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Sequence stratigraphy 's control on diagenesis and its mechanisms
HAN Rubing1, TIAN Changbing1, SUN Haihang2, WANG Peijun2, XU Huaimin3, LI Weilu3
(1.Research institute of petroleum exploration and development, Beijing 100083, China;2.Tarim Oilfield Corporation, PetroChina, Korla 841000, China;3.College of Geosciences in China University of Petroleum, Beijing 102249, China)
Abstract:
With a comprehensive use of multiple data and calculation method of porosity evolution, the mechanisms and differences in diagenesis characteristics of sequence stratigraphy framework were studied. The results show that the differences in diagenesis include sequence boundary level and sequence unit level. Sequence boundary has strong effects on cementation and dissolution. Compared with the sequence unit, the content of cements and degree of dissolution near sequence boundary are significantly higher. For the sequence units, the sequence framework controls the sedimentary environment and characteristics of the sediments. After diagenesis, the strength of compaction, cementation and dissolution of each sequence unit may be different. For compaction, the sequence framework controls the characteristics of the sediments, such as grain sorting and composition. The strength of compaction of early transgressive system tract (E-TST) and early high stand system tract (E-HST) is higher than late transgressive system tract (L-TST). For cementation, the sequence framework controls the geochemical characteristics of the pore water, the source of calcium and the distribution of feldspar, and the content of cements of E-HST, E-TST and L-TST decreased in sequence. For dissolution, the sequence framework controls the geochemical characteristics of the pore water and the source of cements, and the degree of dissolution of L-TST, E-TST and E-HST increases in sequence.
Key words:  sequence stratigraphy  diagenesis  Donghe sandstone  sequence boundary  sequence unit