner front subfacies glutenite is mainly distributed in the western, southern and northern margins of the Mahu Sag, the subfacies dolomitic sandstones at the outer front of the fan delta are mainly distributed in the lower slope area, and are distributed in contiguous areas. The sag area is a wide range of shallow lake-semi-deep lacustrine mudstones, dolomitic rocks and argillaceous shale distribution areas, which point out the direction for the next step in the exploration area of multiple types of oil and gas reservoirs in the Fengcheng Formation in the Mahu area.
Xueyong WANG, Baoli BIAN, Hailei LIU, Zhongfa JIANG, Lu ZHOU, Yongcai ZHU . Seismic facies characteristics and distribution of sedimentary facies of Permian Fengcheng Formation in Mahu area, Junggar Basin[J]. Natural Gas Geoscience, 2022 , 33(5) : 693 -707 . DOI: 10.11764/j.issn.1672-1926.2022.01.014
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